Re: 904 race trans
[Re: RTSE4ME]
#2939044
07/02/21 02:36 PM
07/02/21 02:36 PM
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Joined: Jan 2004
Posts: 8,249 fredericksburg,va
cudaman1969
OP
master
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OP
master
Joined: Jan 2004
Posts: 8,249
fredericksburg,va
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I just used the typical upgrade parts when I built mine a few years ago. RMVB, Alto Red Eagle racing clutches, Kolene steels, thicker band strut, red lined bands, teflon rings and rear billet servo. I did upgrade to an oem 5 disc drum and Multi-Spring Pack with Billet Retainer. No issues but my car is lite 2513 lbs. What kind of HP
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Re: 904 race trans
[Re: RTSE4ME]
#2939052
07/02/21 03:18 PM
07/02/21 03:18 PM
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Joined: Feb 2005
Posts: 20,172 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,172
PA.
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Jay is running low 9’s with his 904
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: 904 race trans
[Re: pittsburghracer]
#2939053
07/02/21 03:23 PM
07/02/21 03:23 PM
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Joined: Jan 2003
Posts: 8,022 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,022
Tulsa OK
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Mine runs mid tens at 3600lbs. Its got A&A red clutches, A&A spring pack, and a TA reverse valve body.
68 Barracuda Formula S 340
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Re: 904 race trans
[Re: cudaman1969]
#2939058
07/02/21 03:38 PM
07/02/21 03:38 PM
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Joined: Jan 2003
Posts: 8,022 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,022
Tulsa OK
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How often are they checked or inspected? I don't have a lot of data with mine. I maybe put 40 or so passes and drag week(got it really hot once) on it in 2018. I tore it apart in 2019 and looked at it and it looked great. It just had stock clutches and steels in it so I changed it to the red clutches and kolene steels because I wasn't super pleased with the 2-3 shift and the upgrade took care of that. I will probably not inspect it again until I have an issue I feel needs attention. I ran my 727 for close to 15 years on the same fluid and it still worked amazingly well. I made the move to 904 knowing I would go faster and maybe have to look it every season or two.
Last edited by Bad340fish; 07/02/21 03:39 PM.
68 Barracuda Formula S 340
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Re: 904 race trans
[Re: Bad340fish]
#2939074
07/02/21 04:50 PM
07/02/21 04:50 PM
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Joined: Jan 2004
Posts: 8,249 fredericksburg,va
cudaman1969
OP
master
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OP
master
Joined: Jan 2004
Posts: 8,249
fredericksburg,va
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How often are they checked or inspected? I don't have a lot of data with mine. I maybe put 40 or so passes and drag week(got it really hot once) on it in 2018. I tore it apart in 2019 and looked at it and it looked great. It just had stock clutches and steels in it so I changed it to the red clutches and kolene steels because I wasn't super pleased with the 2-3 shift and the upgrade took care of that. I will probably not inspect it again until I have an issue I feel needs attention. I ran my 727 for close to 15 years on the same fluid and it still worked amazingly well. I made the move to 904 knowing I would go faster and maybe have to look it every season or two. Same here with the 727, never had a 904 though, real world info from you guys
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Re: 904 race trans
[Re: cudaman1969]
#2939162
07/02/21 09:35 PM
07/02/21 09:35 PM
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Joined: May 2003
Posts: 13,188 aZLiViN
J_BODY
I Live Here
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I Live Here
Joined: May 2003
Posts: 13,188
aZLiViN
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I have a great 904 for a 400hp small block.... DON’T TRY THIS AT HOME! I have 67 passes on my 904 off the trans brake at 4K converter flash to 6100. We go 1.21 to 1.25 60ft on good tracks, and have been running 9 teens/.20s. ALL stock components with the exception of the A&A front spring pack, A500 flat drive gears in the pump, and front band. Both clutch drums have been cross drilled for fluid relief. I talked with Darren at Pro Trans and he was like... “I’d run it!” I’m hoping to do some major upgrades to it over our ultra short winter break. It’s a shame.... with the 727, small 598 intake, and 4150 carb it was a really consistent 9.5/.6 bracket machine! Sold the 727 and now I have to find homes for the converters Car weighs 2970 race ready.... “I don’t need a Pro Trans”..... EVERYBODY needs a Pro Trans!!
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Re: 904 race trans
[Re: J_BODY]
#2939194
07/02/21 11:23 PM
07/02/21 11:23 PM
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Joined: Dec 2005
Posts: 11,551 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,551
Fulton County, PA
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Multi spring pack. Blue Plates and Kolene. Rollerize the output shaft support if you are going to be spinning any RPMs (or even if you aren't). Convert to the late model converter hub and pump with the flats, As much billet as you can afford. Servos, drums,
If the results don't match the theory, change the theory.
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Re: 904 race trans
[Re: jwb123]
#2939261
07/03/21 10:23 AM
07/03/21 10:23 AM
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Joined: May 2003
Posts: 13,188 aZLiViN
J_BODY
I Live Here
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I Live Here
Joined: May 2003
Posts: 13,188
aZLiViN
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904's can blow up just like 727's same power flow just smaller lighter parts. http://tcsproducts.com/media/uploads/user-files/Drum_Tests_Jan_2017.pdfFailure to 904 drum “possible” but I’m betting the rpms required to achieve this phenomenon are up there with the aftermarket 727 parts due to its smaller size basically putting it above a threshold that we’d seldom see. In my conversations with a couple of shops that have been in the game awhile neither have encountered this happening to a 904.
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Re: 904 race trans
[Re: A727Tflite]
#2939262
07/03/21 10:28 AM
07/03/21 10:28 AM
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Joined: May 2003
Posts: 13,188 aZLiViN
J_BODY
I Live Here
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I Live Here
Joined: May 2003
Posts: 13,188
aZLiViN
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What adapter are you guys using to bolt it to a big block? I’ve never seen/heard of an “adapter”.... just the pro-flight internals in a 727 case. On my friends the front band adjuster is relocated (welded) so it’s not a total “bolt in” deal. Not sure what else is required as far as machine work. We just flew through it quick to inspect after a broken gear.
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Re: 904 race trans
[Re: cudaman1969]
#2939296
07/03/21 11:55 AM
07/03/21 11:55 AM
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Joined: Mar 2003
Posts: 2,498 PA
moparacer
top fuel
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top fuel
Joined: Mar 2003
Posts: 2,498
PA
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Thanks for all the input from everybody. Class-bracket-fun car, maybe high tens. 3190 to 3310 pounds A-body I had one I built in a mid to high 10 second car that was basically a stock 4 disc 904 with a run of the mill kit, valve body and kickdown lever that was in the car for years with no problems.
67 Barracuda street/bracket car 11.27-119 68 Dart 502 BB 8.70s-152 414 cid SB Dragster 7.65-174
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Re: 904 race trans
[Re: moparacer]
#2939338
07/03/21 12:48 PM
07/03/21 12:48 PM
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Joined: Aug 2003
Posts: 4,977 new jersey usa
11secdart
master
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master
Joined: Aug 2003
Posts: 4,977
new jersey usa
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Been running 904s for over 30 years only broke one and that was my fault due to a shifter adjustment gone wrong.. Good parts, Turbo Action manual reverse pattern valve body, 5 disc clutch , rollerized output shaft, etc. go thru it about every 5 years or so, I have two identical 904s one in car , one spare... 3150 lb. w/ driver 68 Dart 11.50s on a stop but capable of 10.60s
Last edited by 11secdart; 07/03/21 12:53 PM.
68 Dart 410 / 904 92 D150 original owner 21 Ram 1500 Quad Cab, Big Horn , Hemi ,4x4 23 Audi Q5 16 Honda HRV
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Re: 904 race trans
[Re: cudaman1969]
#2939448
07/03/21 03:06 PM
07/03/21 03:06 PM
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Joined: Feb 2005
Posts: 20,172 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,172
PA.
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What moved me away from 904’s many many years ago was the weak converter hub issues. It’s the only thing I ever hurt back then. I moved on to running 727’s and never looked back. And now everything I race has a powerglide and I couldn’t be happier as it’s nice having a SAFE aftermarket case.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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