Transmission changeover

Asked by ivangodwin55 Jul 14, 2023 at 10:33 PM about the 1994 GMC Sierra 1500 C1500 SL Standard Cab SB

Question type: Maintenance & Repair

Can I replace my electronic transmission with a vacuum transmission in my
1994 gmc sierra

4 Answers
38,915

beatupchevy answered 9 months ago

It's usually best to go with what the vehicle was designed for , Replacing an old worn tranny with an old worn tranny makes little sense

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307,225

Gene answered 9 months ago

You can but with quite a bit of difficulty. You fuel mileage will suffer greatly, the check engine light will be on all the time, among other problems. Not worth doing really.

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155,195

james answered 9 months ago

Since this is an OBD I vehicle I'm not sure if the check engine light will come on. I don't think the ECM monitors the transmission. But fuel economy would probably suffer and modifications would need to be made for the older transmission to fit. Personally I don't think it's worth it. Hope that helps! Jim

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