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rear differential ratio question, jeep xj 88 dana 35c swap with.. ?
hey jeepers,
first of all im just trying to get more information on this issue i do not yet have to replace it but will in near future. trying to figure out what to keep my eye out for exactly like which ratio specially.
ok i have an xj 88 with dana 35c non c-clip and its not in a very good shape by the sound of it, im still in doubt if even to replace whole axle or have the differential rebuild since ive put quite a few dollars already into this axle. new brakes and hardware also axle seals in and outers plus wheel bearings. i do believe the one i have now is 27 spline.
ive done some research and seen people mention a Dana 44 or 44a? or a 8.25? (ford?)
see this is where it gets confusing to me how would i know what kind of ratio to look for so when i do run into a good axle for a nice price i would know right away to buy it or not so it would be a easy swap.
The most popular axles people choose to upgrade to are:
Chrysler 8.25 (29 spline, bolt in, cheap at most junkyards, parts are easy to find)
Ford 8.8 (Disk brakes, usually 4.10 gears, LSD)
GM 14 bolt(strong and easy to acquire)
The most popular axles people choose to upgrade to are: Chrysler 8.25 (29 spline, bolt in, cheap at most junkyards, parts are easy to find) Ford 8.8 (Disk brakes, usually 4.10 gears, LSD) GM 14 bolt(strong and easy to acquire)
those GM 14 bolts are way too wide for stock usage.
chrysler 8.25 29 spline bolt in - is this just un bolt and bolt in swap and i dont have to worry about ratio here ? i have a dana 30 in the front.
ford 8.8 - the disc brake conversion sounds interesting same question here 4.10 gear ratio would be a perfect swap no messing with gears ?
gm 14 bolt - i do have an xj 88 pretty much stock no lift nothing just add-a-leaf
thanks shooptube for your fast reply, chrysler 8.25 29 spline bolt in - is this just un bolt and bolt in swap and i dont have to worry about ratio here ? i have a dana 30 in the front. ford 8.8 - the disc brake conversion sounds interesting same question here 4.10 gear ratio would be a perfect swap no messing with gears ? gm 14 bolt - i do have an xj 88 pretty much stock no lift nothing just add-a-leaf thank you too xjwonders. marc
yes it's pretty much just bolt in, only if you pick up the one that match the ratio in the front.
4.0 with automatic transmission would have 3.55 ratio
4.0 with manual transmission would have 3.07 ratio.
xjwonders,
i do have an automatic transmission so this verifies i have an 3.55 ratio.
this then means the front and rear axles are both 3.55 ?
im sorry for these question but im trying to understand this so i wont have any surprises cause this is my daily driver. i can do 8 hrs jobs on it but needs to be patched up for the next day drive.
The Chrysler 8.25 is a direct bolt in. The only thing I could think of other than different gears would be driveshaft length but I think the D35 used the same length shaft.
Does your jeep have a trailer hitch and transmission cooler? That would mean you may have the factory tow package which give you 3.73 gears instead of the normal 3.55.
Also, I didn't realize you were keeping it stock and yeah the 14 bolt is way to wide for everyday use, my apologies.
The Chrysler 8.25 is a direct bolt in. The only thing I could think of other than different gears would be driveshaft length but I think the D35 used the same length shaft. Does your jeep have a trailer hitch and transmission cooler? That would mean you may have the factory tow package which give you 3.73 gears instead of the normal 3.55. Also, I didn't realize you were keeping it stock and yeah the 14 bolt is way to wide for everyday use, my apologies.
you are correct but having those doesn't necessarily mean it's a 3.73. That had to be a factory option. Some hitches and trans coolers are aftermarket.
Best way is to pop the cover off the axle and verify
97 and up automatic xj with 8.25 would be what you are looking for. but you would also need the drive shaft and spring plates, along with new u-bolts and possibly new parking brake cables.
or you can look for a d44 (not d44a) out of early (1987) xj. also need rear shaft and spring plates along with new u-bolts.
you will need new u-bolts regardless if you are changing axles.
ford 8.8 is a good swap, but requires welding a fab work to fit. and again, drive shaft, u-bolts and definitely parking brake cables. also, it's a bit shorter, so wheel spacers or offset rims would be needed.
anything else would require same amount of fab work as the 8.8.
8.25 would be the easiest, as there are plenty around for cheap.
you are correct but having those doesn't necessarily mean it's a 3.73. That had to be a factory option. Some hitches and trans coolers are aftermarket.
That's why I said you may have, not that you will have
Also you could try looking to see if there is a tag on the front or rear axle attached to one of the bolts that has the ratio stamped into it but a 1988 is pretty old
shooptube,
alright gm 14 is out of the question then,
the jeep has a trailer hitch indeed and also a small extra transmission cooler sitting in front of the radiator tho when replacing the rear brake pads i did not have the 10inch but the smaller once 9inch pads, which of what i understood 10inch would be the upgraded towing packages.
xjwonders,
take the drive shaft also, good tip thanks!
i had the differential cover off and it is an open differential no limited slip, if that helps. not sure what you mean with pop the axle covers to meassure the brake pads ?
caged,
welding is pretty much out of the question i dont have that option that would mean the only axle left for easy swap would be Chrysler 8.25 and changing parking brake cables shouldnt be a problem. question what is a spring plate ? (leaf spring ?)
so im looking for a Chrysler 8.25 with a gear ratio of 3.55 or am i still confused.. ?
He means you should count the teeth on the ring and pinion or look up the part number to find out your gear ratio. The only Jeeps that got 10" drums are ones equipped with the heavy duty brake package but I don't know if that was a requirement of the tow package.
If welding is out, then either a chry8.25 or factory d44 but those are hard to find.
09-06-2016, 08:33 PM
rear differential ratio question, jeep xj 88 dana 35c swap with.. ?
