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Will the DRAC module keep the transmission from shifting?

Tiny
VAUGHN384
  • MEMBER
  • 1994 CHEVROLET 3500
  • 6.5L
  • V8
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
Replaced transmission (4l80e} still no shift after first. Transmission known to be good. ECM good. Unable to find seasoned techs with 1994 and earlier Chevrolet diesel experience.
Thursday, November 12th, 2020 AT 8:00 AM

3 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
It is possible. I attached some info on this. However, the more likely cause is the output shaft speed sensor not functioning properly. So did the new unit come with new speed sensors?

Let's also check and see if you have any codes and we can go from there.

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method
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Thursday, November 12th, 2020 AT 8:24 AM
Tiny
VAUGHN384
  • MEMBER
  • 2 POSTS
Thanks.
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Thursday, November 12th, 2020 AT 10:18 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
You are welcome. Thanks for using 2CarPros. Please come back next time you need some info.
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Thursday, November 12th, 2020 AT 5:56 PM

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