Try this link for an RPM calculator. http://www.ringpinion.com/Calculators/Calc_RPM.aspx

I've purchased a GM 14 bolt rearend for use in my 54. A 14 bolt Dually rearend basically has the same Wheel mounting surface width as the oem Eaton.

I'm with BZTGUY on having a rearend that has parts readily available. GM started using the 14 bolt in 73 and is still using it and Ford has been using one or other variation of the Dana for probably 50 years. Just something to think about.


1954 3600 Chevy Truck
"The Fake Truck"
In the Stovebolt Gallery
More pix on Photobucket