Mad Dart said

You don't need to go all crazy for a 904 to handle the power you are going to be putting through it. Just remember that. People get all caught up in all these exotic parts etc when it is not necessary. If you want the low gear set that is your choice. I have a a999 that is tore down in my shop right now that has the Low gear set but it only had 4 clutches in the front drum. So take that for what it is worth.
The 904 that I built I copied and used the parts that were recommended to me from guys I know that have been successful racing. The parts I was told to use will easily handle more than most would ever put through it. From how hard they run their cars I do not doubt them for 1 bit. Cost of parts was somewhere in the $500.00 range not counting the Valve body or Converter. This was the first one I have ever built and I probably got maybe 6 Hours total into it from tear down to painted…. Done.
What you will find out is when you go to get the parts, no single vendor will have them all. I would also say stay away from the BIG name brand guys because they will for sure take all your $$ for the exact same thing you can get down the street for a lot less. There is no magic to building one of these transmissions but most will try and brain wash you & will try to get you to believe different.

Also there is no need to find a certain year transmission for the 5 clutch front pak. Use the thin Reds and steels to make your own 5 Clutch front Drum. This is what I did. Simple easy.

This should be plenty of info on where to get the parts and at least get you started.

Pump Gears** $36
http://www.tcsproducts.com/products/product/13/

24 Spring* $105
http://www.tcsproducts.com/products/product/15/

Billet Strut* $19
http://www.tcsproducts.com/products/product/618/

Rear Kevlar Band* $18
http://www.oregonperformancetransmi...OD&Category_Code=904&Product_Code=PTB-12820AK

Kevlar front Band $19
http://www.oregonperformancetransmi...D&Category_Code=904&Product_Code=PTB-12905F-K

Servo** $17
http://www.oregonperformancetransmi...ROD&Category_Code=904&Product_Code=SNX-22912A

Makco 904 page.* thin clutches/steels & Kits
http://www.makcotransmissionparts.com/A904.html

WIT trans, teflon seals, trans exploded view
https://www.wittrans.com/search.aspx?SearchTerm=12175ct
https://www.wittrans.com/Schematic.aspx?Transmission=A904

Valve body of your choice and Lever to match.
http://tranzactofindy.com/index.html

Converter…. Call a good vendor and have it custom made for your application.
Lenny at Ultimate has xlnt customer service and does great work.
http://www.ultimateconverter.com

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70aarcuda said

Got 4 904 racing and they are basically done this way....I use Transbrakes from Tranzact of Indy....

Some had low gear sets in them...some did not....depends on car combo.....a small engine heavy car will want the low gear set....or if you can not run alot of gear in the rear..the low gear set can make up for that somewhat.....

The 71 Dart 360 in my signature is bascially making 500 hp based on its weight and performance...and it has a 904 with 5 stock clutch disc in a 4 disc front drum......you dont need aluminum drums...the 904 is not prone to exploding like a 727 due to the smaller mass of the drum....the 904 sprag is riveted into the case not pressed in as the 727...so you dont need a bolt in spraq....you can change out the roller and springs for 5 bucks....

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