I think truck and car requirements for gearing differ due to weight and general use of the design. To get the same power to weight ratio requires different horsepower and gear ratio for same affect. That's why GM didn't even offer 3.08s or 3.73s in 3/4t trucks
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Originally Posted by rsavage
I put a 200 4R in the 70 Burb I had with its stock 3.07 gears ( stamped 43/14 = 3.07)
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Like I said, not much difference. 43 divided bt 14 comes out a bit more than 3.07 and I guess GM decided to round it up for trucks because that's what GM calls them...3.08s. Just keeping the terminology the same as GM is the only reason I brought it up. The Dana 44 in the front of my 4.10 rear K2500 is marked 4.09 on the ID tab. The Dana 60 rear is actually 4.11.