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Old 08-26-2018, 11:28 AM   #1
Warrens69GMC
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Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,613
Rear axle options, 1964 GMC C2500

I have a friend who has a 1964 GMCc2500 longbed with leaf springs, and he is looking to upgrade the rear axle to a higher gear for better freeway driving.

Current setup per him-
1986 454
Th400
8 lug rear end, 5,13 gearset, leafspring perches
28 inch tall tires rear, 27 inch front tires

So we were thinking 3.55 or 3.73 gears, what can were use as a donar?
Maybe a 1973-1980 Suburban C20 with 3.73?
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