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904 Transmission gurus..... #270862 03/29/09 08:24 PM 03/29/09 08:24 PM
Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada W Wedgeman OP pro stock
Wedgeman OP pro stock W Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada	What is the upgarde for a strong 904 that is behind a 360 ? What is it exactly I have to do/change for better strenght of the ttransmission ? Any infos please.. Daniel

Re: 904 Transmission gurus..... [Re: Wedgeman] #270863 03/29/09 08:45 PM 03/29/09 08:45 PM
Joined: Jul 2008 Posts: 30,424 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,424 Florida STAYcation	How HP is the 360 ? .. how heavy is the car ?

Re: 904 Transmission gurus..... [Re: dOc !] #270864 03/29/09 10:34 PM 03/29/09 10:34 PM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	i put 5 clutches in the front clutch pac using the thin clutches and steels.. for racing...i change out the big spring in the front clutch to the 24 small spring set up... outside that and the valve body the trans is stock. Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

Re: 904 Transmission gurus..... [Re: 70AARcuda] #270865 03/29/09 11:07 PM 03/29/09 11:07 PM
Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada W Wedgeman OP pro stock
Wedgeman OP pro stock W Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada	For 5 disc, I have to change the clutch housing, more room for 5 disc can I take it from a A-500 ? Or on what type of vehicule can I expect to find this set up ? Daniel

Re: 904 Transmission gurus..... [Re: Wedgeman] #270866 03/29/09 11:27 PM 03/29/09 11:27 PM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	this is what i have done to several 904s removed the 4 clutch/steels... installed the 5 clutch/steels..using the thin ones..i get about 50-55 thousands clearance which i think is too tight... I take the pressure plate that is in the clutch pac to machine shop..have about .020 removed to get .070-.075 clearance.. so i am using stock clutch/drum..and stock pump. Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

Re: 904 Transmission gurus..... [Re: 70AARcuda] #270867 03/30/09 01:09 AM 03/30/09 01:09 AM
Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada W Wedgeman OP pro stock
Wedgeman OP pro stock W Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada	Neat !!!! These are my first pointers on transmissions... Thanks Daniel

Re: 904 Transmission gurus..... [Re: Wedgeman] #270868 03/30/09 01:51 AM 03/30/09 01:51 AM
Joined: Jul 2005 Posts: 384 Australia M Mcode69 enthusiast
Mcode69 enthusiast M Joined: Jul 2005 Posts: 384 Australia	A good starting point is a '76 or later trans, they have most of the good mods done over the years by the factory. One of the weak points in the earlier trans's is they have aluminium planetary gear carriers which have been known to either chew the splines out or split in half. The '76 and later ones all had steel planetary carriers.

Re: 904 Transmission gurus..... [Re: Mcode69] #270869 03/30/09 10:19 AM 03/30/09 10:19 AM
Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada W Wedgeman OP pro stock
Wedgeman OP pro stock W Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada	OK ! thanks, another good info Daniel

Re: 904 Transmission gurus..... [Re: Wedgeman] #270870 03/30/09 10:32 AM 03/30/09 10:32 AM
Joined: Jan 2003 Posts: 9,982 Ansonia, CT C CJK440 master
CJK440 master C Joined: Jan 2003 Posts: 9,982 Ansonia, CT	Quote: For 5 disc, I have to change the clutch housing, more room for 5 disc can I take it from a A-500 ? Like was said you can fit 5 thin plates in a 4 clutch drum. Be carefull machining parts for clearance though. Take too much off and the steels won't engage the lugs in the drum. You can upgrade to stock 5 clutch parts so you can use 5 thick plates but you need to swap both clutch drums and the front pump housing. 2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"

Re: 904 Transmission gurus..... [Re: CJK440] #270871 03/30/09 11:02 AM 03/30/09 11:02 AM
Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada W Wedgeman OP pro stock
Wedgeman OP pro stock W Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada	AARCUDA... As stated, wouldn't it be better to dump my 67 and start with a later one ? '80-up ? Daniel Last edited by Wedgeman; 03/30/09 11:37 AM.

Re: 904 Transmission gurus..... [Re: Wedgeman] #270872 03/30/09 12:47 PM 03/30/09 12:47 PM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	Quote: AARCUDA... As stated, wouldn't it be better to dump my 67 and start with a later one ? '80-up ? Daniel if you are talking about the whole trans ..probably yes. but I would not mix parts unless you are positive they work. actually the 72 and newer 904 are better due to a change in the servos... some of the 904 came with 5 clutches aka 999 in the 80s. mine are used for bracket racing and so far it has worked for me. Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

Re: 904 Transmission gurus..... [Re: 70AARcuda] #270873 03/30/09 02:04 PM 03/30/09 02:04 PM
Joined: Jan 2003 Posts: 1,488 New Mexico 7 74Scamp pro stock
74Scamp pro stock 7 Joined: Jan 2003 Posts: 1,488 New Mexico	Quote: Quote: AARCUDA... As stated, wouldn't it be better to dump my 67 and start with a later one ? '80-up ? Daniel if you are talking about the whole trans ..probably yes. but I would not mix parts unless you are positive they work. actually the 72 and newer 904 are better due to a change in the servos... some of the 904 came with 5 clutches aka 999 in the 80s. mine are used for bracket racing and so far it has worked for me. Don't mean to hijack this thread, but for a mild 360, would you still machine to get the .70 to .75? Mine is a 999 and I'm getting ready to start putting it back together this weekend and was just wondering (my first tranny rebuild). Dave

Re: 904 Transmission gurus..... [Re: 74Scamp] #270874 03/30/09 02:06 PM 03/30/09 02:06 PM
Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada W Wedgeman OP pro stock
Wedgeman OP pro stock W Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada	No problems.....btw...how do you tell a 904 from a 999 ? Daniel

Re: 904 Transmission gurus..... [Re: Wedgeman] #270875 03/30/09 02:09 PM 03/30/09 02:09 PM
Joined: Jan 2003 Posts: 1,488 New Mexico 7 74Scamp pro stock
74Scamp pro stock 7 Joined: Jan 2003 Posts: 1,488 New Mexico	Not sure from the outside, but inside has the 5-disc clutch pak from the factory. Mine came out of a 78 Diplomat Police car.

Re: 904 Transmission...suite [Re: 74Scamp] #270876 03/30/09 02:13 PM 03/30/09 02:13 PM
Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada W Wedgeman OP pro stock
Wedgeman OP pro stock W Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada	OK....because it was a police car set up.......? Daniel Last edited by Wedgeman; 03/31/09 03:28 PM.

Re: 904 Transmission gurus..... [Re: Wedgeman] #270877 03/30/09 02:27 PM 03/30/09 02:27 PM
Joined: Jan 2003 Posts: 1,488 New Mexico 7 74Scamp pro stock
74Scamp pro stock 7 Joined: Jan 2003 Posts: 1,488 New Mexico	Yes. I think that's correct. I was, at one time (a couple years ago) told that was what I wanted to look for - a police car. Dave

Re: 904 Transmission gurus..... [Re: 74Scamp] #270878 03/30/09 03:01 PM 03/30/09 03:01 PM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	Quote: Quote: Quote: AARCUDA... As stated, wouldn't it be better to dump my 67 and start with a later one ? '80-up ? Daniel if you are talking about the whole trans ..probably yes. but I would not mix parts unless you are positive they work. actually the 72 and newer 904 are better due to a change in the servos... some of the 904 came with 5 clutches aka 999 in the 80s. mine are used for bracket racing and so far it has worked for me. Don't mean to hijack this thread, but for a mild 360, would you still machine to get the .70 to .75? Mine is a 999 and I'm getting ready to start putting it back together this weekend and was just wondering (my first tranny rebuild). Dave what i have read...again no experts... .015 per clutch....075 for 5 .060 for 4... Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

Re: 904 Transmission gurus..... [Re: 70AARcuda] #270879 03/30/09 04:03 PM 03/30/09 04:03 PM
Joined: Jan 2005 Posts: 12,419 Kalispell Mt. HotRodDave I Live Here
HotRodDave I Live Here Joined: Jan 2005 Posts: 12,419 Kalispell Mt.	Another good thing about the early 80s trans is the low gear ratio 1st and 2nd gear sets they have. When I build a 4 clutch drum into a 5 clutch unit I just change the snap ring thickness. Usually combining 2 thin flat snaprings and useing the thick waffle clutches you can get 5 in there. I don't like the flat ones because the fuid takes longer to get out from between them, the clutches will hydro plane over each other for a second. If my pack is still tight I might slide one flat clutch in there just to get the clearance. Another good mod is to remove the wavy snap rings and install flat rings, this reduces slipage during engagement. If you use the trans go kit don't be afraid to drill the shift holes to the max size, it still is not a hard shift. One more thing I like to do is run type F fluid for an even faster shift. I am not causing global warming, I am just trying to hold off a impending Ice Age!

Re: 904 Transmission gurus.....(suite..) [Re: HotRodDave] #270880 03/30/09 04:18 PM 03/30/09 04:18 PM
Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada W Wedgeman OP pro stock
Wedgeman OP pro stock W Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada	Wow.....that's a lot to assimilate......I'll work on all these infos.. Ok...took the trans apart looks great.....Is this the picture of worn clutches ? looks fine to me....has it been rebuilt ? or just a polite previous owner ? Comments please.... Also.....yes the planetray carrier is aluminum... Last edited by Wedgeman; 03/31/09 03:04 PM.

Re: 904 Transmission ..(suite..) [Re: Wedgeman] #270881 03/31/09 03:05 PM 03/31/09 03:05 PM
Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada W Wedgeman OP pro stock
Wedgeman OP pro stock W Joined: May 2004 Posts: 1,522 Ste-Sophie, Quebec, Canada	Do you think I still need to rebuild it ? it's going behind a 360 Or I could get an '87 model that was in a Fifth Ave car with a 318 ? Daniel Last edited by Wedgeman; 03/31/09 03:49 PM.

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