According to 6066 GMC trucks It could have been a 3.07:1, 3.54:1 or 3.92:1.

You can figure a close guess by jacking one wheel off the ground and count how many times the driveshaft rotates with 2 full turns of the wheel.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.