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Old 02-23-2009, 02:47 PM   #1
nu arty boy's Avatar
Join Date: Feb 2009
Location: Michigan
Posts: 91
Trans/T-Case/Driveshaft questions

I'm pretty new here (but not new to Jeeps) and I have to ask you experts this:

I need a new trans, T-case, and rear driveshaft. The previous owner of my TJ must have been retarded or something because with only 163K on the clock everything is failing. The rubber boot that covers the slip-yoke is gone and now the driveshaft is frozen to the output shaft on the t-case. All of the gears (minus 4th) in the trans are grinding, probably from worn out syncros. Why he didn't keep up with the maintaince I don't know. I should have looked it over better...

My question is this: Can I mix and match transmissions and T-cases from different model years? I know that Jeep went from the AX-15 to the NV3500 to that Mercedes 6-speed over the 10 years they made the TJ. Is there any difference in the different model years of the 231 T-case that I should know about?

I am already planning on a SYE so I don't have this problem ever again. Might as well do all of this at the same time.

BTW I have a 1997 sahara

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Old 02-23-2009, 10:01 PM   #2
markhuntsville's Avatar
Join Date: Sep 2008
Location: Huntsville, AL
Posts: 49
Trans , Xfer, etc

As long as you are staying with a manual, the 231s are all the same (at least in TJs). Same input spline count which is what matters. There MAY be some differences in the selector and the speedometer connectivity over the years, so you'll need to match this up when buying the SYE.

'97 TJ, 4.0, lots of good parts...
Sold and gone to Michigan
'06 LJ, 4.0, 42RLE, 241OR+2LO, HPD30, Rubi44, 4.88s
4.5" RE Superflex Short Arm, Bilstein 5100s, 9.5CTi, 35" MT/Rs... (phase 2)
Phase 3=Home-made 3-link front>>Phase 4=Trussed, RCVd, Rubi44 front>>Phase 5=ORIs (already purchased) and linked rear
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Old 02-25-2009, 03:29 PM   #3
nu arty boy's Avatar
Join Date: Feb 2009
Location: Michigan
Posts: 91
After some research, the input and output spline counts are all the same on the 231 as well as the transmissions. Do the transmissions use the same mounting locations or do I need to change any brackets? What about the clutch linkage and slave cylinder - can I use the one from the AX-15 or do I need to get this stuff specifically for the new trans? Is there anything else that I may be missing?
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