rear gear ratio


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By lawdogg1 - 13 Years Ago
Does anyone know what the rear gear ratio is for a 56 ford f100 with a 272 and manual three speed tranny? I cant seem to locate the info anywhere. thank you
By lyonroad - 13 Years Ago
Lawdogg when I got my '56 M100 (should be the same as a F100) with the Dana 44 Rear end I calculated the rear end ratio. My notes say "3.91:1" then it say "3.93:1 Approx". One of these numbers could be the one I calculated and the other could be the actual. Hope this helps a little.
By Carson - 13 Years Ago
one way to figure  rear gear ratio is  mark drive shaft and give the tire one full turn

counting the rotation of the drive shaft

giddy up

By lawdogg1 - 13 Years Ago
thanks guys, but carson what do you mean by the counting the rotation of the drive shaft?
By lyonroad - 13 Years Ago
Hey Lawdogg I just looked in my shop manual and it gives three ratios. One is 3.92:1 which is close to my calculation for the Dana 44 behind a 272 with the three speed. The other two are 4.27:1 and 4.09:1.
By wellcraft17 - 13 Years Ago
My 56 f100 with a 3 speed and 272 came with a 3:73 and it's stamped on the nomenclature plate.
By MoonShadow - 13 Years Ago
You are counting the revolutions that the drive shaft makes in one turn of a tire. For example if the driveshaft turns 4 times in one turn of the wheel your gear would be about 4 to 1. Etc. I currently have a 3:80 in my 56 Fairlane and plan to put in a 4:10 (actually 4:9) in the spring. Chuck
By stuey - 13 Years Ago
my 56 came with 3.73 but had a fordo... its on the plate just inside driver side door also on little alloy tag on diff.

if thats any help

stuey