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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
 

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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.
 

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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.

mod edit = not true

if each flywheel was balanced as a rotating assembly you couldn't just go to ford parts and by a new one
 

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Discussion Starter #4
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
 

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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.
 

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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"
 

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Sorry to jump in Fellas ! But a Google search led me to this post and it is Great News if it's True ! I blew my 2010 trans this week ! A good friend just swapped a Cummins setup into his 05 F350 ...he has his factory trans in great shape with less then 70k miles on it . It's mine if I need it for Free! But it's an 05 and mine is 2010 ! Seeing some I'm saving A lot on the free trans I don't mind buying Few necessary parts for it ...I already figured I'd swap a fresh front pump and converter into it . My truck is already complete so I should have the correct flywheel for the converter ."is that it ??? Can I use my flywheel and correct converter for my truck on a 2005 5R110?? That would be Such a Lifesaver !! Thanks for any help !
 

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Sorry to jump in Fellas ! But a Google search led me to this post and it is Great News if it's True ! I blew my 2010 trans this week ! A good friend just swapped a Cummins setup into his 05 F350 ...he has his factory trans in great shape with less then 70k miles on it . It's mine if I need it for Free! But it's an 05 and mine is 2010 ! Seeing some I'm saving A lot on the free trans I don't mind buying Few necessary parts for it ...I already figured I'd swap a fresh front pump and converter into it . My truck is already complete so I should have the correct flywheel for the converter ."is that it ??? Can I use my flywheel and correct converter for my truck on a 2005 5R110?? That would be Such a Lifesaver !! Thanks for any help !
Thread revival!
Yes it's a direct swap, I wouldn't bother changing the front pump, I would get a new 6.4 converter as yours is likely contaminated from your transaction failure, the 6.4 converter will go right in the 6.0 trans.
Also your 6.4 pan and filter are better so I would put the pan and (new) filter on the 6.0 trans.
 

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Portcity you seem to be everywhere and have so much useful information. Although this thread doesnt pertain to me I do appreciate you sharing your knowledge with the rest of us! Could you possibly chime in on my thread about tires on our duallys if you have an answer?
 

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Wait doesnt the above post say that the fly wheels are different? So if my trans goes south, i can get another 03 tq converter and an 08-10 trans from a yard and itll work?
 

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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.
I know this is a 6yr old quote, but where the f**k did this info come from!?!?

These are internally balanced motors. The flywheel/flex plates are balanced to themselves. They have no bearing on the internal balance of the motor. It is perfectly fine to swap flywheels or plates.
 

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Portcity you seem to be everywhere and have so much useful information. Although this thread doesnt pertain to me I do appreciate you sharing your knowledge with the rest of us! Could you possibly chime in on my thread about tires on our duallys if you have an answer?
I can try, where's the thread at?
 

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Wait doesnt the above post say that the fly wheels are different? So if my trans goes south, i can get another 03 tq converter and an 08-10 trans from a yard and itll work?
The flex plate (flywheel) is only different because the 6.0 converter has 6 studs and the 6.4 has 8 studs to mount it to the flex plate. Yes a 6.0 converter will work fine in a 6.4 trans.
 

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I know this is a 6yr old quote, but where the f**k did this info come from!?!?

These are internally balanced motors. The flywheel/flex plates are balanced to themselves. They have no bearing on the internal balance of the motor. It is perfectly fine to swap flywheels or plates.
I remember reading somewhere the early 03's were external balanced, but I never could confirm it....that's why I bought a billet 6.0 converter to mate with my 6.4 trans, I didn't want to risk it.
 

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What are the guys doing when they swap to billet flex plates then? Rebalancing the whole bottom end? Sounds silly.
 

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I am fixing to put a a 6.4 tranny to a 6.0 motor, did any one ever do it on this thread????
There are only 17 replies.....read the thread.
 

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Well I gathered he did and the 17 replies doesn't really give a Yes or No answer to anything other than discusses 6 holes and 8 holes and torque converters... Nobody ever truly answered the question as to the way I read it....
 
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