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Old 11-04-2013, 05:18 PM
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Originally Posted by 3197193
i have an 88 xj with a busted np242. 4.0 auto. what should the spine count be on the transfercase. i havnt pulled it out yet. i was trying to find a replacement before i take it out. did a search and getting some conflicting replys. this one is bone stock for now. lift and tires coming soon. 31's will be big enough for what i want to do but other mods will follow. tghanks
I am seeing either 21 or 23 spline. If memory serves me right, the NP231 gained splines later in its life/design, so would the NP242 also? Let me look some more...


Input Spline:

Most applications use a 23 spline female input shaft.

Last edited by 1991Jeep_Man; 11-04-2013 at 05:20 PM.
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Old 11-04-2013, 05:47 PM
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Is this the cause of my 6.6 mpg? I got a hold of a temp gun today, pretty cool, anyway the temp going into the cat was about 160 and coming out was around 300?
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Old 11-04-2013, 05:58 PM
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Originally Posted by 1991Jeep_Man
You should know I joke lol. Unfortunately I have noticed the attitudes too.. I think 'Fab' had a guy who busted the bad dude attitude at first on some thread about using carbon fiber to tie in his fender flares or something.

Also, wanted to ask... I saw something about a guy pulling the guts from his XJ prop valve and simply removing an o-ring to allow 50/50 split pressue... at first glance I am hesitant and will likely still hold out for a ZJ prop valve, but does this other mod hold value?
Hold out for the "gut swap".
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Old 11-04-2013, 05:59 PM
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Originally Posted by 3197193
i have an 88 xj with a busted np242. 4.0 auto. what should the spine count be on the transfercase. i havnt pulled it out yet. i was trying to find a replacement before i take it out. did a search and getting some conflicting replys. this one is bone stock for now. lift and tires coming soon. 31's will be big enough for what i want to do but other mods will follow. tghanks
21 spline in 88. Through about 90.
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Old 11-04-2013, 06:56 PM
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Originally Posted by cruiser54
Hold out for the "gut swap".
10-4. I'll keep my camera at the ready when I do.
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Old 11-04-2013, 07:49 PM
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Originally Posted by 1991Jeep_Man
10-4. I'll keep my camera at the ready when I do.

For sure!!
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Old 11-04-2013, 07:59 PM
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thanks guys if i cant find a 242 ill go with a 231 21 spine yall rock
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Old 11-04-2013, 08:34 PM
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I'm going to be taking the headliner out in a few weeks and want to make an overhead console but I'm not sure if I should make it out of aluminum or wood. What would be the best things to put up there besides a CB. Also I have some spare 5x7 speakers I may want to put up there.

Last edited by ccooper1234; 11-04-2013 at 08:37 PM.
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Old 11-04-2013, 08:56 PM
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I have a friend that had an idea. He has been looking around to build aa sort of budget sleeper drag suv and he said he was thinking about buying a cherokee, lowering it, stroking and supercharging it. I know it would look stupid and it goes against what a cherokee is but could it be done? Would he end up with a fastish car?

PS I promos its not my idea. I'm going lifted my coil spacers and shackles are already on the way to my house.
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Old 11-04-2013, 09:02 PM
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There are a couple people in the Build section who have super or turbo'd their 4.0. It looks ridiculous! I can kind of support it.
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Old 11-04-2013, 09:12 PM
  #36971  
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Originally Posted by ridinclassic
I have a friend that had an idea. He has been looking around to build aa sort of budget sleeper drag suv and he said he was thinking about buying a cherokee, lowering it, stroking and supercharging it. I know it would look stupid and it goes against what a cherokee is but could it be done? Would he end up with a fastish car?

PS I promos its not my idea. I'm going lifted my coil spacers and shackles are already on the way to my house.
Depending on how much power he ends up with, he may need to strengthen the unibody. If he wants to go fast, he should be looking at a motor swap. SBC swaps aren't unheard of, and a 350 or 383 would turn the XJ into one hell of a sleeper. The stock 4.0L in an XJ can be bored and stroked, but a stroker motor won't last as long due to the increased wear. Finally, he'll need to make sure he can get that power to the ground, so an LSD and maybe some wider rear tires would be in order.

A 2WD Cherokee will simplify things with the lowering. Cut (don't torch) a loop out of the coils up front and do a SUA swap on the rear with some 3" lift springs. I think the AW4 can handle power reasonably well if he goes the auto route, but I'd swap in a 700r4 if I were doing a motor swap anyway. I'm not familiar enough with manual transmissions to give advice in that department.

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Old 11-04-2013, 09:22 PM
  #36972  
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Yeah, lowered/stroked/blown XJs are actually out there racing... can't remember where I saw the threads though.
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Old 11-04-2013, 09:25 PM
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And there's a video on YouTube of a mj that gets 10's in a 1/4
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Old 11-04-2013, 09:28 PM
  #36974  
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Originally Posted by salad
Yeah, lowered/stroked/blown XJs are actually out there racing... can't remember where I saw the threads though.

Start with Team Pettycash Racing. They don't do much expensive work due to their racing rules, but they have a good bit of experience.
pettycashracing.wordpress.com

There simply aren't many performance gains to be had from the 4.0L. Pretty much anything above airflow mods and injectors will require mods to sensors if not full PCM replacement.
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Old 11-04-2013, 09:44 PM
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Maybe do a ls1 or ls2
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