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so, I’m wanting to put in 410 gears front and back with a Detroit truetrac locker in the rear. I have a Chrysler 8.25 rear axle w 3.55 gearing according to the build sheet, and a Dana 30 up front. Can someone guide me through exactly what I’m going to need to order as far as parts? I plan on tackling the work myself and I’m clear on tools and stuff just not quite clear on parts to order. Do I need to know the spline count on the 8 1/4? And how do I know if I need a reverse cut gear up front?
What year is it? I want to say 97 and up have 29 spline 8.25’s you can buy “master install kits” the cheapest deal I’ve seen by far is RWK Hays Supply. What size tires ?
so, I’m wanting to put in 410 gears front and back with a Detroit truetrac locker in the rear. I have a Chrysler 8.25 rear axle w 3.55 gearing according to the build sheet, and a Dana 30 up front. Can someone guide me through exactly what I’m going to need to order as far as parts? I plan on tackling the work myself and I’m clear on tools and stuff just not quite clear on parts to order. Do I need to know the spline count on the 8 1/4? And how do I know if I need a reverse cut gear up front?
First, there is a Detroit Locker and a Detroit Truetrac, they are not the same thing so be sure you are getting the right one when you order. For the rear since yours is a 2001 if your axle is factory then it is a 29 spline Chrysler 8.25, you will need to make sure whenever you order your Detroit Locker, or Truetrac that it is the 29 spline version, the install kit comes with everything you need but I recommend getting an extra pinion bearing so you can grind the center out of it to make a setup bearing so you can easily remove it to adjust the shims to set your pinion depth. Also you will need to buy or make the tool to for the carrier side adjusters, another thing to remember is the ring gear bolts on the 8.25 are reverse threaded.
Your front axle is a low pinion Dana 30 that uses standard cut gears. In addition to what comes with the install kit you will need a new carrier for 3.73 or lower (numerically higher) gears, and two extra carrier bearings to make setup bearings so you can adjust the backlash easier since the Dana 30 uses inboard carrier shims. http://rwkhaussupply.com/jeep-specif...r-package.html
Thanks monkey and 444... def helped clear it all up for me...as for the tool for the carrier side adjusters,, can I weld a socket on a piece of pipe? What size socket?
Thanks monkey and 444... def helped clear it all up for me...as for the tool for the carrier side adjusters,, can I weld a socket on a piece of pipe? What size socket?
Yes that's what I did, I think it was a 36mm nut and I welded a bolt in at the other end to put a socket on.
I have a 91 with AW4 on 32s and just did this. Went to 4.56s and would recommend that also if you plan on going bigger on tires. I did the TruTrac in the rear (CRY 8.25) and upgraded to 29 spline (older Cry 8.25 were 27 spline) and chromoly axels. The front I had to swap the carrier since I was going over 3.73 (Dana 30 HP so gears are reverse cut). Put in a 42 tooth speedo gear and checked with GPS and now my speedometer is spot on. If your going through all this just got to 4.56. I spend a lot of time on the highway as well and its not to bad.
Everyone’s got a first time ... and thanks for the comment about 456, I’m considering it, more punch would be nice just didn’t want too high rpm on highway
If you're asking these kind of questions, performing a gear install might not be the wisest decision.
I agree completely. I paid to have my work done simply because parts cost more than install. I have a 41 coup I am working on and I will do the gears on that myself since its only 1 axel.
On the 4.56s with my tires 32s (measure at 31.75ish) at 65 MPH im turning about 2300 rpm so its not to bad over stock I was around 2000 rpm at 65 with 28 inch tires.
Last edited by Bullstang360; Mar 2, 2018 at 11:39 AM.
It doesn’t seem that complicated, I mean using a dial indicator and adjusting a couple sets of shims to get a good cut pattern seems like it may be tedious but it doesn’t seem crazy difficult. I’m going to make the setup bearings so I can easily adjust everything. Honestly, I would rather set it up myself so I know it’s done right lol
Lockers and gears question
