Originally Posted by Jim Sears
...were stock '48 2 tons running 60 mph at only 3500 rpms in the day?
A gear/speed/RPM calculator will help answer that question.
I like this one
http://www.onlineconversion.com/bigger_tires.htm
6.13 gears and 35" tires give 3500 rpm at 60 mph, if that is the original tire diameter then yes.


•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-