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Real 904 power limits #1378487 01/30/13 10:42 AM 01/30/13 10:42 AM
Joined: Nov 2009 Posts: 86 ms W w2dak394 OP member
w2dak394 OP member W Joined: Nov 2009 Posts: 86 ms	I would like to hear from those that have used 904's in some high hp applications. I also know it would be better to use a 727 so I don't need that info. Just wanting to know what it takes to make one live for a while. Will be behind 800hp small block, 3000lbs. Thanks in advance.

Re: Real 904 power limits [Re: w2dak394] #1378488 01/30/13 11:37 AM 01/30/13 11:37 AM
Joined: Dec 2005 Posts: 293 Kansas City Metro M mbogina enthusiast
mbogina enthusiast M Joined: Dec 2005 Posts: 293 Kansas City Metro	ProTrans is 904 guts in a 727 case. True that the 904 parts are the best available, aluminum, billet, etc., but these trans hold up fine at 1000+ HP and 600+ Tq in 3200 to 3800 lb Super Stock cars, ET's in the low 8's to mid 9's. Good parts will live fine. Be a Rebel- Break the Laws of Physics!

Re: Real 904 power limits [Re: mbogina] #1378489 01/30/13 12:33 PM 01/30/13 12:33 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	The question can be answered by another question,"How much money do you have?" R.

Re: Real 904 power limits [Re: w2dak394] #1378490 01/30/13 12:36 PM 01/30/13 12:36 PM
Joined: Feb 2011 Posts: 1,454 Glendora Ca. J Just-a-dart pro stock
Just-a-dart pro stock J Joined: Feb 2011 Posts: 1,454 Glendora Ca.	I agree with "MBOGINA" call Dave at Protrans about your combo 661-940-7400. "Just a Bracket car dressed up like a streetcar"

Re: Real 904 power limits [Re: mbogina] #1378491 01/30/13 12:43 PM 01/30/13 12:43 PM
Joined: Jul 2008 Posts: 30,424 Florida STAYcation dOrk ! The village idiot's idiot
dOrk ! The village idiot's idiot Joined: Jul 2008 Posts: 30,424 Florida STAYcation	Quote: ProTrans is 904 guts in a 727 case. True that the 904 parts are the best available, aluminum, billet, etc., but these trans hold up fine at 1000+ HP and 600+ Tq in 3200 to 3800 lb Super Stock cars, ET's in the low 8's to mid 9's. Good parts will live fine. uNder these applications ... don't they have to be freshed-up every 20 or so passes?

Re: Real 904 power limits [Re: dogdays] #1378492 01/30/13 01:11 PM 01/30/13 01:11 PM
Joined: Oct 2003 Posts: 1,409 Ont. Canada 10.90 Racer super street
10.90 Racer super street Joined: Oct 2003 Posts: 1,409 Ont. Canada	Quote: The question can be answered by another question,"How much money do you have?" R. If he has enough money to build a 800hp SB then he better have enough to buy a good trans, ect ect ect Protrans !!!!

Re: Real 904 power limits [Re: 10.90 Racer] #1378493 01/30/13 01:24 PM 01/30/13 01:24 PM
Joined: Oct 2007 Posts: 3,978 Hilltown Pa 1967dartgt master
1967dartgt master Joined: Oct 2007 Posts: 3,978 Hilltown Pa	You can try Rick at A1 also. increased line pressure, and harden input and output shafts. That is the horsepower level I was breaking out put shafts but with at little more weight 3350lbs. It can be done but expect to have 3500-4500 in your trans. I switched to a 727. Brett Miller W9 cnc'd heads STR Chassis fabraction

Re: Real 904 power limits [Re: w2dak394] #1378494 01/30/13 02:44 PM 01/30/13 02:44 PM
Joined: Jan 2003 Posts: 9,996 Frostbitefalls MN (Rocky&Bullw... gregsdart master
gregsdart master Joined: Jan 2003 Posts: 9,996 Frostbitefalls MN (Rocky&Bullw...	Quote: I would like to hear from those that have used 904's in some high hp applications. I also know it would be better to use a 727 so I don't need that info. Just wanting to know what it takes to make one live for a while. Will be behind 800hp small block, 3000lbs. Thanks in advance. A better question is how much torque will a 904 hold? Torque is what pushes parts to their limit, not hp. a 500 hp low rpm diesel would shredd a 904 in seconds. A 600 hp 340 cube small block in front of it, and it will live a very long life. A loose converter also helps, because the trans no longer gets hit with the harsh shifts of a stock converter that will bark the tires at 50 mph. My uneducated guess is about 500 ft lbs is a good range to stay at or below. Maybe one of the trans experts will chime in with some more input. 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: Real 904 power limits [Re: dOrk !] #1378495 01/30/13 03:46 PM 01/30/13 03:46 PM
Joined: Oct 2004 Posts: 1,752 detroit area M moderncylinder top fuel
moderncylinder top fuel M Joined: Oct 2004 Posts: 1,752 detroit area	Quote: Quote: -------------------------------------------------------------------------------- ProTrans is 904 guts in a 727 case. True that the 904 parts are the best available, aluminum, billet, etc., but these trans hold up fine at 1000+ HP and 600+ Tq in 3200 to 3800 lb Super Stock cars, ET's in the low 8's to mid 9's. Good parts will live fine. -------------------------------------------------------------------------------- uNder these applications ... don't they have to be freshed-up every 20 or so passes? no they dont,, a planetary could break after 100 or so runs though,, so its a good idea to look at it every so often if you run low line pressure you could burn it up,, a hemi car has about 150-175lbs

Re: Real 904 power limits [Re: w2dak394] #1378496 01/30/13 04:01 PM 01/30/13 04:01 PM
Joined: Aug 2003 Posts: 43,157 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,157 Bend,OR USA	Call Dave at Pro Trans and buy his all new Proflyte, no more problems with using any stock parts Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Real 904 power limits [Re: Cab_Burge] #1378497 01/30/13 05:19 PM 01/30/13 05:19 PM
Joined: Dec 2005 Posts: 293 Kansas City Metro M mbogina enthusiast
mbogina enthusiast M Joined: Dec 2005 Posts: 293 Kansas City Metro	we have found the reliabilty of the ProTrans to be excellent. We did break a gearset a few years back when we ran the Cuda at minimum 3810+ lbs and we were pushing 640+ TQ, and we killed the forward clutches in it late last year at the Heartland Park Topeka Division Race, but typically we will freshen it up every 100 runs or so and we have no problems. The Protrans 727 is a full 25 lbs lighter than a stock 727, and .25 quicker. Be a Rebel- Break the Laws of Physics!

Re: Real 904 power limits [Re: mbogina] #1378498 01/30/13 11:35 PM 01/30/13 11:35 PM
Joined: Nov 2009 Posts: 86 ms W w2dak394 OP member
w2dak394 OP member W Joined: Nov 2009 Posts: 86 ms	So if I'm understanding right u can install aftermarket shafts and drum, and stll break planetary gears. Would these shafts be called 300m shafts. What about the stock case will it be okay? If someone has a 904 built at home that will handle this power I would love to Speek with u.

Re: Real 904 power limits [Re: w2dak394] #1378499 01/31/13 01:06 AM 01/31/13 01:06 AM
Joined: Apr 2009 Posts: 3,415 Toronto M mshred master
mshred master M Joined: Apr 2009 Posts: 3,415 Toronto	Can't remember what thread it is on here, but I was doing some searching on here awhile back when deciding if I was going to run a 904 or 727 behind my SB and I believe someone had said that the limit for the stock shafts on these transmissions was 650-700hp??? After that they need some stout billet pieces to hold the power

Re: Real 904 power limits [Re: mbogina] #1378500 01/31/13 01:10 AM 01/31/13 01:10 AM
Joined: Jul 2008 Posts: 30,424 Florida STAYcation dOrk ! The village idiot's idiot
dOrk ! The village idiot's idiot Joined: Jul 2008 Posts: 30,424 Florida STAYcation	Quote: The Protrans 727 is a full 25 lbs lighter than a stock 727, and .25 quicker. Just curious ....what is the price of this setup ?

Re: Real 904 power limits [Re: w2dak394] #1378501 01/31/13 01:35 AM 01/31/13 01:35 AM
Joined: Jan 2003 Posts: 6,139 Melbourne , Australia LA360 master
LA360 master Joined: Jan 2003 Posts: 6,139 Melbourne , Australia	A 904 in a lightish car of say 3000-3200lbs will handle 500ft/lbs with most of the standard hard parts. 904's don't have the friction cross section that a 727, Powerglide or TH400 has, so they don't have the torque handling capability. A Proflite is a different trans to a 904. It's a 727 AMC case, with custom drums etc and uses a Powerglide converter. There isn't an aftermarket case for the 904 or 727, so the standard case is what you're stuck with. I maxed out 904 is going to set you back around $5k in parts and is going to require a lot of maintenance. Most guys that run them always have a spare. Alan Jones

Re: Real 904 power limits [Re: dOrk !] #1378502 01/31/13 01:36 AM 01/31/13 01:36 AM
Joined: Jan 2003 Posts: 6,139 Melbourne , Australia LA360 master
LA360 master Joined: Jan 2003 Posts: 6,139 Melbourne , Australia	Quote: Quote: The Protrans 727 is a full 25 lbs lighter than a stock 727, and .25 quicker. Just curious ....what is the price of this setup ? A Proflite starts at around $6K Alan Jones

Re: Real 904 power limits [Re: LA360] #1378503 01/31/13 12:28 PM 01/31/13 12:28 PM
Joined: Dec 2005 Posts: 293 Kansas City Metro M mbogina enthusiast
mbogina enthusiast M Joined: Dec 2005 Posts: 293 Kansas City Metro	A ProTrans can utilize a 727 case or a 904 case, ours use a BB 727 case and 727 convertors. With all the bells and whistles, 727 case, Trans Brake, position 6 nuetral, choice of about 30 gearset combos, 300M main shaft, all billet drums w roller bearings, cast alum pan, etc, yes, you are looking at about 6k, maybe a bit more. I believe all the same stuff in a 904 case is somewhat cheaper without the custom shafts to convert 904 sizes to 727, and the added labor to convert a 727 case to accept 904 guts. My nomenclature may not be 100% correct, but i believe that the ProTrans is the 727 and 904 Mopar versions, and the ProFlite are the GM cases converted to accept the 904 guts w powerglide verts for use in Comp Elim Be a Rebel- Break the Laws of Physics!

Re: Real 904 power limits [Re: mbogina] #1378504 01/31/13 09:07 PM 01/31/13 09:07 PM
Joined: Jan 2003 Posts: 6,139 Melbourne , Australia LA360 master
LA360 master Joined: Jan 2003 Posts: 6,139 Melbourne , Australia	Quote: A ProTrans can utilize a 727 case or a 904 case, ours use a BB 727 case and 727 convertors. With all the bells and whistles, 727 case, Trans Brake, position 6 nuetral, choice of about 30 gearset combos, 300M main shaft, all billet drums w roller bearings, cast alum pan, etc, yes, you are looking at about 6k, maybe a bit more. I believe all the same stuff in a 904 case is somewhat cheaper without the custom shafts to convert 904 sizes to 727, and the added labor to convert a 727 case to accept 904 guts. My nomenclature may not be 100% correct, but i believe that the ProTrans is the 727 and 904 Mopar versions, and the ProFlite are the GM cases converted to accept the 904 guts w powerglide verts for use in Comp Elim The Proflite is an AMC 727 case with an adapter plate for the bellhousing that is about 3/4"-1" thick Alan Jones

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