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Re: 68 Chevy C10 Rear End Gears?
Correct, if it's an open diff the spider/side gears can screw up the math. I think they are 2:1, so if it's open, lift one tire, mark the driveshaft, turn the tire until the driveshaft has made a full rotation then divide by 2.
Most of these old trucks are probably due for a gear lube change anyhow, so pull the cover and visually confirm what gear ratio you have. Then refill with fresh lube. Your truck thanks you.
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44 Willys MB
52 M38A1
64 Corvette Coupe
68 Camaro 'vert LT1 & TH700
69 Z/28 355 12.6's @110
69 Chevy Short Step 4 1/2"/7" drop
72 Jimmy 4WD 4spd 4" & 35's
02 GMC 2500HD 4x4 Duramax
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