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Old 02-15-2021, 09:35 PM   #14
1976gmc20
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Join Date: May 2015
Location: Montana
Posts: 3,696
Re: 6 speed suddenly rough shifting

Quote:
Originally Posted by Palf70Step View Post
Not the first time I have heard of that Tim. It seems to be pretty common in the 6 speeds.
Yeah ... now I hear about that

Any idea what precipitates that? I thought these 6L90's were supposed to be super strong?

The first owner reportedly had a tool bed on it but the hitch receiver looked unused. All we did was tow a 6x12 U-haul about 700 miles, and highway driving to town and back.

Funny, despite all my complaints I never had a TH350 totally quit me. They would just get weaker and weaker. That's the main reason I traded in my 73 K20 years ago. It leaked fluid back into the transfer case, and one morning it wouldn't go, but I added a couple quarts of Dexron and away we went. I drove it several more years after that before I traded it.
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Current/past Chevy/GMC trucks:
1958 Chevy C-60; 1965 GMC C-50; 1965 Chevy C-10; 1971 Chevy K-10; 1973 Chevy K-20; 1976 GMC C-20; 1977 Chevy C-10 Suburban; 1980 Chevy K-10; 1989 Chevy K1500; 1991 GMC V1500 Suburban; 2016 Chevy K2500 HD

Other vehicles: 1988 Jeep XJ; 2011 Toyota 4Runner
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