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4L80/85E Transmissions. 6L90 Transmission Discuss the 4L80/85E transmissions found in the 6.2/6.5L equipped vehicles and Duramax equipped vans. 6L90 discussion.

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Old 07-30-2016, 03:56 PM   #1 (permalink)
Rileyfboyce
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93 6.5 turbo diesel overdrive issuses

Hey everyone new to the page. But im having a problem with my 93 6.5 turbo diesel loosing overdrive as soon as the truck warms up. And cant get it back untill the truck is cooled down again. I have replaced my shift solenoids A and B inside the transmissiin but that didnt help it at all and i dont know what to do now im stuck. And need my truck back and able to drive freeways. Thanks in advance guys

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Old 07-30-2016, 06:08 PM   #2 (permalink)
OkDually
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Quote:
Originally Posted by Rileyfboyce View Post
Hey everyone new to the page. But im having a problem with my 93 6.5 turbo diesel loosing overdrive as soon as the truck warms up. And cant get it back untill the truck is cooled down again. I have replaced my shift solenoids A and B inside the transmissiin but that didnt help it at all and i dont know what to do now im stuck. And need my truck back and able to drive freeways. Thanks in advance guys
Welcome to the forum.

Have you read through this thread regarding the no overdrive issue?

https://www.dieselplace.com/forum/57-...-how-deal.html

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Old 08-16-2016, 09:25 PM   #3 (permalink)
Jess_sr
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You need a scanner to see if your computer is commanding 4th.
If it is then you have a hydraulic problem, if it's not you have a control problem.
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