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Click on image for the lowdown. 
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| | | Forums66 Topics128,164 Posts1,056,982 Members48,458 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | The most common fix is to install the "pumplin" from a 1967 to 72 3/4 Ton truck with an automatic. They had a ratio of 4:10. I did this swap and I can drive at 60 mph with no problem. I also have tall 16" tires on mine. Here is a writeup on the procedure: Old GMC.com Site Article | | |
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