6.0 and 6.4 auto transmission differences

[rtm038]

According to the 6.4 and 6.0 bibles, the 6.4s use an 8-bolt flywheel/torque convertor set-up and the 6.0s use a 6-bolt flywheel/torque converter set-up. Also, it seems that the 6.0s TCM is integrated into the underhood ECM, while the 6.4s use a seperate TCM mounted to the frame. Other than these differences, are the transmissions interchangeable? In other words, if the transmission in my 2006 went south could I use the transmission (minus the torque converter) from a 6.4? Just curious.

Ryan

[Lubbockguy1979]

You either need to get a 8lug fly wheel and tc or a 6lug fly wheel and tc. You cannot missmatch the fly wheels and tc. Dependant on the year of the trannys in question will determine the differences. The tranny should work fine and bolt, and plug in though. The 6.4 has a different stall convertor so if one is better for you use that setup.

[ONAGER]

You want to avoid removing your flywheel... the motor is balanced with the flywheel in place, if you use a different flywheel you will kill the balance of your motor.

[rtm038]

I was just curious if Ford made any changes to the transmission itself when they went from the 6.0 to the 6.4. Since posting this topic, I have found out that the Torqshift used with the 6.4s features upgraded internals to handle the extra power that the engine puts out.

Thanks

[7.3dofbft]

a little bit old topic, but, so if a 6.0 tranny went south you could swap in a 6.4 and it could handle more power, seems pretty neat. THey also changed the pan and filter.

[pizza pig]

Originally Posted by rtm038

I was just curious if Ford made any changes to the transmission itself when they went from the 6.0 to the 6.4. Since posting this topic, I have found out that the Torqshift used with the 6.4s features upgraded internals to handle the extra power that the engine puts out.

Thanks

theyre the same with minor internal updates.. wont really hold "more power"