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Re: 904 trans died behind 390 stroker, time for 727????
[Re: tpabayflyer]
#139108
10/29/08 10:36 PM
10/29/08 10:36 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Quote:
Well.. if I replace it will I be back here next month with the same problem ???? I have maybe 500 miles on the engine and trans and I don't want to go through this exercise again...... Is there a heavy duty input shaft that I can get????? Is there anything I can do to minimize the chances of a repeat???? FWIW, when the trans failed I was at the dragstrip with my drag radials on for the first time and it let go at the 1-2 shift........ At this point, I would rather spend the time and money and go 727. I don't want to just replace the input shaft and hope for the best as I think a new one will just end up snapping again. I do like having the 2.74 low gearset and I spent alot of money on a fresh rebuild with good parts but if I can't be somewhat assured that I won't break a new shaft I don't think it is smart money to "hope" I won't have another failure.... I want to have fun with this car and take it to the strip often. TBF
whats the build specs on the motor. unless youre running SERIOUS HP, you shouldnt worry about breaking shafts like that. most likely had a defect
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Re: 904 trans died behind 390 stroker, time for 727????
[Re: tpabayflyer]
#139111
10/29/08 11:53 PM
10/29/08 11:53 PM
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Joined: Jan 2003
Posts: 1,586
Tampa, FL
tpabayflyer
OP
pro stock
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OP
pro stock
Joined: Jan 2003
Posts: 1,586
Tampa, FL
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Another question is the sprag.... The overrunning clutch issue with the 727's is a big deal whenever you have a driveline issue such as a rear end failure. I wonder if I should check it out??? When this thing snapped it did not seem to put a load on, or shock the driveline at all. I just hit 2nd gear and pretty much coasted to the turnoff....... This engine is not a real powerhouse, maybe 430-440HP at the crank..... 1970 318 block .030 over, ported magnum heads 2.02 intakes, 4" crank forged pistons 9.7-1 C/R, Comp HE-275HL cam 231/237,1.6 roller rockers .565lift, hooker headers 1 3/4tube 3"collector and Torker 2 intake..... I think I may have gotten unlucky with a bad input shaft.....Now who has one for a 999 Lockup trans or do I have to scrounge around at the junky??? TBF
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Re: 904 trans died behind 390 stroker, time for 727????
[Re: tpabayflyer]
#139112
10/30/08 08:39 AM
10/30/08 08:39 AM
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Joined: Jan 2003
Posts: 75,098
A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,098
A Banana Republic near you.
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Quote:
Another question is the sprag.... The overrunning clutch issue with the 727's is a big deal whenever you have a driveline issue such as a rear end failure. I wonder if I should check it out??? When this thing snapped it did not seem to put a load on, or shock the driveline at all. I just hit 2nd gear and pretty much coasted to the turnoff....... This engine is not a real powerhouse, maybe 430-440HP at the crank..... 1970 318 block .030 over, ported magnum heads 2.02 intakes, 4" crank forged pistons 9.7-1 C/R, Comp HE-275HL cam 231/237,1.6 roller rockers .565lift, hooker headers 1 3/4tube 3"collector and Torker 2 intake..... I think I may have gotten unlucky with a bad input shaft.....Now who has one for a 999 Lockup trans or do I have to scrounge around at the junky??? TBF
The trans should be completely disassembled and checked out .
It's not HP that breaks stuff it's the TORQUE .
If it were me I wouldn't waste another penny on that trans .
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Re: 904 trans died behind 390 stroker, time for 727????
[Re: MoparDonny]
#139116
10/30/08 09:13 PM
10/30/08 09:13 PM
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Joined: Jan 2003
Posts: 75,098
A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,098
A Banana Republic near you.
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Quote:
Quote:
Another question is the sprag....
You wouldn't have damaged the sprag from breaking the input shaft. It's when something lets go behind the trans that you worry about the sprag.
Don
but he says he has a problem with no engine braking in first gear
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Re: 904 trans died behind 390 stroker, time for 727????
[Re: JohnRR]
#139118
10/30/08 09:41 PM
10/30/08 09:41 PM
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Joined: Nov 2004
Posts: 1,760
Port Alberni, British Columbia
MoparDonny
top fuel
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top fuel
Joined: Nov 2004
Posts: 1,760
Port Alberni, British Columbia
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Quote:
Quote:
Quote:
Another question is the sprag....
You wouldn't have damaged the sprag from breaking the input shaft. It's when something lets go behind the trans that you worry about the sprag.
Don
but he says he has a problem with no engine braking in first gear
 ...... Forgot about that John.  my bad.
Don.
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Re: 904 trans died behind 390 stroker, time for 727????
[Re: MoparDonny]
#139119
10/30/08 09:47 PM
10/30/08 09:47 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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normally I am a believer in listening to your gut but not this time. fix that part & give that 904 another chance
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: RapidRobert]
#139120
10/30/08 11:57 PM
10/30/08 11:57 PM
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Joined: Jan 2003
Posts: 1,586
Tampa, FL
tpabayflyer
OP
pro stock
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OP
pro stock
Joined: Jan 2003
Posts: 1,586
Tampa, FL
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I found this chart in an article from carcraft....... Mopar Automatic Transmission Guide This list is not conclusive or absolute, but provides general guidelines with respect to power ratings. Trans Year Small-Block Big-Block Stock Modified 904/998/999 '60 X -- D B 727 '62 X X A A 500 '88 X -- C C 518/618 '90 X -- A A Note: In place of a vacuum modulator, Chrysler automatic transmissions use a rod or a cable to control throttle pressure and kickdown. *Ratings: A = High torque, heavy car; B = High torque, light car; C = Low torque, heavy car; D = Low torque, light car I have a somewhat heavy car with a somewhat high torque engine and I think I am on the edge with this trans holding up....... I think I need some pepto bismol to quiet my gut down  TBF
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Re: 904 trans died behind 390 stroker, time for 727????
[Re: slantzilla]
#139124
10/31/08 08:07 AM
10/31/08 08:07 AM
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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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IMO..727 all the way add motor for the drag loss of a bigger tranny might not be the input shaft that lets go next time out then it becomes wasted $$$ and you will need the core 727 just to start over   let ya know what I see at the the u-pull it  
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Re: 904 trans died behind 390 stroker, time for 727????
[Re: RapidRobert]
#139125
10/31/08 08:50 AM
10/31/08 08:50 AM
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Joined: Jan 2003
Posts: 75,098
A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,098
A Banana Republic near you.
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Quote:
Quote:
I think I need some pepto bismol to quiet my gut down TBF
 Dont give up now you are so close & when it holds up the 2nd time you'll appreciate the fact that the lower weight(overall & rotating) is giving YOU a performance edge. You were ready to go for it until Johnrr chimed in & got you to thinking again 
Sure, I'll stop pointing out the OBVIOUS 
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