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904 low gear set- what vehicles and what parts?
#1328085
10/29/12 11:48 AM
10/29/12 11:48 AM
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Joined: Apr 2009
Posts: 3,414
Toronto
mshred
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Toronto
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Hey guys, I would like to do the low gear swap on my 72 year 904 transmission. My transmission currently has aluminum 4 pinion planets front and rear. My first question- what vehicles have low gear set transmissions? My local wreckers is scarce for 80's year chryslers, so later model stuff like dakota trucks, 6cyl jeeps, late model rams, etc. is all I really have to pick from. What year vehicles would have the transmissions I am looking for? Second- when I get the transmission apart, what parts am I looking for from it? I have read that the planetaries are steel in these transmissions- can I swap both in to my current 72 year aluminum planet trans? Are there any other mods to get the low gear set to work? Thanks! 
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Re: 904 low gear set- what vehicles and what parts?
[Re: plumcuda]
#1328087
10/29/12 04:07 PM
10/29/12 04:07 PM
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Joined: Jan 2005
Posts: 3,344
Central TX
roe
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master
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Central TX
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The guy who built my Trans for me said they come in the jeeps, but didn't specify what years.
1971 Plymouth Satellite
408/904 8 3/4 3.23 SG
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Re: 904 low gear set- what vehicles and what parts?
[Re: mshred]
#1328089
10/29/12 05:20 PM
10/29/12 05:20 PM
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Joined: Jan 2003
Posts: 25,720
Rio Linda, CA
John_Kunkel
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Rio Linda, CA
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Any '82 or later trans from the 904 family will have the low gearset.
The INTERNET, the MISinformation superhighway
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Re: 904 low gear set- what vehicles and what parts?
[Re: mshred]
#1328090
10/29/12 06:33 PM
10/29/12 06:33 PM
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Joined: Jan 2003
Posts: 6,816
Alton, IL
Dakota_Don
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Alton, IL
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Quote:
Wondering if the A-500 trans will work for parts as there is one local to me for 100 bucks. Also wondering if the planetaries are steel and if both front and rear will swap into the 904?
yup
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Re: 904 low gear set- what vehicles and what parts?
[Re: Dakota_Don]
#1328091
10/29/12 08:14 PM
10/29/12 08:14 PM
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Joined: Apr 2009
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Toronto
mshred
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Quote:
Quote:
Wondering if the A-500 trans will work for parts as there is one local to me for 100 bucks. Also wondering if the planetaries are steel and if both front and rear will swap into the 904?
yup
Both planetaries are steel? What parts do I need to actually swap in from the A-500 into the older trans to complete the swap?
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Re: 904 low gear set- what vehicles and what parts?
[Re: John_Kunkel]
#1328096
11/02/12 03:38 PM
11/02/12 03:38 PM
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Toronto
mshred
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Quote:
Quote:
I have heard some people mention that some A-500's are not low gear set??? 
All A500's have the low gearset.
John, does the A-500 have a 5 clutch front drum that is swapable into earlier 904's? or are there issues with the pump when doing this?
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Re: 904 low gear set- what vehicles and what parts?
[Re: mshred]
#1328097
11/02/12 04:44 PM
11/02/12 04:44 PM
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Joined: Jan 2003
Posts: 9,826
las vegas
70AARcuda
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you can put 5 disc and steels in a 4 disc clutch pac...
just use the thin .068 disc..and .061 steels..i might have the thickness backwards...but they are the same thickness that the rear drum uses..
you should end up with .050 clearance...i usually have the pressure plate ground .010 to clean it up and get a few thousands extra clearance.
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)
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Re: 904 low gear set- what vehicles and what parts?
[Re: mshred]
#1328098
11/02/12 07:40 PM
11/02/12 07:40 PM
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Joined: Jan 2003
Posts: 25,720
Rio Linda, CA
John_Kunkel
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Rio Linda, CA
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the A500 will have a 5-clutch front drum.
To use the 5-clutch drum in an earlier 904 you need the matching front pump or need to modify the existing front pump.
The INTERNET, the MISinformation superhighway
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Re: 904 low gear set- what vehicles and what parts?
[Re: John_Kunkel]
#1328099
11/02/12 08:18 PM
11/02/12 08:18 PM
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Joined: Apr 2009
Posts: 3,414
Toronto
mshred
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Quote:
the A500 will have a 5-clutch front drum.
To use the 5-clutch drum in an earlier 904 you need the matching front pump or need to modify the existing front pump.
So If I take the front pump from the same A-500 trans, then it should work with no other modifications?
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Re: 904 low gear set- what vehicles and what parts?
[Re: mshred]
#1328100
11/03/12 04:50 PM
11/03/12 04:50 PM
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Joined: Jan 2003
Posts: 25,720
Rio Linda, CA
John_Kunkel
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Too Many Posts
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Rio Linda, CA
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It gets a little complicated, if the 904 is pre-'78 you can get in trouble mixing parts; if the 904 is '78 or later non-lockup you can use the later 5-clutch drum and pump but if the 904 is pre-'78 you'll also need the later input shaft and rear clutch piston retainer.
Or the earlier pump can be machined to accept the 5-clutch drum.
The INTERNET, the MISinformation superhighway
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Re: 904 low gear set- what vehicles and what parts?
[Re: John_Kunkel]
#1328101
11/03/12 05:37 PM
11/03/12 05:37 PM
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Joined: Apr 2009
Posts: 3,414
Toronto
mshred
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Quote:
It gets a little complicated, if the 904 is pre-'78 you can get in trouble mixing parts; if the 904 is '78 or later non-lockup you can use the later 5-clutch drum and pump but if the 904 is pre-'78 you'll also need the later input shaft and rear clutch piston retainer.
Or the earlier pump can be machined to accept the 5-clutch drum.
Are there any threads that explain what has to be machined? Or is it kinda obvious when looking at the parts what would have to happen?
Thanks for the info John
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Re: 904 low gear set- what vehicles and what parts?
[Re: mshred]
#1328102
11/03/12 08:18 PM
11/03/12 08:18 PM
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Anonymous
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Anonymous
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Personally, I wouldn't bother.
I did it a few years back and there really wasn't a difference in a street car.
If you looking for every last hundredth in class racer it may be worth it but otherwise you can save your money and time.
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Re: 904 low gear set- what vehicles and what parts?
#1328103
11/03/12 09:03 PM
11/03/12 09:03 PM
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Joined: Jan 2005
Posts: 3,344
Central TX
roe
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master
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Posts: 3,344
Central TX
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I don't know about that. I just had my 904 rebuilt with a transgo shift kit, low gearset, and a factory high stall converter, and left in my 2.76 rear gears. My car woke up like u wouldn't believe. Much quickening the line, breaks loose my org leg so much easier, even with heavy 22" rims and and a highway rear gear. It could be a combination of everything though.  roe
1971 Plymouth Satellite
408/904 8 3/4 3.23 SG
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Re: 904 low gear set- what vehicles and what parts?
#1328104
11/04/12 01:29 AM
11/04/12 01:29 AM
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Joined: Apr 2009
Posts: 3,414
Toronto
mshred
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OP
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Posts: 3,414
Toronto
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Quote:
Personally, I wouldn't bother.
I did it a few years back and there really wasn't a difference in a street car.
If you looking for every last hundredth in class racer it may be worth it but otherwise you can save your money and time.
running in a heads up class where im trying to ring every last bit out of the car
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