NP242J: Rebuild or Replace
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Year: 1991
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Hey all, I've got a 1991 XJ with the NP242J that I'm certain has never been rebuilt. Opinions! Should I rebuild the 242, or replace with a 231. If replace, why and how hard to do the swap?
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You DO know you might need to back up a bit to get out of 4WD? Btw the 231 is stock, not aftermarket. I'm pretty "green" on the drive stuff, but Jeep sold a bunch of stuff with 231 T-Cases, and whatever it is, it might need to "loosen" its gears before it will shift. (I mean release any binding as you back up).
Last edited by DFlintstone; 12-17-2013 at 03:53 AM.
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With the np231 the aftermarket is tiny its slip yoke eliminator,2 wheel low and a 4 to 1 kit from teraflex which is 1200 bucks and not known to be the best made thing either.Keep your stock t case if it does break then look in to upgrades
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Just change the fluid... If you're really bored over the winter throw in new bearings, seals, and shift fork pads. Could inspect chain for stretching.
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You DO know you might need to back up a bit to get out of 4WD? Btw the 231 is stock, not aftermarket. I'm pretty "green" on the drive stuff, but Jeep sold a bunch of stuff with 231 T-Cases, and whatever it is, it might need to "loosen" its gears before it will shift. (I mean release any binding as you back up).
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Use it more often, it should get easier to switch between gears. Mine was like that (242 as well but I think this is for all T-case) and I try to switch it atleast once a week and it is alot easier now.
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