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Old 12-15-2002, 01:21 AM
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Default 727 vs. 904 - HELP!!

Hey guys and gals, really fast question about transmissions. Specifically speaking, mopar. What is the dignificant difference between the 727 and the 904. I've heard many people swear by the 727, and equally as many people swear by the 904. I was just wondering, as I really don't know, what the difference are and what personal prefernces are. Thanks for the help.

-Fox Deacon
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Old 12-15-2002, 01:50 AM
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A 904 can pull off a quicker shift than a 727 can so it's good for a mild drag car. The 727 is bullet proof. Almost. It's the only thing that was made for the big block and hemi cars. the hemi trans had a bigger drum with extra discs in it though.
The 727 is the perfered trans to race in most all aplications and can take a much more powerful engine than a 904 can,and much more abuse.
The best race and street trans are built by TCI. They also have all the shift kits,converters,fluid,flex plates and much more.
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Old 12-15-2002, 11:33 AM
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dwc : thanks a lot for the post. that basically cleared everything up. thanks again.
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Old 12-15-2002, 02:37 PM
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Welcome
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Old 12-15-2002, 09:57 PM
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.....and, because a 904 is physically smaller than a 727 and has smaller/lighter rotating parts, it will be .10 to .15 seconds faster in the 1/4 mile. (All else being equal-i.e.: converter stall/flash, gearing, etc.)

Just depends if you want a little more durability or a little better ET.
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Old 12-15-2002, 11:51 PM
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The 904 can't take nearly as much torque as a 727- it doesn't take more than a slightly warmed over 360 to break one. The main weakness seems to be the torque converter snout- they crack and break off causing a failure. The 727 is physically much stronger- heavier internal components, but it eats up much more power due to the extra rotating mass.
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Old 12-15-2002, 11:59 PM
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Default 904 vs. 727

As said by others, the 904 can't take as much as the 727 transmission. We are doing a restoration on my dad's 71 challenger, which had a 904. He bought a 360 crate motor with 380 horsepower. We put a 727 in the car, and we shortened the driveshaft 5 inches to accomodate the larger 727. Basically, the 727 was for the bigger engines; to take more torque and abuse from them
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Old 12-16-2002, 11:02 AM
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Well, you can't put down the 904 too much because it isn't THAT weak!

I have a 360/904 combo running mid-11's @113+ mph with mid-1.50 60' times.....and this is at 3530+ lbs!
Done properly, a 904 will take a lot of abuse. And I believe the converter snout breakage has more to do with the quality of materials/workmanship.

But since I need all the ET I can get, I'm willing to sacrifice a "little" durability.
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Old 12-16-2002, 03:15 PM
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Default im not downing it

Oh, im not downing a 904 at all.
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Old 12-16-2002, 03:17 PM
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Unhappy

sorry if it came across that way
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Old 12-16-2002, 03:27 PM
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sorry if it came across that way
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Old 12-16-2002, 03:35 PM
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jawbmx,
No problem. Actually, my post was directed more at what jeebis44 said!
But anything can be broken at any given time regardless of the design. And some people could just have bad luck with a particular item. Just trying to set the record straight from my end and people can then make their own final decision.
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