Tranny Help, Any Ideas?

[Kona]

Hi guys, so I got a 87 mj column shift , I redone the engine and it runs great!, redone the tranny seal and filter , now the truck won't shift ? Stays in first gear , it shifted fine before the maintance , fluids are good, my question is did I maybe forgot to plug something? Connector ? Or did I just f-up the tranny by replacing fluids and filter? It's just weird it won't shift now, any ideas on what to check or do other than a new tranny? Thanks!

[jimoshel]

Kind of hard (But not impossible ) to screw up a tranny by changing fluid an filter. Should be looking at the shift linkage. Didn't get something hooked up or not hooked up right.

[Kona]

Could it be the TPS? All is hooked links, I have done this several times an never had a problem, now the TPS when unplugged does not affect the idle, so I'm thinking the tps is fried! My understanding is that TPS will cause this as well. Anyone had this?

[Geonovast]

The AW-4 doesn't like full one-shot fluid changes, you have to do it slowly, one quart at a time. You may have pissed off the trans itself.

 

Unplug the TCU and see if you can shift it manually.

[Kona]

Unplugged the TCU and I'm able to shift manually no problem, could it be the TPS? Or jut need a new TCU?

[Kona]

Update: I bought a new TPS and plugged the TCU back and.... Still does the same thing , stuck in first gear, unplugged theTCU and fine! (manually) so I guess need a new TCU? Found one on eBay from a 89 xj, will this work?

[ComancheKid45]

If its from an 87-90 XJ or MJ it should be a direct swap :thumbsup:

[HOrnbrod]

Have you checked the 12V input at the inline fuse on the TCU harness?

[Kona]

Good idea!, didn't think about that, I'll check that tomorrow and get back to you all. Thanks

[alleydog]

My Son's XJ did the same thing. It was a bad output speed sensor, located on the left rear of the trans. I have seen it described as a switch. You can test it with an ohm meter, I believe, should flick between open and closed as you turn the rear output slowly. maybe it yust got unplugged.

[deziped]

Check the OHM value of your solenoids in the AW4. You can do it at the TCU.

[cruiser54]

New engine? Did you get the grounds hooked up at the engine dipstick tube stud? To a nice shiny surface? That's the ground for the TCU itself and the TCU shift logic circuit.

[Kona]

All good things to look for, all grounds seem

To

Be in place, but I'll re check, I'm waiting in the "new TCU" we will see if that fixes it, I think is the TCU just because my buddy just threw the thing on the floor like it was garbage so maybe it got banged up and damaged inside.