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Discussion Starter #1
Hello all, seeking advice regarding my 2002 LB7 with 300k. When the truck gets up to operating temperature, it seems to slip out of 4th and 5th gear when I push it much over 2000 RPM’s. Sometimes it doesn’t shift into 5th at all, and when it is cold it will cycle through all gears regularly. As much as I would love to justify a trans build, I’d sure feel silly if it did not fix my issue. Feedback is greatly appreciated
 

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Welcome to DieselPlace
The first thing to do is check for any codes with a scanner.
Make sure that you have a scanner that can read TCM codes.
If you find any, post them here
 
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