What is the difference between the 727 and the 904 transmission?

[Grizzly]

Good points and bad points would be nice information. I get the impression from different topics on this board and others, that the 727  is the preferred one, why is that? Thank you.

[Khyron]

from my understanding, the 727 can take a hell of a lot more punishment. I think it's also a longevity issue....

but for the technical aspects of it, i'm sure someone will give you a better responce, and your talking about me aren't ya?

also
http://www.allpar.com/mopar/torqueflite.html

[Grizzly]

, and your talking about me aren't ya?

  No, actually our topics happen to be coincidental.    I read down through yours before posting mine to make sure mine wasn't a duplicate. Your thread gave me some information but didn't quite answer what I needed. It sounds like that most big blocks were mated to 727 transmissions, whereas the 904 was primarily for small blocks. That way they could handle the torque/horspower output of the larger engines. Does that sounds about right?

[golden73]

The 727 was the only available automatic transmission for big block cars. You could get a 727 for a small block, which where mostly for 340's and 360's or you could get a 904 which was primarily for the 318.

727 is a much heavier duty transmission and can really take a beating. I had a 904 behind a mild 360 and needless to say that didn't last long.
One good thing about the 904 is that it weighs less than the 727.... helpful if you are a racer

[Chryco Psycho]

the 904 weighs less but hat is not the whole story , the internal parts are lighter allowing less drag from inertia so the 904 will spin up faster with less mass which can b e an advatage in a race car but you will be rebuilding it more often

[Grizzly]

the 904 weighs less but hat is not the whole story , the internal parts are lighter allowing less drag from inertia so the 904 will spin up faster with less mass which can b e an advatage in a race car but you will be rebuilding it more often

Would it still be reliable for a mildly built up 318? I am not going to be racing, but would like a little giddy-up when I needed it, ya know?

[Plumcrazy]

Would it still be reliable for a mildly built up 318? I am not going to be racing, but would like a little giddy-up when I needed it, ya know?

For that purpose a properly rebuilt 904 should be fine.   If it's a heavier B or E body car you might also consider a low gear set for better acceleration from a stop

[ck1]

the 904 weighs less but hat is not the whole story , the internal parts are lighter allowing less drag from inertia so the 904 will spin up faster with less mass which can b e an advatage in a race car but you will be rebuilding it more often

WOW this is rare, i never thought you would stoop so low to talk about automatic transmissions LOL mister 4 speed man

[Ghoste]

He was only relenting to do it in a racing context so he's still safe. 

[Chryco Psycho]

  Sorry won`t happen again

[Rolling_Thunder]

the reduced weigh of the internals of the 904 also make it more efficient than the heavier 727...  when built correctly a 904 can handle alot of abuse

[Grizzly]

Well this would be for a 73 CHarger SE Brougham with a 318/904 combo, so I was curious to know how good the combo was? The last Charger I had, had a 318/727 combo and I didn't know if that was normal or not. Thanks folks! 

[Rocky]

The 727 could be had with the 318 if it were a towor heavy duty combination, but it was pretty rare.  If you plan on sticking with your 318 the 904 can handle most of the upgrades that your motor can.