Originally posted by Steve_M
Does anyone know if there is a transmission out there that can be installed on a 351 Cleveland that has a 4 or 5 speed with overdrive? Even an automatic with overdrive would be acceptable. I have a '72 Mustang that I frequently take on the highway and am running 3500 - 4000 RPM's and burning a lot of fuel. I am looking for overdrive to drop the high speed RPM's.
assuming you have a c6 behind that 351C at the moment, you should just get an overdrive tailhousing from gearvendors
it will give you 6 speeds, in an auto