Will the DRAC module keep the transmission from shifting?

1994 CHEVROLET 3500
200,000 MILES • 6.5L • V8 • 2WD • AUTOMATIC
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VAUGHN384
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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.
Nov 12, 2020 at 8:00 AM
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KASEKENNY
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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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Nov 12, 2020 at 8:24 AM
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VAUGHN384
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thanks.
Nov 12, 2020 at 10:18 AM
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KASEKENNY
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You are welcome. Thanks for using 2CarPros. Please come back next time you need some info.
Nov 12, 2020 at 5:56 PM