Slipping Transmission?

[Jerry Bransford]

My TJ is locked up under a cover or I'd go look but I'd get the engine warm and check it again and make sure it's up to the furthest full line up the dipstick. I forget the difference between the lines on my dipstick, there's only one I pay attention to and that's the one closest to the top of the dipstick.

 

[Alan Irvine]

It looks bright red and smells very clean. It is up to the COLD full mark and its been about 2 hrs since I drove it.

I just checked again warm and added 1/2 quart of ATF+4 and didn't get out of the neighborhood before the Light came on again and threw P0750. It got dark and I had to stop playing for the night. Anything else I can check tomorrow ?

 

[Alan Irvine]

First thing to check is your transmission's ATF level and the quality of the ATF. Is it bright clear red looking and without a burnt smell? Any metallic particulates in the ATF on the dipstick?

Check your ATF level by starting your engine and leaving it running with the transmission in Park. The engine MUST BE RUNNING while checking the transmission's ATF level. Make sure the ATF is all the way up to the full line, being below the full line can cause problems/slippage. It's far better for an automatic transmission to be slightly overfilled than underfilled. If it's low bring it up to the full mark with ATF+4, no other type of ATF is correct. If it doesn't say "ATF+4" in big letters on the front of the ATF bottle it's the wrong stuff.

I may have replied to myself. See note below. Thanks for your help.

 

[Jerry Bransford]

There may be some useful information at https://www.jeepforum.com/threads/p0750-code-transmission.1261759/#post-12132122