MJ Comanche Tech. Stock & Modified. MJ (86-92)
All discussion regarding the Jeep Comanche, the pickup truck related to the Cherokee platform.

MJ Transfer case

Old Mar 2, 2020 | 06:37 AM
  #1  
ldbackdfk's Avatar
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Year: 2000
Model: Cherokee (XJ)
Engine: scrate 6
Default MJ Transfer case

Looking for a transfer case for a Comanche with an manual transmission. Can you guys tell me what model Cherokee I need to look for to hopefully find one or maybe some websites that might help me out. Thanks in advance.
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Old Mar 3, 2020 | 08:30 AM
  #2  
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From: Castle Rock, CO
Year: 1987
Model: Comanche (MJ)
Engine: 5.3
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Find an XJ from the same model year with the same engine and a manual transmission. Should be a direct swap.

Outside of that, check the spline count on the tail shaft of your MJ transmission. It should be 21 or 23 spline. 21 spline is easier to find on older XJs and 4 cylinder models. 23 spline is newer years with the 4.0. I forget the exact cutoff date.

If you have a 4.0 with the Peugeot 5 speed transmission, now is a great time to upgrade to an AX15. It's an all around better transmission. Find one of the newer XJs (93 or 94 and newer?) so you get the external slave cylinder and swap both the transmission and t-case as a unit. You'll need the donor's transmission crossmember and maybe need to splice a couple of wires onto different connectors for the transmission. But it's a really good upgrade.
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Old Mar 3, 2020 | 10:27 AM
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ldbackdfk's Avatar
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Originally Posted by derf
Find an XJ from the same model year with the same engine and a manual transmission. Should be a direct swap.

Outside of that, check the spline count on the tail shaft of your MJ transmission. It should be 21 or 23 spline. 21 spline is easier to find on older XJs and 4 cylinder models. 23 spline is newer years with the 4.0. I forget the exact cutoff date.

If you have a 4.0 with the Peugeot 5 speed transmission, now is a great time to upgrade to an AX15. It's an all around better transmission. Find one of the newer XJs (93 or 94 and newer?) so you get the external slave cylinder and swap both the transmission and t-case as a unit. You'll need the donor's transmission crossmember and maybe need to splice a couple of wires onto different connectors for the transmission. But it's a really good upgrade.
Very helpful! Thanks for that info!!
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Old May 13, 2024 | 03:59 AM
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That Jeep Guy XJMJ's Avatar
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From: Michigan
Year: 1987 MJ, 1973 J2000, 1986 XJ, 08 JK
Model: Comanche (MJ)
Engine: 4.0L H.O
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Engine and trans isn't gonna make a difference for your donor tcase fitment.

If your 90 and older stick to the 90 and older donor (21 spline as mentioned). If your 91 and newer stick to the 91 and newer (23 spline as mentioned) BUT especially lean towards a 96+ tcase. They have a sealed output shaft. Vs the 91-95 units when you remove the rear driveshaft - you leak fluid
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Old Aug 18, 2025 | 03:30 AM
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That Jeep Guy XJMJ's Avatar
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Year: 1987 MJ, 1973 J2000, 1986 XJ, 08 JK
Model: Comanche (MJ)
Engine: 4.0L H.O
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Originally Posted by jameder92
Outside of that, check the spline count on the tail shaft of your MJ transmission. It should be 21 or 23 spline. 21 spline is easier to find on older XJs and 4 cylinder models. 23 spline is newer years with the 4.0. I forget the exact cutoff date.
Fishing for comment points are we? Or failed quotes??

Last edited by Veeb0rg; Aug 22, 2025 at 04:27 AM. Reason: removed spam links
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