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99 Suburban Transmision Swap

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05-29-2009, 11:33 PM

Captainfab

60-66 Nut

Join Date: Mar 2007

Location: Coeur d'Alene, Idaho

Posts: 23,252

Re: 99 Suburban Transmision Swap

Quote:

Originally Posted by 1bcooper

99 Chv C1500, 4L60E transmission with cooler/towing, etc. I have blown three transmisisons.
*Can you replace the 4L60E with the heavier 4L80E?
Will the computer still work?

I am towing a 6000# Airstream.

The wiring harness for the 4L80E is different than the 4L60E harness. Plus as was already posted the PCM will need to be reflashed.

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