Your stock ratio is 3.90:1 (but your R&P look bad). In order to use a 3.55:1 gear set, you'll need a differential case from a 47-53 1/2 ton truck. The optional 3.55:1 gearset won't fit on your differential case.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.