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rotorwrench · 06-16-2013, 10:06 AM

The transmission gears were redesigned for the 1951 model year. Gears will swap in the transmissions for 51 up to a certain degree but not in all applications. The R10 and R11 Borg Warner electric overdrives were used clear up into the 60s. The R11 was solid enough to work with the FE block motors and are the strongest of the series. R10s work just fine behind flatheads. Any of the transmissions from 1951 up to 1956 or so would be good candidates as long as they have the correct input shaft to work with the 8BA type clutch.

06-16-2013, 10:06 AM	#2
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,440	Re: overdrive options for 1953 f100 The transmission gears were redesigned for the 1951 model year. Gears will swap in the transmissions for 51 up to a certain degree but not in all applications. The R10 and R11 Borg Warner electric overdrives were used clear up into the 60s. The R11 was solid enough to work with the FE block motors and are the strongest of the series. R10s work just fine behind flatheads. Any of the transmissions from 1951 up to 1956 or so would be good candidates as long as they have the correct input shaft to work with the 8BA type clutch.