Originally Posted by roninofako

2.5l 4 cylinder with the V6 manual transmission....from the wiki page:

Jeep XJs came in several standard gearing ratios:

3.07:1, manual transmission, I6 engine.
3.54:1, automatic transmission, I6 engine with Dana 44 rear differential
3.54:1, manual transmission, I4 engine with Dana 35 rear differential
3.55:1, automatic transmission, I6, V6 engines; manual transmission, I4 engine
3.73:1, automatic transmission, I6, tow package, UpCountry package, 2.5 VM diesel manual
4.10:1, 2.5L I4 engine, V6 manual transmission
4.56:1, automatic transmission, I4, offroad or tow package

Originally Posted by Jeep Driver

That's wiki for ya.........

It's and AX5 trans............>>NOT a v6 trans.

Originally Posted by Fred/N0AZZ

I can one of your questions very quickly and easy. YES change the gears to a 4.56 ratio that is the correct setup for a 33" tire and can be ran with a 35". I run both sizes on 2 sets of wheels on mine with 4.56's, my 35's are for off road only the 33's serve as both on and off road.


Your going to have and change gears in the front also so might as well do both with the correct gear. I bought my 4.56's from Rustys for my 8.25/D30 with both master install kits for under $500.


You can sell the 4.10's to someone running 31's on a 2wd XJ that correct for that tire.

Originally Posted by roninofako

So, if you're taking it somewhere, why not just have them do the work? They're gonna have to do it all again anyways, regardless of what you have or haven't done. How do you know the axle isn't bent? Did you paint the gears and get a pattern before you disassembled? Measure the preload on the pinion with a running torque wrench? There's a LOT involved when doing this type of work, and it certainly does take someone who KNOWS what they're doing, to do it correctly. The way your original post read, the advice given was valid. Lashing out at knowledgeable folks on the site for your **** poor wording isn't cool.

As far as re-using the gear set...yes it can be done, but, I'm a fan of replacement with known good parts, so personally I would NOT re-use a gearset. If you're planning on going bigger tires, now is the time to get a different gear set, and as mentioned, you'll need to do the front axle as well, unless you're 2wd. That said, if the old gearset is in decent shape, sell it, recoup some of your cost. If you decide to go with a new gearset, just stop what you're doing, take the axle to the shop, and let them take care of it. They need to do things like get the numbers off the current gearset, measure the shim packs, things like that, and it would be easier for them to do it, and get it right, than have to try and backtrack what you may or may not have done. Just my 2 Lincolns.

Originally Posted by Jeep Driver

Chrysler 8.25 (factory) are 4.10s, not 4.11s........not that it matters, but that's what it is.


You screwed the pooch, you should have never touched a factory LSD 4.10, you should have sold it.
There is some guy hunting and hunting and hunting for that rear....as I was for 4 months. Needed it to match my front. They only came with the 2.5 XJ.
If you are going to re-gear you should have used a dime-a-dozen 3.55

I run 32s with a tired 2.5 and will run 33s (305-65-18) next year with a fresh 2.5........does just fine with 4.10.

Originally Posted by Shortleged1

You'd recommend 4.56s for even if it is a DD and only sees light trails(no rocks)? The best I have to compare are those gear charts, what are your RPMs like on highway with the 33/4.56?

Originally Posted by Fred/N0AZZ

4.56 gears and 33" tire bring the Jeep back to what it came with stock a set of 3.55 gears. Mine on the highway doing speed limit (55mph) is about 1570 rpm's at (70 mph) about 1750-1800 rpm's. I do have a considerable drag factor and weight but still can get about 16-17 mpg highway 4 1/2" lift.


Mine is not a rock crawler either but some difficult trails we run a lot.

Originally Posted by Shortleged1

How accurate would you call this http://www.4lo.com/calc/geartable.php It looks like the 4.56 w/ 35s is just as close to the 4.11 w/ 33s on that number which is close to the stock/3.55 setup. Weight wise, I just have bumpers and winch.

Originally Posted by XJwonders

that chart doesn't just apply to manuals, they also apply to automatics in third gear (1:1) at 60 mph. With manual 5 speed at 1:1, it would be the fourth gear.

Originally Posted by roninofako

Instead of guessing, just go here and plug in your numbers... http://www.grimmjeeper.com/gears.html

Originally Posted by T-Rexj

I have been told I have a 8.25. How would I verify this?

Originally Posted by toasterknight

Look at the diff cover. A Dana 35 will say Dana on the cover and be flush with the bottom of the housing. The 8.25 will stick down below the diff cover.