|
Hopefully will be doing this over the winter. The steering box is the XJ has been leaking for about a year now, so it's time to UPGRADE.
|
Just to let you all know you can also use the J20 steering box, it has the same valving that the PSC after market box has.... And there cheep to buy new...
|
4.6L Stroker write-up
Disclaimer: I do not recommend nor endorse any of the modifications shown in this article; the information is provided for personal information purposes only. I am not an Engineer, metallurgist, or mechanic - I have absolutely no professional qualifications whatsoever in this regard - I have simply collected information from others and from my own experience. Use of any of the information contained herein is at your own risk. It is therefore your responsibility to maintain safety in and around your vehicle at all times. It is likely that some procedures featured here may void your vehicle’s (or parts thereof) warranty. It is also likely that some of the information featured shows procedures that may not be legal for street use in some or all states within the US and/or any other countries and may not be safe for on or off-road use. The article's author, or anyone related to this web page, cannot be held responsible for any damage, failure, or violations of the law, that might result from the use of any information contained on this page, or linked to on this page.
So I’ve noticed a lot of people lately having power issues with their 4.0 and considering serious engine modifications. Aside from bolt-ons (which can give you some more power but usually isn’t enough to turn those bigger tires) you’re left with two options : doing an engine swap like a Chevy 350, AMC 5.2 or 5.9, or any other engine or stroking. While the 350 is a very tried and true selection and possibly the most common sb v8 with the most aftermarket support, it requires a lot of other modifications, such as motor mounts, transmission, computers, wiring, etc. and becomes a mess. If your jeep is not a DD this would be a good swap to do, but it is going to take some downtime to do. It also requires a good bit of money, considering all of the parts you have to buy beyond the engine. If you buy a junkyard motor you also run the risk of finding one that needs a total rebuild, which is another costly thing. The 318 and 360 are good swaps to do, because they did come in grands so you can just find a junkyard 5.2 or 5.9 and take all the parts you need (or head over to the dealer). A little less fabrication is needed here – yet you still do need all of the extra parts. With a stroker the only thing that changes is the internals of the engine. You retain all of your stock sensors, harnesses, transmission, etc. etc. In a nutshell stroking is simply putting in a larger crankshaft, smaller rods, and doing an overbore. This combination results in a larger displacement. The most common strokers are the of the 4.5-4.7 variety (4.6 possibly the single most common) and use the crank and rods from the AMC 4.2L inline 6. A stock pin height piston is used with your selected overbore. The bore you choose is dependent on the shape of the motor and your preference on displacement. This write-up will focus on the 4.6 variety, as that is what I built. I am estimating 240 HP and 335 ftlb (only 5 hp and 10 ftlb less than the 5.9). I have yet to do a dyno run; however that is soon to come. A well build stroker with ported heads, all accessories, and the right cam can achieve 260 HP and 325 ftlb, however this is a little beyond the scope of the average “budget” stroker. Before you begin any work on your own stroker, I highly suggest you read over the information here, as well as Dino’s site, and the FSM’s engine overhauling section many times. You cannot know too much information when it comes to building an engine. Factory Service Manuals can be purchased from Dirk (Cue) very cheap, in .pdf format on a CD. I printed out the engine pages and blow up diagrams located in the parts diagrams, I found this information to be VERY handy while working on the engine. The FSM provides very detailed information, highly accurate diagrams, and all the torque and other specifications you’d ever need to know to build an engine. No mechanic should be without one. First I’ll describe a little bit about my stroker. I use the 4.2 crank and rods from an 89 YJ, because the snout length on the crank matches the snout length of the 4.0 crank (I’ll discuss this further later on in the write-up). I am currently using the sealed power 677P pistons with a .030” overbore. I was going to use the H802CP pistons, however the factory sent me the wrong bore size and in the name of getting the stroker built quickly I went with the pistons I had on hand. I am using a sealed power RV cam with the following specs: Duration: 208/208 degrees @ 0.050" lift Lift: 0.448"/0.448" Lobe separation angle: 110 degrees Nothing too crazy, however it gives a good amount of low end torque, which is desired for off-road driving. I did a port and polish in my garage using a die grinder and the standard abrasives port & polish kit (which will be discussed later also) and used the 5.9 performance valve springs. My head was decked .017” a year before due to overheating and warping, I liked this number so I reused the head. The result of my decked head and higher performance pistons is a healthy 9.5:1 compression ratio. Had I used the H802CP pistons I originally wanted, I would have been looking at a 9.8:1 CR. This means I have to run on 93 octane gas, but it only ends up being 2 or 3 dollars more per fill-up. I’m using a borla longtube header for maximum low end torque. It is perhaps the most expensive header, but also happens to be the most powerful and has an excellent warranty. Now for the more general tech: First I’ll discuss the crankshaft. The crankshaft used in a 4.6L stroker is the AMC 4.2L crankshaft. This crankshaft shares the same size and location for the main bearings, which means it bolts directly in. The following casting numbers and details are found on Dino’s site (http://www.angelfire.com/my/fan/selection.html) Year.........Casting No......Description 1971.........3199738.........For Borg Warner automatic 1972-80...3214723.........12 counterweights, 66lb, 64mm nose 1981-86...3235477.........4 counterweights, 46lb, 64mm nose 1987-90...3727...............4 counterweights, 46lb, 54mm nose For comparison, the 4.0 crankshaft has 8 counterweights, weighs 55lb, and has a 54mm nose. The #3214723 crank is reputed to the the strongest. The extra counterweights dampen vibration-inducing harmonics to produce a smoother running engine. The 12 CW crank has more rotating m**** which means it is harder to slow down – which makes it more resistant to stalling. While this is desired, the 4.6L stroker is fuel injected and thus stalling out is not as much of an issue. The 87-90 crankshaft is the easiest to work with because it has the same nose length as the 4.0 crankshaft. In order to use the 71-86 crankshafts, a 1cm spacer has to be machined and put on the nose in order to get the harmonic dampner pulley located in the right spot. Because of this reason, I chose the 89 crankshaft. I purchased my crankshaft from advance auto parts. It was more expensive than the junkyard route, however it came to me remanufactured – meaning it came with the correct dimensions, matching main bearings, and even cam bearings. The main girdle located on 96+ 4.0 engines is a good thing to have, it ties together all of the main caps – thus providing more rigidity and decreasing noises/vibrations. Using this girdle requires the main bolts from a 96+ 4.0, as it has the stud on top of the bolt that the girdle rests and bolts onto. The main caps that came with the block can be reused, however because the 4.2 crankshaft is larger than the 4.0 crankshaft, the girdle has to be shimmed up to clear the larger crankshaft. To do so, simply put 2x 3/8” washers in-between the main cap and girdle. There will be just enough thread left on the bolt to safely secure the girdle down. These can be bolted down to stock specification. The stock oil pump can be re-used, but my oil pump was already 128K miles old. I decided to go ahead and replace the oil pump while I had everything out. Instead of going with the simple stock oil pump I wanted a little more flow, so I got the high volume oil pump from advance auto parts. When installing the oil pump, I recommend removing the access plate and packing the pump full of Vaseline. This provides more suction and instantly gets oil pumped to the rest of the engine on initial startup, rather than having a few seconds of dry running which can cause undesired damage. Instead of this you can also use a drill to turn the oil pump before starting to get oil pumped through, or buy a pre-oiler (which is most desired, but again isn’t the best option for a budget build… a pre-oiler can always be installed later on if desired). The rods from the AMC 4.2L I6 are used, as it has the same pin bore as the 4.0 (which allows for the stock type 4.0 piston to be used) and fits perfectly (obviously) on the 4.2L crankshaft. The piston you use is up to you, every piston has different pin heights and dish volumes. The following part number and information are also pulled from Dino’s site: Stock 4.0 cast aluminum '87-'93 #83500251, '94-'95 #4773157, '96-'04 #4798329----1.601" 13.1cc Keith-Black Silvolite hypereutectic #2228----1.581" 11.5cc Sealed Power hypereutectic H802CP----1.592" 15.8cc Sealed Power cast aluminum 677P----1.585" 17.5cc The smaller the dish volume you have, the smaller the combustion chamber, and thus the higher the compression ratio. If you get the 677P pistons like I did, the part numbers for the rings are: SLP-E-245K030 is the part number for moly Sealed Power rings, a set of 8 @ 50 bucks SLP-WE-245K-30 is the part number for the same ring, only in a single piston set @ 15 bucks TSR-S0660-30 is the part number for the Total Seal ring. It has a gapless 2nd ring and I would highly recommend it for anybody who has the extra money to throw down, they're 150 for a set of 8. The land sizes on the 677P are 5/64 5/64 3/16. I highly recommend the total seal rings if you can afford the extra 100 bucks. Total Seal is a much better ring, and reduces blow-by and provides a much better seal. Camshaft choice is another important aspect of the stroker build. If you are going with the absolute low buck stroker you can re-use the stock camshaft, but only with a compression ratio up to about 9.1. Anything above that has too high cylinder pressures and can cause detonation. A list of camshaft specs is found on Dino’s site http://www.angelfire.com/my/fan/Jeep4.0Camshafts.htm. The cam you choose can either give you lots of low end torque but low HP, or high HP and not as much lower end torque. If your jeep doesn’t see much insane offroading that often and is a solid DD, you may want to consider a camshaft with specs in-between to give you enough power on the road as well as on the rocks, or if you spend a lot of time in the mud and require power throughout the rpm band. The timing set from the 4.0 engine will work just fine, however you may choose to upgrade to a dual roller timing set. The stock distributor will work, as well. However some modification of the distributor is required when putting in an aftermarket cam. The tabs on the distributor must be cut off, as the distributor will not align the same as with the stock cam. This is due to a slight difference in the gearing of the cam. No worries, however, as the clamping action of the retainer and bolt is sufficient to hold the distributor from rotating during usage. I have 2,000 miles on my stroker and it hasn't budged, Aaron Clements has 10K on his and reports the same thing. The cylinder head is the final consideration for the stroker. The intake valve on the 4.0 is 1.91” and the exhaust is 1.50”. The following casting numbers are again thanks to Dino: Year............Casting No 1987-90......2686 1991-95......7120 1996-98......0630 1999-04......0331 As a matter of fact, I’ll just copy the following paragraph from Dino, as I cannot write it any better. The early '87-'90 non-HO heads have low intake ports that flow rather poorly. The later HO heads have higher intake ports that flow more air by allowing a straighter shot into the cylinders. The '91-'95 HO heads with casting no. 7120 have the highest intake and exhaust port airflows, especially at lower valve lifts where it is most important, and are the best for performance. The '96-'98 0630 heads are almost identical except that they don't have a port for the coolant temp. gauge sending unit. The '99 and later WJ heads with casting no. 0331 have smaller exhaust ports to produce a faster warm-up of the catalytic converter and improve emissions, but performance also suffers because the ports don't flow as well as those of the 7120 and 0630 castings. The 0331 heads are also prone to crack if the engine overheats so these should preferably be avoided. All of the 4.0 heads respond well to a good port job, with gains of up to 20hp possible on a 4.6L stroker engine. As far as fuel is concerned, almost all stock fuel delivery components are used, excepting the fuel injectors and possibly the MAP sensor. Most people use 24# FMS injectors found most commonly on mustangs. These injectors are easily identifiable by their blue color. |
Term Dictionary.....Add more if you see missing
231-(see NP231)
242-(see NP242) 249-(see NP249) 35C-(see DANA35C) 45RFE-automatic transmission in the V8 WJ 8.25-Chrysler 8.25" axle found in XJ rears) 8.8-Ford 8.8" axle (Ford Explorers, good aftermarket replacement for those seeking disc brakes and a stronger axle than the 44) 9"-Ford 9" axle (late model version was very strong) ARB-A company based in Australia that produces popular winch-compatible bull bars and differential air lockers. AFU-All F---ed Up AT (A/T)-all terrain (all terrain tread) tire ATF-Automatic Transmission Fluid ATKO-BF Goodrich all terrain tire AW4-the automatic transmission used on the XJ since 1987 AX15-5 speed manual stick in a pre-99 6 cylinder TJ AX5-5 speed manual stick in a pre-99 4 cylinder TJ BB-Budget Boost. An inexpensive, popular 2" lift used by many Jeepers. BFG-BF Goodrich tires BFH-Big F-cking Hammer BL-body lift BS or Back Spacing. backspacing, distnace from the mounting flange of a wheel to the inner edge (rim) of the wheel. i.e. larger BS will cause the wheel to sit "into the fender" more, smaller BS will cause the wheel to "stick out" more. Absolutely necessary to determine proper wheel and tire combination BTT-back to top BTW-by the way C101-Bulkhead plug for wiring on Renix Jeeps CAI-Cold Air Intake CAT-catayltic converter CB-citizen band radio CJ-Jeep Wrangler's Older Model Years. "Civilian Jeep" CJ-2A-Civilian version of the MB, split windshield CJ-3A-Updated version, single pane windshield CJ-3B-High hood version of 3A to fit larger engine CJ-5-Early years were 81" wheelbase, later years were ~84". Built until 1983. CJ-6-Stretch version of CJ-5, 101" wheelbase CJ-7-smilar to late CJ-5, but with ~94" wheelbase. Built until 1986. CJ-8-Scrambler Pickup, stretch version of the CJ-7, 104" wheelbase. CJ-10-somewhat rare here in the U.S. Heavy Duty Truck. D30 (D30r)-(see DANA30) D44 (D44i)-iron Dana 44 axle (TJs) D44a(see D44) but with aluminum housing (V8 ZJs and WJs) D60-(see DANA60) DANA30 (DANA30r)-front axle (r = reverse cut) All modern Jeeps DANA35C-axle (YJs, ZJ, WJs, TJs) DANA60-axle (very strong) DC-Daimer Chrysler DJ-Postal Jeeps, usually 2wd DW-death wobble. Side to side movement of the front axle that causes the Jeep to shake violently. Most common on lifted ZJ's before a wheel alignment has been done. Can be caused by worn steering stabilizer, improper wheel alignment, or worn front suspension components. ECU-Engine Control Unit (same as PCM). Very popular mod. Common one made by Mopar. EFI-electronic fuel injection F2R-front to rear swap lift FAQ-frequently asked questions FC150/170-Forward Control Cabover trucks FIPK-(see K&N FIPK) FM-FlowMaster muffler FSJ-Full Size Jeep (SJ's and J-trucks). FSM-field service manual FUBAR-F---ed Up Beyond All Recognition FWIW-"For what it's worth..." GC-Grand Cherokee GPW-Willy MB built by Ford GS-Grand Slam (what is this???) GSE-Grand Slam East (what is this???) HO-High Output. New engine option for WJs HP-high pinion. Usually accompanied by RC gears - the pinion enters the differential higher, which allows for better driveline angles. HTH-hope this helps IAC-idle air controller ICE-This flashes on overhead display when the temperature is below 32 degrees IFS-independent front suspension IIRC- If I Recall Correctly IMHO-"In my honest opinion..." IMO-"In my opinion..." IRS-independent rear suspension JC-Jeep chick JGC-Jeep Grand Cherokee JU-Jeeps Unlimited K&N FIPK-Fuel Injection Performance Kit refers to an air intake kit from K&N KJ-Jeep Liberty All Model Years KOLAK-maker of good aftermarket parts LA-Long arm LCA-lower control arm LMFAO-"Laughing my f---ing a-- off!" LOL-"Laughing out loud" LOM-lamp outage module LSD-limited slip differential LWB-long wheel base M170-Military CJ-6 with wider passenger door opening for abulance duty. M38A1-Military version of the CJ-5 MA-Willys SWB 4x4 built under govt contract. MAF-mass air flow sensor. Measures airflow coming into your engine in front of the throttlebody. Uses a form of resistor that is cooled by the air passing by it and mathematically determines the "mass" of the air coming into the engine. These are traditionally bottle necks for heavy breathing engines as they often have a screen in them to protect the measuring element. There are many different designs and high performance large capacity ones out there. These are a big headache for GM owners but Jeep has stayed with MAP MAP-manfold absolute pressure. A sensor that tells the computer how much air is flowing into your engine. Eliminates the need for a MAF sensor but is less responsive than one. MB-The MA was quickly replaced with the MB... used throughout WWII. MT (M/T)-Mud terrain (mud tread) tire MTR-Goodyear mud terrain tire NP231-Command-trac transfer case (2H, 4H, N, 4L) NP242-Selec-trac transfer case (2H, 4PT, 4FT, N, 4L) NP249-Quadra-trac transfer case (4H, N, 4L) NV3550-5 speed manual stick in a post-99 6 cylinder TJ NVRnoise vibration harsness NYWD-No you will die! OBA-on board air OBC-on board computer OBDII-on board-diagnostics OEM-Original Equipment (standard equipment on our vehicles like it came from the factory) OHC-Overhead console OME-A manufacturer of small lifts and shocks and steering stabilizers. Their SD40 steering stabilizer is very popular. O/T (OT)-off topic PCM-Performance Control Module (same as ECU) POS-Piece of sh-t PSI-pounds per square inch QD-quick disconnect QD-Quadradrive QT-Quadra-Trac RA-Road Armor RC-reverse cut. This is a ring and pinion set with the helix on the gears cut in the opposite direction to normal. It allows the pinion to enter the differential higher up in the casing, and, when used in the front differential, makes use of the stronger side of the ring gear when moving forward. RE-Rubicon Express ROTFLMAO-"Rolling on the floor, laughing my a-- off" RR-rock rails S4W-4" Lift made by teraflex for '99-current Grand Cherokees SAE-standard american equivalent SAS-solid axle swap. Taking out the crappy IFS (ala Liberty) and replacing with something you can 'wheel on. SFA-solid front axle SJ-Early Full size Wagonneers, Grand Wagoneers and Cherokees. SNAFU-"Situation normal. All f---ed up" SOA-spring over axle. A popular conversion for Jeeps with leaf springs. You take the spring from under the axle, and remount it on top. SRA-solid rear axle SWB-short wheel base SYE-slip yoke eliminator. A kit used mostly in 231 transfer cases to shorten the rear output shaft TB-throttle body TB-track bar. that positions and centers the axle (front or rear) relative to the body. TC-transfer case TC-torque converter Tera-Teraflex. Maker of Jeep products including lifts TJ-Jeep Wrangler's Model Years 1997-Present TPS-throttle position sensor TQ-torque converter TR-trail ready TSB-technical service bulleten TSi-TSi package, a package offered on Grand Cherokees from TSL-triple stage lug (as in ss tread pattern) TV Cable-Throttle valve cable (controls shift points) UC-Up Country package, a package offered on Grand Cherokees from UCA-upper control arm VIC-vehicle information center VC-vicuous coupling. Method of coupling front and rear driveshafts together in 249 transfercase while in highrange and offers differentiation between the two. 96-98 models bypass this and lock in low range WAG-wild a-- guess WFO-Wide F---ing Open (Full Throttle) WOT-wide open throttle WJ-Jeep Grand Cherokee's Model Years 1999-Present WTF-"What the f---!" XC-transfer case XJ-Jeep Cherokee's 1984 - Present YJ-Wrangler 1987 - 1995. Exact same wheelbase as CJ-7... square headlights ZJ-Jeep Grand Cherokee's Model Years 1993-1998 |
Originally Posted by nick_n_ii
(Post 74844)
Just to let you all know you can also use the J20 steering box, it has the same valving that the PSC after market box has.... And there cheep to buy new...
|
Ya, it has 4 bolt holes and if I remember right the XJ only has 3. you can either use just 3 or drill the fourth hole for more strength....
|
Great info threads in here...
In here is links and write ups of very useful info..
|
Tire Siping
Info on tire siping.
http://www.discounttire.com/dtcs/tireSiping.dos |
How to diagnose problems:
This is information about the jeep engine and how to diagnose for problems. It is based off of the 1988 jeep computer controlled systems. It gives information on everything needed to test every sesnsor and switch as well wiring diagrams and diagnostics. It is very useful!
http://jeepgarage.free.fr/OWN/4.0l%20cec%20system.pdf here is the root menu of everything: http://jeepgarage.free.fr/OWN/ |
Hey!
Thanks for the info.
|
|
Hi BlueXJ. I think those codes are very useful for me. Thanks for posting it here. :D
|
Originally Posted by muddeprived
(Post 74828)
Perfect for those who need to know what backspacing they have. :thumbsup:
|
Originally Posted by nick_n_ii
(Post 74824)
More Info on Transfer Cases
# Chevy/GM New Process 203 This isn't a bad transfer case, but it could be better. Like other chain drive units, the 203 is susceptible to chain stretch, but it won't stretch easily. The low gear ratio is a not the best at 1.98:1. This unit has a right-hand drop. This transfer case, which was produced from 1971 to at least 1980, is a full time unit. There are kits available from various manufacturers to turn this transfer case into a part-time unit. Like the other New Process transfer cases listed here, there's also Dodge and Ford versions of this unit. # Chevy/GM New Process 205 This very strong cast iron case has all gear construction. It first came out around 1971, and lasted at least until 1990. It was available in both married and divorced styles, both of which had a right-hand drop. The low gear ratio isn't the best at only 1.98:1. # Dodge New Process 203 This isn't a bad transfer case, but it could be better. This chain drive unit is susceptible to chain stretch, but it takes a lot of abuse to do that. The gear ratio is a not-so-great 1.98:1 and a right-hand drop. This transfer case, which was produced from 1971 to around 1980, is a full time unit. However, there are kits available from various manufacturers to turn this unit into a part-time transfer case. # Dodge New Process 205 This is possibly the strongest transfer case ever put in Dodge light trucks, with its all gear construction in a cast iron case. It first came out around 1971, and lasted at least until 1980. It was available in both married and divorced styles, both of which had a right-hand drop for the front driveshaft. The low gear ratio isn't the best at only 1.98:1. # Ford Dana 20 The Ford Dana 20 was produced from 1966 to 1977, and was used in the early style Bronco. Some appear to have made it into a few 1/2 ton (F-100) trucks, but this was not a standard. The very early 1966 model used a different shifter than the standard T and J shifters of the later transfer cases. From 1966 to mid 1973, the T shifter case was used. After that, the J shifter type was used. The J shifter type uses a shift pattern that looks like a backwards J. The T shifter uses a straight pattern, as does the early shifter. The early shifter (very rare) is rather hard to change gears with, and thus Ford/Dana changed the design. The Ford Dana 20 design has a centered rear output, left-hand front output, and an all-gear design (read this as "strong and hard to break"). The case is made of cast iron, and a sheetmetal plate covers the bottom. This transfer case has two shift rails, one for low, neutral, and high on the front output, and one for low, neutral, and high on the rear output. A pair of metal lockout pins (or "pills") in tubes drilled between the holes for the rails work in conjuction with slots cut in the sides of the rails to provide only the gearing combinations of 2 high, 4 high, neutral, and 2 low. (These are put together by rear high/front neutral, rear high/front high, rear neutral/front neutral, and rear low/front low, respectively.) A linkage piece connects to the end of both shift rails, and then to a shift lever. This linkage rocks back and forth when the lever is moved, as the rails and lockout pins control the rail movement. The high range gear ratio is a straight 1:1, while the low range gear ratio is 2.48:1. Twin-shifter setups on this transfer case put a shift lever on each shift rail. Most also recommend/require the removal of the lockout pins. This allows for some new gearing combinations, but the driver needs to be careful. The rear low/front neutral is sometimes nice and is the gear combination that most folks are after. If something's happened in the rear of the rig, the front high/rear neutral or front low/rear neutral might be useful. The gear combinations to avoid are rear high/front low and rear low/front high. If all four wheels have traction, these last two gear combinations will either kill the engine (at best), or break something in the drivetrain. # Ford Dana 21 Definitely not one of Ford's better ideas, this was a single-speed transfer case (in other words, it has two high, neutral, and four high). This transfer case was used only in in some 1969 to 1976 F-100's. Its spline count and bolt pattern differ from the standard Ford stuff. The case on this unit is notorious for flexing and breaking gears and shafts. Parts are hard to find. This transfer case also uses a different input spline and bolt face that the rest of the Ford stuff. I'd recommend avoiding this transfer case; for less bucks and less trouble, there's better options. # Ford Dana 24 This is a fairly uncommon transfer case. It's a two-speed, divorce-mounted transfer case that was used from 1960 to 1973. If you've got one of these, and it starts having problems, most likely it's the bearings. Some folks have a very high opinion of this unit, and others think that upon its breaking, it would probably be easier to replace the Dana 24 with a divorce mounted NP205 than to find parts for it. # Ford New Process 203 This isn't a bad transfer case, but it could be better. It's a chain drive unit, so it is susceptible to chain stretch, but it takes a lot of abuse to do that. The gear ratio is a not-so-great 1.98:1, but it does have the Ford standard input and left-hand drop. This transfer case, which was produced from 1971 to 1980, is a full time unit. There are, however, kits available from various manufacturers to turn this unit into a part-time transfer case. # Ford New Process 205 This is the ultimate beef for a light truck transfer case. It first came out around 1971, and lasted at least until 1980. The Ford version uses the standard Ford input and a left-hand drop for the front output. It's of an all gear design, with a cast iron case. The low gear ratio suffers a bit at being only 1.98:1. This unit will not be the weak link in your drivetrain. # Ford New Process 208 The 208 is an aluminum cased, chain driven unit. It has the standard Ford input and left-hand drop. This unit has a nice low range ratio, at 2.72:1. This transfer case was supposedly used from 1980 to about 1982 (when the Borg Warner transfer cases supposedly took over), but I've got one of these in my 1984 Bronco. # Ford Borg Warner 1345 This transfer case is chain driven, and has an aluminum case. It's pretty similar to the NP208 in those respects, as well as the fact that it has the same 2.72:1 low-range ratio. Ford started using this in 1980, and discontinued its use in 1988, when it was replaced with the BW 1356. # Ford Borg Warner 1356 The 1356 was first used in 1988 or 1989, replacing the BW 1345. Like its predecessor, it's chain driven. However, it has a stronger, magnesium case. |
Correct gear ratio for tire size chat
|
| All times are GMT -5. The time now is 07:35 PM. |
© 2024 MH Sub I, LLC dba Internet Brands