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Discussion Starter #1
After swaping in a 98 AW4 from a XJ into a 91 MJ, the tranny seems to shift from either 1st directly to 4th, or through all the gears immediately upon stepping on the gas. Reverse works fine.

Notes on the swap:
1. Tranny was originally intended for a 90 XJ and the harness for the tranny was modifed to run the 90 plug ends.
2. Still running 91 TCU.

Please help me rate potential causes / fixes:
1. Install 98 TCU?
2. Check TPS. IS there a difference in TPS's from different years? Possibly bad TPS in the 91 or need a 98 TPS?
3. Screwed up the connectors during the plug swap?
4. Got a bad tranny?


Thanks,
Jay
 

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I don't have my FSM with me or I'd check the pinouts, but it sounds like you've got something wired wrong. I would guess that your TPS is sending a signal to a solenoid or something....

For the record, that's a WAG.
 

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Discussion Starter #3
Anyone know if the pinout from the tranny plugs changed between a HO and a non HO? I'm thinking that wiring the tranny for a non-HO and installing it on the HO might be causing some problems.....
 
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