4L80e temperature

[twisted60]

What should be normal operating temperature of a 4l80e transmission ? I went for a 10-15 min drive and crawled under Humvee after and transmission pan was very hot, I’ll try again tomorrow and get some temperature numbers with my temp gun.
Thanks


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[Mogman]

170-190, as a general rule anything over 230 is big trouble.
Do you have a working trans light????? if the TC is not going into lockup it will heat quickly, in fact the trans should not go into lockup until it is at operating temp.

 

[twisted60]

Yes trans light works. What should I check to see if TC is working correctly ? I’ll go back in manuals and try to find an answer.
Thanks


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[Mogman]

You are probably OK, the trans does run pretty hot, like touching the radiator.
If you suspect anything you can see if you have any codes, not all codes set a trans light on when running.
Here is the troubleshooting guide in case you do not already have it.
Also disconnecting the batteries erases the codes.

 

[twisted60]

Thanks, yes I have that manual. Trans light comes on when run switch is turned on and goes out when engine starts. I’ll check for codes to be sure.
Thanks


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