Eagle Posted September 8, 2009 Share Posted September 8, 2009 Find a set of 4.10 axles regardless of the tire size. :D I disagree. I've driven Pat's 87 on 4.10s with IIRC 31s, and for street driving it felt like too much gear. I think 3.73 would have been nicer. I'll see your disagree, and I disagree with your disagree. 3.73 gears with 31" tires is EXACTLY the same overall final drive ratio (expressed as RPMs per MPH) as stock tires and 3.54 gears. But the tires are much bigger and heavier. 3.73 is a good ratio for 30s. 4.10's is perhaps optimum for 31s and okay for 32s, anything bigger needs 4.56 or 4.88. Back to the original poster -- I would agree that 31x10.50s would be a better choice for you, and you can run them with no lift. (I'm currently running 31x10.50s on my '88 XJ, which has smaller rear wheel wells than the MJ.) However, if you MUST go to 33s, be very careful regarding width. Factory Jeep wheels have 5-1/4" backspacing. In the back, 31x10.50s end up very close to the inner fender and to the leaf springs. If you try to run tires any wider than 10.50, you will absolutely have to go to aftermarket rims that have less backspacing. "Cool," you might say. "No problem." Except that the vehicle has a front axle. In the front, 10.50 width tires on stock rims tuck up neatly inside the flares and sheet metal. Put the same tires on aftermarket rims with less backspacing, and suddenly when the suspension compresses the tires crash into the flares and sheet metal. Hilarity ensues. It's not really a good idea to go bigger on tires than what you actually need. As with lifts and pretty much everything Jeep-related, cost increases exponentially with size. The higher cost of big tires is only the beginning. Link to comment Share on other sites More sharing options...
ncgamedog Posted September 8, 2009 Author Share Posted September 8, 2009 ^ thats a good point. I was thinking 33x10.50 BFG KM2's on the stock TJ rims. But it may be better to just stay on 31's. So what year and vehicle type should I be looking for to score a non-vac HP 30 w/ 4:10's? a 4cyl TJ? I thought about an IFS toyota rear axle to get 4:10's...but they are only 58" wide WMS-WMS Link to comment Share on other sites More sharing options...
Pete M Posted September 8, 2009 Share Posted September 8, 2009 All TJs have low pinon front axles. But for what it's worth, on a 3" lift, a low pinion axle should work just fine. :thumbsup: Look for XJ front axles. Being non-vac is overrated since it's easy to bypass the CAD. Link to comment Share on other sites More sharing options...
ncgamedog Posted September 8, 2009 Author Share Posted September 8, 2009 what do I need to do to bypass it? get a later model shaft? and what kind of seal? Link to comment Share on other sites More sharing options...
Pete M Posted September 8, 2009 Share Posted September 8, 2009 It's a simple process to pull the cover and use the clip to keep the collar engaged. :thumbsup: No extra anything. Link to comment Share on other sites More sharing options...
ncgamedog Posted September 8, 2009 Author Share Posted September 8, 2009 how road friendly is that? will the front shaft then turn all the time? Link to comment Share on other sites More sharing options...
Pete M Posted September 8, 2009 Share Posted September 8, 2009 It'll be exactly the same as if you swapped in a one-piece shaft. Exactly like all late-model Jeeps. :thumbsup: Link to comment Share on other sites More sharing options...
Geonovast Posted September 8, 2009 Share Posted September 8, 2009 Yup, they did away with it in the XJs completely by about 92-93, and totally gone by 96. IIRC ALL YJs have the CAD. Link to comment Share on other sites More sharing options...
ncgamedog Posted September 8, 2009 Author Share Posted September 8, 2009 so: 92+ xj front 94+ ax-15 any 231 and ... Oh, can I easily mod my 2wd center console or find a 4wd version? Link to comment Share on other sites More sharing options...
Geonovast Posted September 8, 2009 Share Posted September 8, 2009 2wd and 4wd center consoles are the same, basically. You're little coin holder will pop right out, and the 4wd shifter bezel will go in its place. And not "any" 231. You need a 23 spline. You can swap a 23 spline input into a 21 spline, however, if it comes down to that. Link to comment Share on other sites More sharing options...
ncgamedog Posted September 8, 2009 Author Share Posted September 8, 2009 right...23 spline which is 91+ good deal on the console b/c the one in there is really nice... thoughts on running a toyota rear? Link to comment Share on other sites More sharing options...
Pete M Posted September 8, 2009 Share Posted September 8, 2009 Does it match the front? Link to comment Share on other sites More sharing options...
dasbulliwagen Posted September 8, 2009 Share Posted September 8, 2009 Where in NC are you.... just curious. Never seen anyone run a yota rear, the ford exploder 8.8 is much more popular, and can be had stock with 4:10 and limited slip and disc brakes. Link to comment Share on other sites More sharing options...
ncgamedog Posted September 8, 2009 Author Share Posted September 8, 2009 well IFS versions (86+) are almost always 4:10 and 58" wide WMS-WMS Link to comment Share on other sites More sharing options...
Pete M Posted September 8, 2009 Share Posted September 8, 2009 wheel bolt pattern? Link to comment Share on other sites More sharing options...
Geonovast Posted September 8, 2009 Share Posted September 8, 2009 right...23 spline which is 91+ All AX-15s will be 23 spline, and they started getting put in halfway through 89. If you end up using a mid 89-90 trans, you'll need a special pilot bushing, but a T-case from those years will work fine. IIRC the AW-4 went to 23 spline in 90, so you could use one off of that too. thoughts on running a toyota rear? Personally, I wouldn't. Width isn't the same, and it's gonna be some work getting it in there. You'd better off finding an XJ axle and re-welding perches. Keep it Jeep. Also, I wouldn't get too picky about your front axle. The CAD really isn't a problem, and some say the CAD housing is actually stronger than the non-CAD. You can easily lock it over, or pop a non-CAD shaft in later on. Link to comment Share on other sites More sharing options...
ncgamedog Posted September 8, 2009 Author Share Posted September 8, 2009 ...yeah I knew about the 8.8, wasnt sure how hard it would be to find a 4:10 version... I grew up north of statesville, but I'm in school in charlotte at UNCC Link to comment Share on other sites More sharing options...
dasbulliwagen Posted September 8, 2009 Share Posted September 8, 2009 The 8.8 also has the right bolt pattern for the wheels. Link to comment Share on other sites More sharing options...
dasbulliwagen Posted September 8, 2009 Share Posted September 8, 2009 car-part.com will bring up any number of 8.8's with 4:10 and limited slip for $300 and up, or pick-n-pull for half that. Link to comment Share on other sites More sharing options...
ncgamedog Posted September 8, 2009 Author Share Posted September 8, 2009 wheel bolt pattern? theres the catch...6 lug. 2wd models are 5x4.5 but not sure on the width and ratios for them. Link to comment Share on other sites More sharing options...
dasbulliwagen Posted September 8, 2009 Share Posted September 8, 2009 There are a bunch of members on here from the Charlotte area. Go to the wheeling section and to SE area and youll see whos around. Link to comment Share on other sites More sharing options...
ncgamedog Posted September 8, 2009 Author Share Posted September 8, 2009 car-part.com will bring up any number of 8.8's with 4:10 and limited slip for $300 and up, or pick-n-pull for half that. is there an easy way to identify the 8.8 ratios w/o pulling the cover? like at the pull-apart Link to comment Share on other sites More sharing options...
dasbulliwagen Posted September 8, 2009 Share Posted September 8, 2009 You may know stuff about the yota axle already, but I think it would best to stay away from it in an MJ, Too many other good options available. Link to comment Share on other sites More sharing options...
ncgamedog Posted September 8, 2009 Author Share Posted September 8, 2009 There are a bunch of members on here from the Charlotte area. Go to the wheeling section and to SE area and youll see whos around. cool...maybe someone has a good deal on an ax15 for me. that is worrying me... yeah I agree on the toy axle...its super strong though. Link to comment Share on other sites More sharing options...
dasbulliwagen Posted September 8, 2009 Share Posted September 8, 2009 I have yet to get to the point of swapping in an 8.8. But go to therangerstation.com, and you should be able to find that info. Link to comment Share on other sites More sharing options...
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