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Re: 904 trans died behind 390 stroker, time for 727????
[Re: tpabayflyer]
#139048
10/20/08 03:24 PM
10/20/08 03:24 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Dissect it & find out what happened. I knew of a 66 A body that was in the 10's(strip only) with a not too special 904. Stay with it, a 904 can handle it.
live every 24 hour block of time like it's your last day on earth
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Re: 904 trans died behind 390 stroker, time for 727????
[Re: stumpy]
#139049
10/20/08 03:37 PM
10/20/08 03:37 PM
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Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
dusturbd340W5
master
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master
Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
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a broken input or output shaft would cause no movement so would a stripped converter or broken pump gears so no way to know with out tearing it down.As someone thats been in the buisness over 20 years I would forget about the whole lockup deal.
70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake
best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4
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Re: 904 trans died behind 390 stroker, time for 727????
[Re: RapidRobert]
#139050
10/20/08 03:38 PM
10/20/08 03:38 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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727 non lock up takes more hp to turn it,but holds up better than a 904 tranny I am in the same boat with ya right now,my 904 is going south real fast,been babying it latly since it started slipping,I tightend the kick down band and it stoped slipping but the adjuster is in all the way in with just enuff threds to hold the lock nut on I am going with a 76 loadflight 727 with a short shaft bolt on yoke from a truck,and will build a drive shaft with a slip yoke well thats after a rebuild cause the sprag is gone in it,took about 8 N drops to kill it after 7-8 yrs of hard driving it best 50$ tranny I ever got from the clearwater u-pull it  gonna try and save the 904 as a spare maybe if it dont die before I gets the 727 done good luck with it 
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Re: 904 trans died behind 390 stroker, time for 727????
[Re: tpabayflyer]
#139052
10/20/08 05:04 PM
10/20/08 05:04 PM
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Joined: Jul 2005
Posts: 327
pittsburgh,Pa.
mikepar
enthusiast
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enthusiast
Joined: Jul 2005
Posts: 327
pittsburgh,Pa.
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Dawg To check the front pump action note the fluid level on the dip stick WITH the engine off. Start it up and check the level again running, the level will be lower on the stick which means the pump is werkin
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Re: 904 trans died behind 390 stroker, time for 727????
[Re: 1BAD68]
#139054
10/20/08 07:35 PM
10/20/08 07:35 PM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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stick with the 904.
A bad front pump can still pump enough to raise and lower the tranny fluid level, that is not a good way to test it. If you think you want to test it first it is real simple to hook up a preasure gauge to the line preasure port and see if you have line preasure. I wouldn't bother though, it has to come out any how.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 904 trans died behind 390 stroker, time for 727????
[Re: tpabayflyer]
#139059
10/21/08 09:10 AM
10/21/08 09:10 AM
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Joined: Jan 2003
Posts: 74,979
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,979
U.S.S.A.
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Quote:
If the front pump failed would it be a relatively easy fix to get at the pump from the front of the trans or does everthing need to come out??? TBF
if the pump failed it usually breaks the tangs off the rotor and/or breaks the snout of the convertor , metal particles go everywhere ...
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Re: 904 trans died behind 390 stroker, time for 727????
[Re: tpabayflyer]
#139061
10/21/08 10:02 AM
10/21/08 10:02 AM
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Joined: Jan 2003
Posts: 74,979
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,979
U.S.S.A.
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Quote:
Great.... well I'll find out later when I drop the trans..... Now back to the original question, Does anybody know what would cause the loss of all forward gears as well as reverse??? Is the front pump a likely guess? TBF
I think what caused it was a 904 behind that motor. for you to have lost all forward motion either you have no fluid flow of a shaft broke .
Pull a line off the trans cooler , direct it int oa bucket and start it up with the car in neutral , if you get no flow then its the pump , if you get fluid you broke a shaft .
Either way I would be putting a 727 behind that , 904's to handle torquey motors need $$$ parts .
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Re: 904 trans died behind 390 stroker, time for 727????
[Re: JohnRR]
#139062
10/21/08 11:10 AM
10/21/08 11:10 AM
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Joined: Feb 2005
Posts: 4,884
Michigan
MNobody
master
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master
Joined: Feb 2005
Posts: 4,884
Michigan
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Quote:
Quote:
Great.... well I'll find out later when I drop the trans..... Now back to the original question, Does anybody know what would cause the loss of all forward gears as well as reverse??? Is the front pump a likely guess? TBF
I think what caused it was a 904 behind that motor. for you to have lost all forward motion either you have no fluid flow of a shaft broke .
Pull a line off the trans cooler , direct it int oa bucket and start it up with the car in neutral , if you get no flow then its the pump , if you get fluid you broke a shaft .
Either way I would be putting a 727 behind that , 904's to handle torquey motors need $$$ parts .
That sound's like good advice to me from what i have read from several other post's.
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Re: 904 trans died behind 390 stroker, time for 727????
[Re: tpabayflyer]
#139064
10/21/08 05:58 PM
10/21/08 05:58 PM
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Joined: Jan 2003
Posts: 5,894
Florida
Locomotion
master
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master
Joined: Jan 2003
Posts: 5,894
Florida
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Whether or not the lock-up converter had anything to do with the failure, it was never intended to be used in performance applications. Valve bodies are different too and the parts don't interchange, but I don't know what the differences are. With the right parts, a lock-up trans can be converterted to a non-lock-up and, of course, the low gear sets do interchange. A regular 904 trans, built properly, will work fine. But a regular 727 is stronger and will likely last longer simply because of the bigger, stronger parts used. The key words are "regular" and "non lock-up". I have a few years on the 904 in my car built by JW but may swap it out for freshening this off-season to be safe. Nothing special or trick, just their reverse manual valve body, a low gear set and whatever HD bands and clutches they use. I also use Amsoil Supershift synthetic fluid.
I have heard that OEM bands may not hold up to hard shifts because of the material. Same reasoning if using a 5.0 lever. There are a couple different performance bands too. Between "blue" and "red", I believe the red are best. I just never got into transmissions and let JW take care of that.
I don't think a freewheeling low gear is a good idea on the street either.
Last edited by Locomotion; 10/21/08 06:18 PM.
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