Comanche County Posted June 17, 2015 Share Posted June 17, 2015 I'm building a YJ for a buddy, it has ended up as a 258 with a waggy 727 and twin sticked 229. I was gonna use a 231 but the input shaft on my extra 93' 231 was too short to seal on the trans output seal. I know the later 231s have a longer shaft but I don't think they'd work either. So for now I'm twin sticking the Waggy 229 for now to get him rolling. Eventually if like to throw in a 231 or 242 and I've read some other forum posts about a double seal for the 231 input. If anyone has successfully mated a 727 and one of the newer NP TCs please let me know how you did it. Thanks! Link to comment Share on other sites More sharing options...
Rockfrog Posted June 17, 2015 Share Posted June 17, 2015 Use the input gear from a ZJ 247/249 ... They will swap in to any 2 series t-case (ie - 231, 242) and are the longest input gear used, specific to the ZJ, and another inch longer than the standard longer XJ, MJ, YJ, TJ length input gear (actually considered medium length). Any worn/blown up 93-98 ZJ case will get you the input gear you want. Link to comment Share on other sites More sharing options...
Comanche County Posted June 17, 2015 Author Share Posted June 17, 2015 Thanks for the reply. I thought that might work also. I've got two spare 98' 249s, but thought the gear cut change in 94' would preclude using a 98' input shaft in a 93' 231? Link to comment Share on other sites More sharing options...
Rockfrog Posted June 17, 2015 Share Posted June 17, 2015 The gear cut only affects the annulus and sun gears of the low range planetary assembly. The splined input gears are still the same pattern without change. As are the rest of the internals of 231 and 242's ... You just have a few part year changes that need to match (as in needle bearing/no needle bearing shaft, synchro/no synchro assembly), but again nothing that affects the input gear. Just disassemble the planetary to get at the input gear. Link to comment Share on other sites More sharing options...
Stacks Posted June 17, 2015 Share Posted June 17, 2015 I ran into the same issue when I put an A999 out of a '85 CJ8 behind my 4.0 replacing a BA10. Got a replacement input shaft for the '92 NP231 and was good to go. Wanted to put a 727 in but none to be found at the time. Link to comment Share on other sites More sharing options...
Comanche County Posted June 17, 2015 Author Share Posted June 17, 2015 Thanks for the info guys! Link to comment Share on other sites More sharing options...
dasbulliwagen Posted June 17, 2015 Share Posted June 17, 2015 I was going to say the 727 is probably really an A999 if it was originally behind a 258. At least thats what was in the Waggy I had... 258, A999, NP228 Link to comment Share on other sites More sharing options...
Comanche County Posted June 17, 2015 Author Share Posted June 17, 2015 Came from an 89' Waggy with a 360. Link to comment Share on other sites More sharing options...
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