Re: 904 Transmission for 79 360 motor
[Re: CudaDave7071]
#1199513
03/19/12 03:09 PM
03/19/12 03:09 PM
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Joined: Jan 2005
Posts: 3,344 Central TX
roe
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master
Joined: Jan 2005
Posts: 3,344
Central TX
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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
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Re: 904 Transmission for 79 360 motor
[Re: Paul_Fancsali]
#1199515
03/19/12 08:16 PM
03/19/12 08:16 PM
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Joined: Sep 2003
Posts: 159 Woodward, PA
75DART440
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Joined: Sep 2003
Posts: 159
Woodward, PA
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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!!!
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Re: 904 Transmission for 79 360 motor
[Re: 75DART440]
#1199516
03/19/12 09:20 PM
03/19/12 09:20 PM
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Joined: Jan 2003
Posts: 25,200 Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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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.
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Re: 904 Transmission for 79 360 motor
[Re: 70AARcuda]
#1199520
03/20/12 03:24 AM
03/20/12 03:24 AM
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Joined: Feb 2004
Posts: 4,501 Gainesville,FL
goldmember
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master
Joined: Feb 2004
Posts: 4,501
Gainesville,FL
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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.
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Re: 904 Transmission for 79 360 motor
[Re: 70AARcuda]
#1199521
03/20/12 09:08 AM
03/20/12 09:08 AM
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Joined: Jan 2003
Posts: 75,070 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,070
U.S.S.A.
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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 ...
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Re: 904 Transmission for 79 360 motor
[Re: CudaDave7071]
#1199525
03/20/12 07:49 PM
03/20/12 07:49 PM
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Joined: Jan 2003
Posts: 5,894 Florida
Locomotion
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Joined: Jan 2003
Posts: 5,894
Florida
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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.
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Re: 904 Transmission for 79 360 motor
[Re: Locomotion]
#1199526
03/20/12 08:11 PM
03/20/12 08:11 PM
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Joined: Jul 2003
Posts: 6,167 Maryland
GO_Fish
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Joined: Jul 2003
Posts: 6,167
Maryland
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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
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