Recent content by MattTheHam

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4l80e flakey rev and commanding 4th when in 3rd

Any ideas? @NickTransmissions
- MattTheHam
- Post #12
- Nov 21, 2023
- Forum: Transmissions
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4l80e flakey rev and commanding 4th when in 3rd

Sadly I didn't take any pictures :( By check ball shell, I meant the 3rd/rev sleeve as shown in the diagram you sent me. I did replace the gaskets, both of the gaskets in the valve body-plate-case stack are black gasket material...
- MattTheHam
- Post #9
- Nov 18, 2023
- Forum: Transmissions
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4l80e flakey rev and commanding 4th when in 3rd

Alright, finals are done and repairs completed, unfortunately not all is working. New oring on the 3/rev check ball shell, new harness, checked all solenoids, checked all shift valve movement, and replaced the 1-2 2-3 shift springs. Also replaced the tcc valve. Fixed - TC Lockup is back and...
- MattTheHam
- Post #7
- Nov 18, 2023
- Forum: Transmissions
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4l80e flakey rev and commanding 4th when in 3rd

Thank you Nick for the expertise! I'll pull the valve body and do as you have suggested. I don't have a vac tester, but I can see if a local shop has one and will test it. I'm about to go into finals week so it might be a few days before I can get you updated with results.
- MattTheHam
- Post #5
- Nov 7, 2023
- Forum: Transmissions
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4l80e flakey rev and commanding 4th when in 3rd

Thanks for the advice Nick! I tried swapping the speed sensor, no change :( There is no fourth at all. When in OD range I can see the computer command it, but it stays in 3rd and never shifts into 4th. After a few seconds it throws code68 and stops commanding 4th and puts it back into 3rd...
- MattTheHam
- Post #3
- Nov 7, 2023
- Forum: Transmissions
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4l80e flakey rev and commanding 4th when in 3rd

Good evening all. I am having some strange problems with the 4L80E in my 92 6.5L K2500, and I'm looking for some advice. The truck is new to me and has 180K on it, but the trans was rebuilt by a well known local trans shop at 152k. I've rebuilt blown manual transmissions before, but autos are...
- MattTheHam
- Thread
- Nov 7, 2023
- 4l80e
- Replies: 12
- Forum: Transmissions