I have a '51, 3100 with a '58 235 and SM 420. I pull a 775 pound Teardrop Trailer with about 400 pounds in the bed of the truck.

I used the Engine RPM calculater ( http://www.csgnetwork.com/multirpmcalc.html ) and using 1.71 as a final drive ratio, at 40 mph, I get an engine speed of 2914 rpm.

2 questions: Is the 3rd gear ration for this tranny 1.71?

Can I go as high as 3200 rpm for short periods if NEEDED for slowing on hills?

Thanks for any input.


Half Ton Will Travel
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