What rear end?

[1972SUPERSB]

Originally Posted by IHeartGroceries

Thanks for the input! I am really starting to think that may be a real possibility. I know my grandfather wouldn't have done that when he owned it. But, seeing as my great uncle, the original owner, added saddle tanks and a trans cooler, so he could pull his horse trailers on his ranch, it really make sense. I'll have to grill my grandfather to see what he knows. I really presumed everything was factory (virtually everything else is), because of their traditional "if it aint broke, don't fix it" mentality.

There is a gear ratio calculator which you can google and will tell you what your ratio is. Just need height of tires. Need a tach to get accurate results.Or you can just jack up the rear end of the truck and note how many times the driveshaft turns in relation to the tire
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