727or 904

[Moparstyle]

whats the strongest trans between the two trying to figure out what way to go ive heard good things about them both

 

[66Satellite47]

The 727 is stronger. 904 has less rotating mass, therefore less "parasitic loss".

 

[PurpleBeeper]

727 all day long....unless it's a bone stock 318/273 for cruising only.

 

[bobtile]

http://www.hotrod.com/articles/mopp-1301-904-torqueflite-transmission-new-old-school/

 

[Moparstyle]

I read that article thats what got me thinking what was the best way to go

 

[gtxracer]

I read that article thats what got me thinking what was the best way to go

As 66Satellite mentioned, with less rotating mass and smaller internals, you might run a bit quicker but the 904 won't last and if you don't mind R/R the trans, is it worth the hassle?? Just my thoughts!

 

[GetX'd]

The 727 is a solid trans - you won't go wrong with that one. Don't know much about the 904. Have beat the **** out of my 727 for decades now - rebuilt it once just because I was restoring the car and it was 45 years old, not because it was required.

 

[rumblefish360]

When the 904 was new, the racers of the day made the switch and stayed with the 904.

THAT! Should be telling you something.

My choice has been the 904.

 

[66Satellite47]

I'm always a little leery of the magazine "build ups" & this one seems very superficial in description of components needed to stand up to a 9 second Gen 3 Hemi. It depends on what your torque, power and intended use is. "Racers of the day" that switched from a 727 to a 904 were mostly the "class" racers that needed every .01 second at the track. They also tended to spend the money on the specialty parts needed to make a 904 even remotely close to a 727 in reliability. With a fairly mild small block, I suspect a 904 would be just fine.

 

[dvw]

The biggest issue with a 904 is cracked converter hub. If you convert the the pump to to drive the converter with flats on the hub instead of notches problem is solved. Use the multi spring front drum conversion. Besides that it wouldn't scare me in a 10 second car with stock parts and a good valve body. Now if you want to bracket race into the 9 second zone with no maintenance I'd use a 727.
Doug

 

[Moparstyle]

The biggest issue with a 904 is cracked converter hub. If you convert the the pump to to drive the converter with flats on the hub instead of notches problem is solved. Use the multi spring front drum conversion. Besides that it wouldn't scare me in a 10 second car with stock parts and a good valve body. Now if you want to bracket race into the 9 second zone with no maintenance I'd use a 727.
Doug

Thanks Doug

 

[Moparstyle]

I'm always a little leery of the magazine "build ups" & this one seems very superficial in description of components needed to stand up to a 9 second Gen 3 Hemi. It depends on what your torque, power and intended use is. "Racers of the day" that switched from a 727 to a 904 were mostly the "class" racers that needed every .01 second at the track. They also tended to spend the money on the specialty parts needed to make a 904 even remotely close to a 727 in reliability. With a fairly mild small block, I suspect a 904 would be just fine.

I’m going to run a 3rd gen hemi in my car thanks for your input

 

[Moparstyle]

Thanks guys for all your input and advice 727 is the way to go

 

[383man]

To me I would only run a 904 if I ran a class car and needed to run the fastest I can. Either to set a record or to be fast in your class in a heads up race. Otherwise I would use he 727 which I do on my street/strip car. I wanted low maintenance and good reliability in my street car. And I was not worried about the tenth or so faster the 904 can be. Ron