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Re: 727 lasted 8 passes
[Re: J_BODY]
#797700
11/29/10 02:25 PM
11/29/10 02:25 PM
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Joined: Mar 2009
Posts: 1,058
bigfork mn
dragram440
OP
super stock
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OP
super stock
Joined: Mar 2009
Posts: 1,058
bigfork mn
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Well I finally got my tranny back to the tranny guy and he said it broke the rear bolt in sprag and wrecked the case. He said it could possibly be from driver error even though I drove the car just as he told me to.
Last edited by dragram440; 11/29/10 02:50 PM.
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Re: 727 lasted 8 passes
[Re: 71440dart]
#797702
11/29/10 03:39 PM
11/29/10 03:39 PM
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Joined: Jan 2003
Posts: 75,042
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,042
U.S.S.A.
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Quote:
Quote:
Well I finally got my tranny back to the tranny guy and he said it broke the rear bolt in sprag and wrecked the case. He said it could possibly be from driver error even though I drove the car just as he told me to.
i had the same thing happen with that valve body, mine was from driver error, but i didnt tear up the case, it did tear up the bolt in sprag, i thought thats what the bolt in sprag was for, to save the case?
No, the bolt in sprag is to REPAIR a case that has had the outer race spin but not enough to ruin the case. Unless you buy the A+A or Coan Super/Ultimate sprags, they have more rollers and make it virtually impossible to have a sprag failure, you can still lay the rollers over in a bolt in. All the bolts do is stop the outer race from spinning in the case.
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Re: 727 lasted 8 passes
[Re: dragram440]
#797704
11/29/10 04:45 PM
11/29/10 04:45 PM
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Joined: Feb 2004
Posts: 1,093
Long Beach, CA
Mike Swann
super stock
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super stock
Joined: Feb 2004
Posts: 1,093
Long Beach, CA
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9 out of 10 Coan converters require a bell housing spacer. Did you install one if required?
8.30's @3400 lbs
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Re: 727 lasted 8 passes
[Re: Mike Swann]
#797705
11/29/10 05:23 PM
11/29/10 05:23 PM
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Joined: Mar 2009
Posts: 1,058
bigfork mn
dragram440
OP
super stock
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OP
super stock
Joined: Mar 2009
Posts: 1,058
bigfork mn
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No spacers in it. It looked to me you only needed them if you were running a mid plate or if the converter was to far back. Would that cause the rear sprag to go south.
67' charger 499 RB
10.57 at 127
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Re: 727 lasted 8 passes
[Re: JohnRR]
#797708
11/29/10 10:23 PM
11/29/10 10:23 PM
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Joined: Sep 2003
Posts: 2,175
Duloc
The Shadow
top fuel
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top fuel
Joined: Sep 2003
Posts: 2,175
Duloc
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Quote:
Quote:
Quote:
Well I finally got my tranny back to the tranny guy and he said it broke the rear bolt in sprag and wrecked the case. He said it could possibly be from driver error even though I drove the car just as he told me to.
i had the same thing happen with that valve body, mine was from driver error, but i didnt tear up the case, it did tear up the bolt in sprag, i thought thats what the bolt in sprag was for, to save the case?
No, the bolt in sprag is to REPAIR a case that has had the outer race spin but not enough to ruin the case. Unless you buy the A+A or Coan Super/Ultimate sprags, they have more rollers and make it virtually impossible to have a sprag failure, you can still lay the rollers over in a bolt in. All the bolts do is stop the outer race from spinning in the case.
The case can still get broken with a bolt in sprag. The rollers can get jammed so hard that they spread the outer race of the sprag, expand it and crack the case. Don't ask me how I know 
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Re: 727 lasted 8 passes
[Re: CHAPPER]
#797711
11/29/10 11:43 PM
11/29/10 11:43 PM
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Joined: Aug 2009
Posts: 2,047
Mooresburg, Tn
'72CudaRacer
top fuel
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top fuel
Joined: Aug 2009
Posts: 2,047
Mooresburg, Tn
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I build my own 727's, but not too often. The one in the car now was run for 2 years, freshened up and then sat for 13 years before I disassemblled it, checked every thing and reassembled it (only new parts on the freshen up were seals, and clutches). The transmission was then installed and I have run it for 3 seasons (300 plus passes per season). It will be freshened up this winter. My car car is a foot brake car that leaves with the front tires in the air every pass. 60' 1.37, 1/8 6.53/105, 1/4 10.38/127.
Don't let anyone tell you that a Turbo Action RMVB won't work, I've had mine for 25 years. The convertor is a Turbo Action 17509J. It has been repaired 3 times in 10 racing seasons.
I agree with others, you need a new trans guy. That guy can be you.
Brian Dunnigan
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Re: 727 lasted 8 passes
[Re: FastmOp]
#797714
11/30/10 10:57 AM
11/30/10 10:57 AM
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Joined: Jan 2003
Posts: 8,940
Holly/MI
Dean_Kuzluzski
master
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master
Joined: Jan 2003
Posts: 8,940
Holly/MI
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Not sure if I'm qualified to post in this forum............haven't raced in a few years. But, I have rebuilt a 727 lately and I also recommend doing it yourself. The only "special tools" you'll need is an inch-pounds torque wrench, some snap-ring pliers, dial-indicator & stand/clamp, feeler gauges and a makeshift workbench with a hole in it to load the tailshaft/low-rev drum into the case. The recommended book by Munro and a FSM will cover nearly every question stock or modified. What isn't clear you can ask about it here. The 727/904 is a VERY basic planetary-style transmission. 
R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04
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but your tranny guy is flatly wrong, there are other materials other than ferrous metals in a transmission. 
