Hi campbell45, welcome to Stovebolt. Go to the GM Heritage site and you will find dimensions for your truck. I can measure my rear axle if want but might not be relative to what your looking for, I have a 1957 two ton (5000) (50) series with a single speed rear end.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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