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  #1  
Old 08-11-2002, 09:27 PM
71dart666 71dart666 is offline
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Default 904 tranny how much power can one take?

How much power can a 904 tranny be built, reasonably to take with reliablity. For example would a stroker 360 be too much for a well built 904 ?
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Old 08-11-2002, 10:09 PM
g70challenger g70challenger is offline
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I saw a posting that stated that a 904 can take up to 350 horsepower. I don't know if this is in stock form or not. I am also interested in improving the shift quality and durability of my 904 as well. Any help from my fellow Moparites would be appreciated.
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  #3  
Old 08-11-2002, 11:04 PM
Bill55AZ Bill55AZ is offline
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They used a version of the 904 in cop cars, I think it was the 998 or 999. Ask your tranny guys, I think a 904 can be made into the stouter version during a re-build.
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Old 08-11-2002, 11:38 PM
Doug Wilson Doug Wilson is offline
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I put a Tci 904 behind a 450 Horsepower 340. No problems, yet.

I think its' longevity, as in any other trans, depends on how hard you use it, and how tight you hook up when you launch.
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  #5  
Old 08-12-2002, 10:23 AM
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dirty dan dirty dan is offline
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Question why bother

Why bother with the 904?
when there is the 727 that will take a hard lickin and keep on tickin.
In stock configuration a 727 will take 650or 700 foot pounds
of torqe and come back for more.
I don`t know the requirements of your project.
But its probably going to be a lot cheaper to change to a 727
then to biuld a 904.
Just ment to be fuel for thought.
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  #6  
Old 08-12-2002, 02:03 PM
70AARCuda 70AARCuda is offline
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my 69 barracuda with a 370 w/2 powered small block ran a 904 with a tranzact brake. Got about 5 years on the trans before rod broke in engine. Just adjusted the bands and changed fluid this year, now using a standard head 340 that runs 11.50 but still using brake.

the old w2 engine ran a best of 10.62 @124 in las vegas nv. Also for one year i ran on a Pro light with the car. Was only mopar in Super Pro and won one race and should have been in the finals on another but broke out against a dragster...

So I think 904s are just fine...

tony
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  #7  
Old 08-12-2002, 03:25 PM
Doug Wilson Doug Wilson is offline
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I think I paid $900 for the Tci through Jeg's. I didn't want the extra weight of the 727, and didn't want to modify the floor pan of the '66 Barracuda.
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Old 08-12-2002, 10:51 PM
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rmrod rmrod is offline
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If you have the 904 built up by a reputable transmission shop that races what they build you will be A - okay. I've got a built 904 with a 5 clutch pack, a MP shift kit, 2:74 first gear, 2800 stall convertor, B&M balance plate buckled to a blueprinted 340. It's worth a couple of tenth's on the 1/4 mile over the 727. It shifts strong. Check with the professionals. They can build you a 904 or a 727 for about the same money. It depends on the horsepower you intend to put on the ground.
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  #9  
Old 08-12-2002, 11:34 PM
Doug Wilson Doug Wilson is offline
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Yup!
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  #10  
Old 08-13-2002, 01:56 AM
5thAve 5thAve is offline
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I've never had one last too long behind a stock 360, don't even want to think about how long it'll last behind a stroker.
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  #11  
Old 08-13-2002, 04:19 AM
volare360 volare360 is offline
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lets see here
the 904 is lighter physically
its lighter internally-less mass to turn
and if the car came with a 904 it bolts in
with a 727 at the very least driveshaft

built right and set up right they will last
tranny cooler,good fluid,ect

dirty dan
what if you only have a 400HP engine-why go for overkill
and even a 727 should be rbt-you never know what it was used for or how it was treated
I know a guy that HAD to have a turbo400 in his malibu(nicely built 350)
the one he got he just slapped it in
he got a month B4 it burnt up
the T350 he was looking at was rebuilt,and he would have had no changing
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Old 08-13-2002, 10:04 AM
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dirty dan dirty dan is offline
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Default Why the over kill?

Well volare 360 Your right.
The 904 is both smaller and lighter than the 727.
Required parts for this swap is as follows.
(1) 727 with torqe convertor
(2)727 flex plate
(3)727 drive shaft yoke
If you use your old drive shaft with the 727 yoke it
will need to be shortened 2 1/2".
Aside from that it is a bolt in swap.
The only possable exception may or may not be some of
the A-bodies Floor pan related.
(What if you only have 400 hp?)
If it were me and the 400hp I would look ahead a little Bit.
You see I would want more hp as I could aquire it,little
by little.
So I wouldn`t want to have to go back and upgrade later.
You see later to me means it will be harder to find a 727.
As well as the cost of changeing it again.
You may be satisfied with 400hp that may be all you will
ever need,want or require.
That is your option.
You also mentioned 400 turbo thats a chebby peice that was what caused its demize.
I think if you install either a 727 or a 904 used then you are doing exactly that,a used unknown 727 or anything else .
When it came down to handing out the $$$ I would want the better peice .
Just my opinion perhaps different from yours.
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  #13  
Old 08-13-2002, 02:16 PM
Doug Wilson Doug Wilson is offline
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The 727 is the better piece, and from Tci, the cost is pretty close for either. Whatever trans you pick, you REALLY should have it rebuilt before you plug it in. If I had had anything but an A Body, I would have used a 727. I just didn't want to hammer the floor.

The only thing a 904 has going for it is lighter weight - I know some race cars us them for that reason only, but they usually have a spare or two along - just in case.
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