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| | | Forums66 Topics128,138 Posts1,056,751 Members48,454 | | 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
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| | | | Joined: May 2010 Posts: 10 New Guy | | New Guy Joined: May 2010 Posts: 10 | I had a local mechanic shop tell me that I could change out the gearing in the rear end to improve driving since I won't be using this truck for extremely heavy use. Does anyone have some advice on this? | | | | | Joined: Jan 2008 Posts: 4,962 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,962 | What series GMC is it. Different sizes had different ratios to begin with. If its a 100 series, you would now have a 4.11. Aftermarket 3.55 is available. | | | | | Joined: May 2010 Posts: 10 New Guy | | New Guy Joined: May 2010 Posts: 10 | It's a 1 1/2 ton with a 2 speed rear. | | | | | Joined: Jan 2008 Posts: 4,962 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,962 | Could be a 5.17/7.15, 5.83/8.10 or a 6.33/8.81. There are no aftermarket ringsets made for these. If you have the slow ratio, all you can do is find a donor truck with the faster gears. | | |
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