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found myself time to dig into this problem today. I found as I was checking the detent solenoid resistance, that the connection was not good at the plug. I replaced the plug and took it for a test drive. It now works great, up shifting and downshifting like it should. I want to thank everyone...

It was in drive, all was good and working well, needed to speed up, put my foot into it due to traffic. It down shifted to 1st and now will not shift out of 1st. I have not manually shifted when driving

30 to 35 mile max @ what sounds like a very high rpm

Your right I did say that, after your post I rechecked it after running it for 40min then pulled it into the shop and checked it with it still running. The level is still fine. I have no park only R N D 2 1. It will go into reverse and 1st without any hesitation at all or any need to wait after...

I did have it running for about 40min and then drove it into the shop and had it running as I was checking the level. I would think that it would have been good to check at that point.

I'm by no means a transmission guy and have become very rusty with the smaller stuff. Any help at this point is good help. What is the switch on the passenger side of the pump used for, is that some kind of kick down switch?

I was also. I did remove it from the trans and manually pulled the cable it looks to be working. I also checked to see it the plunger inside the trans was moving, which it is

I have not checked it after driving around and it is warm. Then its not a 3l80e then. only has one wire going to what I think is the Detent Solenoid? on the left side

I did check the mechanical modulator and it looks to be working. Thank you for the welcome.

Looking for some help with a m998 hmmvee (6.2 with 3l80e). Unit has 7,700miles on new engine and trans. All fluid levels are at spec and clean. Unit has a complaint of: when last in operation ,transmission kicked down from 2nd to 1st to pick up speed. After that it has stayed in first when in drive.