My Fire Engine has an Eaton 2-speed with 6.14/8.36 gears and will run low 60's all day long. I have 11.00 x 22.5 tires and it's powered by the 322 V8 with a 4k rpm governor.
My tow truck has the GM 2-speed with 6.40/8.72 gears and will run 65 mph. It has 10.00 x 22.5 tires, it's powered by a 350 sbc without a governor.
Mike B
