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1988 Sierra Transmission Problem


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K-Town990
New User

May 15, 2011, 9:49 PM

Post #1 of 2 (1593 views)
1988 Sierra Transmission Problem Sign In

I have a 1988 GMC Sierra with a 5.0 and around 130,000 miles. Lately it has been shifting a little rough so since I work at a Jiffy Lube, we replaced the transmission filter and the gasket. Now it won't shift out of first gear. I got it to second gear once but not third. I checked the fluids and they are all ok.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 16, 2011, 4:25 AM

Post #2 of 2 (1581 views)
Re: 1988 Sierra Transmission Problem Sign In

I guess you shouldn't have changed the fluid, huh?
The transmission has serious internal problems and changing the fluid just made it worse.



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