Gears won't change
1990 Chevrolet 1500 Pickup

Gears Won't Change

(1990 Chevrolet C1500)
After taking off on drive, I drive to 20 to 30 MPH and the transmission won't change. It will get stuck and will not pass 30 mph. The trans fluid is good.
1 answer & 0 comments
Popular Answer
on February 03, 2010
If the fluid is good, then you could have a vacuum modulator or throttle valve issue. If you don't know how to check these items, get a good repair manual (http://bit.ly/mitchell_repair_manuals_online) or take it to a transmission shop (http://bit.ly/transmission_data)
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Automatic Transmission Diagnosis
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on February 03, 2010
If the fluid is good, then you could have a vacuum modulator or throttle valve issue. If you don't know how to check these items, get a good repair manual (http://bit.ly/mitchell_repair_manuals_online) or take it to a transmission shop (http://bit.ly/transmission_data)
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