It is my understanding that factory equipped 55-57 pass cars had 3:36's for the powerglide, 3:55's for all 3 speeds except OD, and 4:11's for OD. 1/2 ton Trucks had 3:90's for 3 speeds and 4 speeds, and 4:11 for OD's. I'm sure that some special orders were made and of course many changes were made over the years. Trucks with 3:90's work great with OD's. I have installed OD's in cars with 3:55's and they make outstanding highway cruisers.
Fred
