Dadinator Posted July 4, 2013 Share Posted July 4, 2013 Is there any difference in a np231 transfer case with a manual tranny vs. auto? Thanks! Link to comment Share on other sites More sharing options...
AeroNautical Posted July 4, 2013 Share Posted July 4, 2013 Not in the XJs and MJs, but wrangler 231s are clocked differently. Edit: mid 89 and before had different splines between the t-case and tranny for the peugeot, and I'm sure for the aw4 also. Link to comment Share on other sites More sharing options...
Dadinator Posted July 4, 2013 Author Share Posted July 4, 2013 My 90's transfer case needs replaced. I had one over a year ago and sold it. Figures. I need to get another. I knew the wranglers were clocked differently. Thanks. Just wasn't sure if the bolt pattern, input, etc. was the same from auto to manual. If they are the same, then my search will be easier. Link to comment Share on other sites More sharing options...
Geonovast Posted July 4, 2013 Share Posted July 4, 2013 Not in the XJs and MJs, but wrangler 231s are clocked differently. Edit: mid 89 and before had different splines between the t-case and tranny for the peugeot, and I'm sure for the aw4 also. Wrangler cases are clocked differently, but the difference is where the holes are drilled on the trans, not on the case. Link to comment Share on other sites More sharing options...
mvusse Posted July 4, 2013 Share Posted July 4, 2013 Depending on transmission, the input shafts are different: 4 cylinder manual transmission (AX4 or AX5) is 21 spline short input shaft. 6 cylinder manual transmission (Peugeot) is 21 spline short input shaft or 23 spline long input shaft. 6 cylinder manual transmission (AX15) is 23 spline short input shaft 6 cylinder automatic transmission (AW4, through 1990) 21 spline short input shaft. 6 cylinder automatic transmission (AW4, 1991 and newer) 23 spline medium length input shaft. Don't know about 4 cylinder automatic, never seen one. Link to comment Share on other sites More sharing options...
Dadinator Posted July 4, 2013 Author Share Posted July 4, 2013 So, since I have a 1990 with a AX15, I will need to get one from an AX15. Or I'll have to change out the input shaft with my current one, no? Link to comment Share on other sites More sharing options...
mvusse Posted July 5, 2013 Share Posted July 5, 2013 What's wrong with your current one? Around 1994 the 231 transfer case was redesigned, and they changed the cut of the gears. As long as your current one and your new one are the same generation the input shaft will swap over. It will take a complete teardown to do it, though. AFAIK the input shaft will also swap to the 242 and 249 cases, not sure about the 241. Link to comment Share on other sites More sharing options...
jpdriver1 Posted July 5, 2013 Share Posted July 5, 2013 good question dadinator --- this helps me also --- will be doing a total transplant from my 90 to the 89 === thanks to the gurus for the info Link to comment Share on other sites More sharing options...
Dadinator Posted July 6, 2013 Author Share Posted July 6, 2013 What is wrong with mine is unknown as I have not taken it apart. The symptom is in 4x4 something is slipping and popping. I thought it was the spider gears in the front axle. The sound seemed to come from the front. After opening up the pumpkin and checking the CAD, I determined that the problem is not in the axle. All gears looked great. I welded the 2 piece axle while in there because I thought maybe the collar of the CAD was messed up inside and causing the issue. Drove it and same issue. So, I grabbed the front drive shaft and moved it and the inside of the Xfer case made some ratting sounds. Not good. I figure I may be able to pick one up at a bone yard cheaper than tearing into it and buying parts to fix. Sadly I used to have a spare and sold it about a year ago. Was unemployed and needed $. Link to comment Share on other sites More sharing options...
Geonovast Posted July 6, 2013 Share Posted July 6, 2013 Adjust your linkages first. Link to comment Share on other sites More sharing options...
Dadinator Posted July 6, 2013 Author Share Posted July 6, 2013 Adjust linkage? It isn't popping out or anything, by the sound of it, there are broken gears. You think linkage out of adjustment would cause this? Link to comment Share on other sites More sharing options...
Geonovast Posted July 6, 2013 Share Posted July 6, 2013 They may be making it so it's not coming out of 4wd enough, to where things inside are not engaged, but grinding against each other. I would just try to eliminate everything before going through the pain of pulling the case. Link to comment Share on other sites More sharing options...
mvusse Posted July 8, 2013 Share Posted July 8, 2013 My bet is on a stretched chain. Link to comment Share on other sites More sharing options...
Bounty Hunter Posted July 8, 2013 Share Posted July 8, 2013 Not in the XJs and MJs, but wrangler 231s are clocked differently. Edit: mid 89 and before had different splines between the t-case and tranny for the peugeot, and I'm sure for the aw4 also. Wrangler cases are clocked differently, but the difference is where the holes are drilled on the trans, not on the case. Wrangler cases are clocked differently due to the attachment holes in the transmissions being different between Wranglers and XJ/MJ's. The bolt pattern on the front of the transfer cases is the same between Wranglers and XJ/MJ's. So don't worry about a transfer case that comes out of a Wrangler, what you need to pay attention to is input shaft type and rear output length, as they were different lengths over the years. Link to comment Share on other sites More sharing options...
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