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#3
11-08-2003, 10:16 PM
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the 904 is a good transmission and with a few simple mods, like new spraque clutch and more clutches in the Low reverse and the intermediate clutch packs. I know of 800 horses going through a 904 with just a few mods. The gearing is different in the 904 than the 727. The planetarys are different.
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#5
11-09-2003, 12:37 AM
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Keep the 904
727 is heavier but takes more abuse than the 904. 904 is a little underated and I feel it can take more heat than people think, maybe because they replace it with a 727 before they give a real test
 But I would rather a 727 just because I know my style of driving and it doesn't say "HD" for nothing, it's a big boy for big motors  By the sounds of it you won't be aiming for any national records at the strip so I guess it will be a moderate to stock car so you have absolutley nothing to worry about, the 904 will take everything and-then-some Afew simply TCI or B&M even MP wouldn't do any harm even just to give the tranny something to play with Remember nothings bullet proof everything has it's day where things can break 
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#6
11-09-2003, 02:44 AM
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I've killed many A904's behind very mild 318's before so I know they dont hold up to a lot of abuse and drag racers pull there's down often for checks and rebuilds. And dont ever put any b&m junk inside of your tranny. Stick with TCI at www.tciauto.com . You want find better tranny pieces for your mopar elsewhere.
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#7
11-09-2003, 05:22 AM
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There are also guys who have had 30-40 hard runs with decent hp-Torque and they have had no trouble with there A904, I would also go TCI, well in fact I have already got a TCI valve body kit
But there are also guys out there who say TCI is crap, I guess everyone has there own thoughts on the TCI vs B&M topic.........one that will never get solved
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#10
11-09-2003, 04:18 PM
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Buddy of mine did 75 4000 RPM neutral drops on a 904 before it died.
904 is supposed to be able to shift 3/100 of a second faster than a 727.
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#11
11-09-2003, 05:03 PM
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No wonder it tore up Your not susposed to rev it and drop it in gear. He's very lucky the sprag did not brake nad teh tranny explode and take him to the grave or at least to a local hospital. Some people dont need a car or a lic. if they dont know what they are doing and he did not know what he was doing.
3/100 = .00001 gain in ET so it's not worth the use and they can fail easily.
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#12
11-09-2003, 06:07 PM
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Sorry, DWC. But 3/100 is .03 sec., which is about 3 car lengths @ 100+ MPH.
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#13
11-09-2003, 06:49 PM
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I've heard that the 904 is great for your stock ride on the street or modified for full race abuse, but not much in between. While a 727 would be prefered, a 904 will hold up just fine if you have the proper clutches, bands, etc installed. I think the main thing is to make sure you have the proper amount of stall for the motor build, gearing, and weight of the car. I would get a hold of Bill Reilly over at BigBlockDart.com as he is MoPar trans specialist and can honestly answer question about trans performance, stall selections, etc. Would be nice to have a bit more info about the car and driving styles to really give you a proper answer...
Good Luck
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#14
11-10-2003, 10:03 AM
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In the end, the question is what kind of combo do you have.
I am using a 904 in my combo and the car runs low 12's. I think in the 11's next year when I get the traction problem worked out. I use a manual valve body and good frictions/plates/Kevlar bands with no problems whatsoever. I pulled the pan mid summer and there were no shavings/sludge at all in it. DWC: were these stock style 904's? Were they worn prior to you grenading them? I think anything using a kickdown setup in a performance application invites untimely wear. Oh, the vehicle weight/power ratio of the car will have a major impact on wear. Keep that in mind too. In the end, if you buiild a 904 correctly (I built mine for under 500 bux) it will survive. Personal experience tells me.
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#16
11-10-2003, 10:33 AM
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math?
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#17
11-10-2003, 12:58 PM
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[QUOTE]Originally posted by FASTDARTCHESTER
DWC: were these stock style 904's? Were they worn prior to you grenading them? I think anything using a kickdown setup in a performance application invites untimely wear. Oh, the vehicle weight/power ratio of the car will have a major impact on wear. Keep that in mind too. They were stock and fresh other than one with a shift kit installed. If we use auto's now we use TCI built A727's or there parts. We have had real good service from them unlike the b&m crap that seems to either never work right or never hold up under stress. I have no problems with math,physics, or chemistry either not that it matters.
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#19
11-10-2003, 09:29 PM
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No Sweet!
Quote:
No worrys!! Just keep it mechanically sound and tuned you won't have any problems.
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#20
11-11-2003, 12:55 PM
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I like a trans blanket and a drive shaft loop to keep unwanted visitors where they belong.
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#22
11-20-2003, 07:23 PM
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KEEP the 904 that you have........in something that you have now - it would probably be almost 2 tenths slower with the 727.
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#23
11-20-2003, 07:26 PM
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Quote:
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#24
11-21-2003, 03:02 PM
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Check out Cope Racing Transmissions at www.coperacingtrans.com -sounds like they can make a 904 as bullet-proof as need be, plus you save weight. I plan to take mine to them, but won't get to it for a while. Good luck,
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#25
11-21-2003, 03:31 PM
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Quote:
IF they had a EZ bolt-on 904 behind an RB motor....I would do-it in a NY minute !!
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#26
11-21-2003, 03:39 PM
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people can theorize forever, but real world is what counts.
Its all relative to your application. Would running a stock type 904 behind a 400 hp smallblock in a 4000lb car be a good idea? no! A race built 904 behind a 400hp smallblock in a 2500 lb car? YES I love my 904. No problems after a full season of hard runs. The car runs low 12's and when traction problem is solved, i will be in the 11's (next summer).
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#27
11-21-2003, 03:57 PM
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Real world and the 904 ?
T/SA BIG Fury wagon(4900 lbs) with a 318 with a 904. Runs well under the index and was a National record holder for years. He has WON several National events in STOCK and has placed in the top-five IN the WORLD points. He has had this trans IN the car since the mid-80's with many MANY hundreds of runs on it. He has updated the converter a couple of times but has NEVER pulled the trans. There was never EVER any need to. Is a 727 a more HD trans ?....yes. Is it necessary?....to some - it IS. And that is OK ! BTW - the trans and converter are Turbo Action items.
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#28
11-21-2003, 04:00 PM
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Power output of the Fury? Track numbers?
I too use Turbo Action goodies. TD
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#29
11-21-2003, 05:34 PM
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best ET's around 13.60's and low 70's.......
horsepower?.......??? ..... 400 or so ???
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#30
11-22-2003, 08:48 AM
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My 904 lasted for several years behind the 460 flywheel HP 360, in the end it died, the fault was a problem that could have happened to a 727 also, going on that experience I still have an open mind on the issue
My car weighs 3,400 lbs The 904 has the advantage of quicker ET's ( slightly )
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904 vs 727
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