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Driving '91 GM electronic speedometer from a US Shift Controller

Hi, I recently installed a US Shift transmission controller on my 1991 GMC C3500 with 4L80E. It works great, and solved a problem 3 shops couldn't diagnose or fix. In any case, I still cannot get my stock electronic speedometer to drive. The Quick 2 controller has a speedo output wire to connect...
- Gary Gable
- Thread
- Oct 8, 2022
- Replies: 23
- Forum: Transmissions
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Problem with '91 4L80E

Hi Folks, I have a '91 C3500 GMC Sierra with a 4L80E with 70K original miles on the truck. Bought surplus from a nearby municipality at 56K. About 6 months ago I began experiencing a loss of 4th gear. I took it to 2 different reputable transmission shops. Since it was intermittent and...
- Gary Gable
- Thread
- May 22, 2022
- Replies: 24
- Forum: Transmissions