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Old 01-18-2020, 01:17 PM   #4
1976gmc20
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Join Date: May 2015
Location: Montana
Posts: 3,696
Re: K20 with TH350/NP205

Quote:
Originally Posted by mattshea125 View Post
Looking for some input from anyone with a 3/4 ton 4x4 that is running a TH350 / NP205 transmission.

I have a 1978 K20 with this transmission / transfer case combo and will be putting a stock 454 big block in place of the tired 350 this year.

The transmission currently functions perfectly, but I am wondering if I should swap it to a TH400 / NP208 or just rebuild what I have so I don't have to change my whole driveline around.

The truck is used for weekend driving, picking up mulch and some towing, nothing too crazy. I rarely if ever take it off road or beat on it.
Well, I used to have one … a long time ago.

The TH350 was the weak point of the whole pickup, and I traded it off for a 4 speed.

The NP205 that you have is the strongest transfer case, though not the lowest geared.


Why don't you just rebuild the 350 V8 ???????
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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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