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360 to 904
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purple72Gremlin View Drop Down
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Points: 16611 		Post Options Post Options   Thanks (0) Thanks(0)   Quote purple72Gremlin Quote  Post ReplyReply Direct Link To This Post Posted: Aug/07/2018 at 1:02pm
Originally posted by farna farna wrote:

At the beginning of the HR article they seem to indicate that both the 904 and 727 use a pressed in sprag, but it's not the most detailed article -- I'm sure you guys know what you're talking about! Saw it mentioned in another article while I was looking for something else... 727 pump in 904 trans. Seems I have heard of that, but can't find anything on it. Did find some modified pump bodies. Maybe it's a 998/999 front pump in a 904? can't find anything on that either... so maybe the modified pump body is the way to go? http://www.aandatrans.com/Products/904-Modified-Front-Pump-Support-(1978-Up)__12781L.aspx

I'm learning here guys, not trying to make things difficult!
The 727 is much bigger than the 904. The pump is huge compared to the 904. The 998 is very similar, and it uses alot of the same parts as the 904. Chrysler even used the 904 on their 360s. AMC always used 727s on their 360s. This is after 20+ years of working in transmission shops.
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1970390amx View Drop Down
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Points: 3314 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 1970390amx Quote  Post ReplyReply Direct Link To This Post Posted: Aug/08/2018 at 1:28am
727 pump is totally different. The weak point of the converter is the slots the pump gear drives. The hub has a common problem with cracks from the corners of the slots. The 42rh- 42re and at least the 32rh have flats that drive the converter and do not have a problem with cracks. The pump body and gears is a direct swap, the gears are also thicker for more capacity. Some transmissions use drums with five clutches, some drums have as little as 3. I would also use the newer 2.72 low gear set if not already in the transmission.
1970 390 4speed Bittersweet shadow mask AMX
1970 Amx missing most everything, or in a box
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PROSTOCKTOM View Drop Down
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Points: 2450 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PROSTOCKTOM Quote  Post ReplyReply Direct Link To This Post Posted: Aug/08/2018 at 8:55am
The A500 which is a 904 with a bolt on overdrive section has the pump with flats on the torque converter rather than the 2 slits on the snout like is mentioned above. It requires no extra effort to use this style pump and any good transmission shop should already be aware of this upgrade. If you building a 904 for any kind of performance this would be the first place to start.

Tom
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PHAT69AMX View Drop Down
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Points: 5919 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PHAT69AMX Quote  Post ReplyReply Direct Link To This Post Posted: Aug/23/2018 at 2:51pm
There is a pretty good 904 Trans magazine article on this page,
the link to images of the article is about the 9th one down from the top
and titled: June 1998 Car Craft, "904 versus The World"


Link to a Short YouTube Burnout Video
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Greyhounds_AMX View Drop Down
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Points: 1268 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Greyhounds_AMX Quote  Post ReplyReply Direct Link To This Post Posted: Aug/24/2018 at 6:14pm
First question, is the transmission you are going to use a 904, or a 998? Both were offered by AMC.

Transmission folks refer to all of the derivatives of the small TF 904 as "904's", although there are big differences between the 904, 998, and 999 that make one stronger than the next. Here's my understanding of the breakdown:

The 904 was targeted at 6-cyl cars, and has aluminum planetary gears and 2 or 3 front clutches. 

The 998 was targeted at small V8 cars and has steel planetary gear, 4 front clutches, and two external reinforcing ribs on the rear servo housing.

The 999 was build for the Dodge 360 cars and added another front clutch and a wider front band. 

I don't think the 999 version was ever used in AMC cars, but it's easy to make one from a 998 by adding the 360 Dodge version parts. With decent quality rebuild parts and a good shift kit the 999 will hold up fine behind a mildly beefed up 360, 390, or 401. I ran one for 10k miles in my 390 AMX and it worked great, I only pulled it out to swap to a T5.
1968 AMX 390 w/T5
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farna View Drop Down
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Points: 19676 		Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Aug/25/2018 at 7:50am
998 was used behind 304s and sixes in Eagles. 999 was used behind the 4.0L in Wranglers. So you an get a case for an AMC V-8 from 72-79 2WD cars with 304, or convert Eagle 4x4 to 2WD with 904/998 parts. Same for the 999. I don't know of any 2WD 999 applications, maybe some Dodge trucks?  
Frank Swygert
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nickleone View Drop Down
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Points: 1441 		Post Options Post Options   Thanks (0) Thanks(0)   Quote nickleone Quote  Post ReplyReply Direct Link To This Post Posted: Aug/25/2018 at 1:17pm
I had a 998 with a shift improver kit behind a 401 in my 73 Gremlin Pro rally car. 401 had a mild cam and torker 4 bbl manifold

Nick
nick
401 71 Gremlin pro rally car sold
390 V8 SX/4 pro rally car sold
1962 Classic SW T5 4 wheel disc brakes
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