Mechanics

GMC SIERRA GAS PROBLEM

1986 GMC Sierra • 129,000 miles

Driving my transmission shifts to over drive at 30mph and down shifts as soon as I let off gas. WHAT IS CAUSING THIS/
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Guest
October 25, 2012.




Have a trans guy look at this, it may be a govenor stuck or a modulator depending on which trans. It can also be an internal trans problem like a valve.

Hmac300
Oct 26, 2012.


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