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904 Transmission for 79 360 motor #1199511 03/19/12 02:47 PM 03/19/12 02:47 PM
Joined: May 2003 Posts: 234 Postville, IA C CudaDave7071 OP enthusiast
CudaDave7071 OP enthusiast C Joined: May 2003 Posts: 234 Postville, IA	I've got a 79 360 engine with a 904 transmission. The 904 trans was from an A-Body 318. Question: are there differences between torque converters for a 904 for the 318 and 360 motors? I've got some motor vibration issues (longer story) but this answer might help me out. Thanks!

Re: 904 Transmission for 79 360 motor [Re: CudaDave7071] #1199512 03/19/12 03:03 PM 03/19/12 03:03 PM
Joined: Nov 2005 Posts: 589 Fortworth TX M mod5v mopar
mod5v mopar M Joined: Nov 2005 Posts: 589 Fortworth TX	Yes 360 has balance weights on it. easy fix would be a B&M flexplate for the 360.

Re: 904 Transmission for 79 360 motor [Re: CudaDave7071] #1199513 03/19/12 03:09 PM 03/19/12 03:09 PM
Joined: Jan 2005 Posts: 3,344 Central TX roe master
roe master Joined: Jan 2005 Posts: 3,344 Central TX	Yes there is a difference. I had to do this when I put my LA 360 in my satellite with a 904. In order to run your 904 with the 318's nuetral balance converter behind your 360 you need to pick up a weighted flexplate from B&M or an equivalent. The one I picked up had 727 & 904 pattern on it so don't be scared away from one that's has both if you come across it. The second option is to use your nuetral balanced flexplate and a weighted converter with the 904. I chose the aftermarket flexplate and i'm glad I did. It's much stronger than a stock flexplate and I never had to remove the trans or torque converter from the car during the swap, and I didn't lose a drop of fluid either. 1971 Plymouth Satellite 408/904 8 3/4 3.23 SG

Re: 904 Transmission for 79 360 motor [Re: roe] #1199514 03/19/12 04:33 PM 03/19/12 04:33 PM
Joined: Jan 2003 Posts: 2,931 P Paul_Fancsali master
Paul_Fancsali master P Joined: Jan 2003 Posts: 2,931	Only problem is a stock 904 does not live long behind a built 360 even a modest built one.

Re: 904 Transmission for 79 360 motor [Re: Paul_Fancsali] #1199515 03/19/12 08:16 PM 03/19/12 08:16 PM
Joined: Sep 2003 Posts: 159 Woodward, PA 7 75DART440 member
75DART440 member 7 Joined: Sep 2003 Posts: 159 Woodward, PA	Yet another option: Grab a used 904/360 converter, even if it's NFG. Flexplate will only bolt on one way. Using the flexplate laid in place on the donor converter, mark location of weights. Measure carefully. Knock weights off of donor converter. Place your converter face down on a bucket, line up your marked flexplate, and using your measurements you now know where the weights need to be. Weld 'em on! Kinda meatball surgery, but I had a friend with a 360/904 70 Dart that was done this way, and it went 75,000 miles without a problem. Too many donuts, burn outs, and brake torquing finally killed the 904. We did a second converter for a junkyard trans so he could sell the car. Next owner ran it a year and totalled it. Buy a Hybrid!! I need your gas!!! Currently spending $1,000 a month to feed the Hemis!! Looking for that elusive CHEAP 71-72 Plymouth B-body 2 door OR 71-72 Coronet 4 door!!!

Re: 904 Transmission for 79 360 motor [Re: 75DART440] #1199516 03/19/12 09:20 PM 03/19/12 09:20 PM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	Quote: Yet another option: Grab a used 904/360 converter, even if it's NFG. Flexplate will only bolt on one way. Using the flexplate laid in place on the donor converter, mark location of weights. Measure carefully. Knock weights off of donor converter. Place your converter face down on a bucket, line up your marked flexplate, and using your measurements you now know where the weights need to be. Weld 'em on! Kinda meatball surgery, but I had a friend with a 360/904 70 Dart that was done this way, and it went 75,000 miles without a problem. Too many donuts, burn outs, and brake torquing finally killed the 904. We did a second converter for a junkyard trans so he could sell the car. Next owner ran it a year and totalled it. Don't that weld up thing to many converters. Not a major surgery thing and is a money saving thing. Ran 11's at the strip for years with a converter I did this way.

Re: 904 Transmission for 79 360 motor [Re: Paul_Fancsali] #1199517 03/20/12 12:43 AM 03/20/12 12:43 AM
Joined: Jan 2005 Posts: 3,699 Newport, Mi Evil Spirit master
Evil Spirit master Joined: Jan 2005 Posts: 3,699 Newport, Mi	Quote: Only problem is a stock 904 does not live long behind a built 360 even a modest built one. A 904 With stock internals will last a long time with a proper valve body installed as long as it was healthy to start with. I've built 904's out of my leftover "junk" - 6 cyl 3 disc forward and direct drums, aluminum planetary sets, etc. and had them last behind 350-400hp engines as long as a good shift kit was used, which you would probably also do to a 727. The same things that kill a 904 will kill a 727 - improper kickdown linkage or adjustment being the worst culprit. And for every cracked 904 converter hub that I've changed I've probably changed 2 broken 727 rear bands. Free advice and worth every penny... Factory trained Slinky rewinder.........

Re: 904 Transmission for 79 360 motor [Re: Paul_Fancsali] #1199518 03/20/12 01:11 AM 03/20/12 01:11 AM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	Quote: Only problem is a stock 904 does not live long behind a built 360 even a modest built one. if you are having problems with a 904 lasting behind a modest build 360...you need to find someone else to build your trans.... 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 for 79 360 motor [Re: 70AARcuda] #1199519 03/20/12 02:57 AM 03/20/12 02:57 AM
Joined: Jan 2003 Posts: 4,142 Canada -- Posts: 4034 -Registe... 5 5thAve Doesn't care what this says anyway
5thAve Doesn't care what this says anyway 5 Joined: Jan 2003 Posts: 4,142 Canada -- Posts: 4034 -Registe...	I've had my share of 904s die behind 360s. I quit gambling and went 727.

Re: 904 Transmission for 79 360 motor [Re: 70AARcuda] #1199520 03/20/12 03:24 AM 03/20/12 03:24 AM
Joined: Feb 2004 Posts: 4,501 Gainesville,FL G goldmember master
goldmember master G Joined: Feb 2004 Posts: 4,501 Gainesville,FL	Quote: Quote: Only problem is a stock 904 does not live long behind a built 360 even a modest built one. if you are having problems with a 904 lasting behind a modest build 360...you need to find someone else to build your trans.... Right on! I get a out of the put a 727 in it suggestions for most street and street strip guys.

Re: 904 Transmission for 79 360 motor [Re: 70AARcuda] #1199521 03/20/12 09:08 AM 03/20/12 09:08 AM
Joined: Jan 2003 Posts: 74,978 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,978 U.S.S.A.	Quote: Quote: Only problem is a stock 904 does not live long behind a built 360 even a modest built one. if you are having problems with a 904 lasting behind a modest build 360...you need to find someone else to build your trans.... You are ASSuMEing some of these people are having their 904's gone thru ...

Re: 904 Transmission for 79 360 motor [Re: goldmember] #1199522 03/20/12 12:00 PM 03/20/12 12:00 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: if you are having problems with a 904 lasting behind a modest build 360...you need to find someone else to build your trans. We've beat em to death w stock rebuild parts & still no probs. less reciprocating/rotating weight less overall weight live every 24 hour block of time like it's your last day on earth

Re: 904 Transmission for 79 360 motor [Re: RapidRobert] #1199523 03/20/12 04:48 PM 03/20/12 04:48 PM
Joined: Jan 2003 Posts: 2,931 P Paul_Fancsali master
Paul_Fancsali master P Joined: Jan 2003 Posts: 2,931	A good set of tires and fairly heathy engine and can you say KABOOM! two different 904s by two different trans shops none cheap and thats what. I will stick with my current 727 combo that has 900 passes and cost the same amount to build with aftermarket parts

Re: 904 Transmission for 79 360 motor [Re: Paul_Fancsali] #1199524 03/20/12 07:13 PM 03/20/12 07:13 PM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	Quote: A good set of tires and fairly heathy engine and can you say KABOOM! two different 904s by two different trans shops none cheap and thats what. I will stick with my current 727 combo that has 900 passes and cost the same amount to build with aftermarket parts well..hear ya go again...LOL I got 3 904s with transbrakes installed..one is going 7 seasons on it..another has 5 ..and the newest one has 1 season..and they are very high tech trans..I rebuilt them..LOL...probably got 300 bucks worth of parts in them outside the transbrake. one car has got 10.69 (7 seasons)...the slowest is 11.18 (1 season) .out west in Vegas,,,tire size range from 14 x 32 to 10 x 29 slicks. need to find someone who knows what they are doing.. 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 for 79 360 motor [Re: CudaDave7071] #1199525 03/20/12 07:49 PM 03/20/12 07:49 PM
Joined: Jan 2003 Posts: 5,894 Florida Locomotion master
Locomotion master Joined: Jan 2003 Posts: 5,894 Florida	I burned up 3 stock 727's behing a basically stock 340 when I first started driving. A shift kit made a world of difference and a good valve body was be better. I've run a 904 behind my 360 Dart Sport. JW Transmissions builds them with nothing I'd consider trick - * Manual reverse valve body * 4.2 kickdown lever * I believe the "red" clutches, not sure about bands. * Amsoil Supershift trans fluid * Trans cooler and deep pan * Converter flashes over 5,000 I'm pretty sure the rest are OEM parts except with some oiling/bearing tweaks. I weigh 3,540 lbs +, have run 11.22 @ 116 with 1.47 60' times. On several occasions after several years of running, my trans builder said to keep doing whatever I'm doing as far as running it, adjustments, fluids, servicing, etc. The only time I remember that a 904 went "BOOM" on me was when a rear u-joint let go at the 1/8 mile mark. The result ended up with a bent converter and chunks taken out of the block. But it wasn't the transmission's fault. I got a steel billet rear end yoke and solid Spicer 7260 joints that are still in after many years. Get the proper B&M flexplate which will solve the converter balance problem and it's a heck of a lot more durable than the OEM plate.

Re: 904 Transmission for 79 360 motor [Re: Locomotion] #1199526 03/20/12 08:11 PM 03/20/12 08:11 PM
Joined: Jul 2003 Posts: 6,167 Maryland GO_Fish master
GO_Fish master Joined: Jul 2003 Posts: 6,167 Maryland	My 904 with a B&M flex plate, 9.5" Dynamics converter and Cheetah full auto valve body (remainder stock internals) is just fine behind my mild 360. 13.59 at 98.72mph, trans is happy. Last edited by GO_Fish; 03/20/12 08:13 PM. Scott B. "I'm a self-made man... I started with nothing, and I still have most of it!" 68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph 69 340 GTS stock 14.18@ 95.60 mph 01 5.9L Ram 1500 Quad Cab 4x4 01 3.5L 300M 16.23@ 86.97 mph

Re: 904 Transmission for 79 360 motor [Re: CudaDave7071] #1199527 03/20/12 10:26 PM 03/20/12 10:26 PM
Joined: Jun 2006 Posts: 655 Alberta R rustbuckett68 mopar
rustbuckett68 mopar R Joined: Jun 2006 Posts: 655 Alberta	I ran a rebuilt 76 998 behind my stock (with a TQ carb and intake)76 360 in my 74 Cuda with no problems. Second gear rubber every time, my GM tranny tech buddy could not compehend how hard it shifted. Car ran an 14.97 with a 2 BBL cam. Had to answer a lot of questions. Then the car ran away from home!

Re: 904 Transmission for 79 360 motor [Re: rustbuckett68] #1199528 03/20/12 10:33 PM 03/20/12 10:33 PM
Joined: Jan 2003 Posts: 20,172 Park Forest, IL slantzilla Too Many Posts
slantzilla Too Many Posts Joined: Jan 2003 Posts: 20,172 Park Forest, IL	Funny thing is that in the 'Race' section they will tell you a 727 is junk and you need a Powerglide. One thing a good 904 will never do that a 727 will is explode the front drum. "Everybody funny, now you funny too."

Re: 904 Transmission for 79 360 motor [Re: slantzilla] #1199529 03/20/12 11:03 PM 03/20/12 11:03 PM
Joined: Jan 2005 Posts: 3,699 Newport, Mi Evil Spirit master
Evil Spirit master Joined: Jan 2005 Posts: 3,699 Newport, Mi	Quote: Funny thing is that in the 'Race' section they will tell you a 727 is junk and you need a Powerglide. One thing a good 904 will never do that a 727 will is explode the front drum. I stand beside my 904's, because I'll never sit on top of a 727... Free advice and worth every penny... Factory trained Slinky rewinder.........

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