727 w/ transbrake
#3220937
03/16/24 11:57 PM
03/16/24 11:57 PM
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Joined: Aug 2009
Posts: 2,039 Mooresburg, Tn
'72CudaRacer
OP
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OP
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Joined: Aug 2009
Posts: 2,039
Mooresburg, Tn
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A friend has a 727 w/ a Turbo action transbrake valve body in it. When he stages the car and sets the transbrake, the car rolls forward slightly before it "sets". It releases and shifts fine, just won't set still. What causes this? Clutches slipping, loose band, too much end play, ect? All of the above? He hooked the line lock into delay box to release the same time as the transbrake and that seemed to be better, but I see that as a band aid. If the transmission (and valve body) is working correctly, he shouldn't need the line lock. Thanks, Brian
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Re: 727 w/ transbrake
[Re: '72CudaRacer]
#3220967
03/17/24 09:05 AM
03/17/24 09:05 AM
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Joined: Jan 2022
Posts: 138 Connellsville
71Demon528
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member
Joined: Jan 2022
Posts: 138
Connellsville
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I have an A&A transbrake valve body and I use the line lock function in my delay box when the trans brake is engaged. Before having line lock function, if I staged at higher RPM, when I pushed the trans brake button, the suspension then relaxes and car would move a little. The Higher the rpm the more it would settle. Although it may seem like a band aid, I can tell you from experience it works very well. Many many racers with glides, th350 and 400s also use the line lock function. It helps a lot with consistent staging of the car.
The glide uses a band to hold the drum stationary when in low gear. If band adjustment isn’t spot on, it can cause issues. Like DVW said, the High clutch is delaying engagement if you’re not staging at enough RPM. Adjusting the front band in a 727 will have no impact on trans brake. If the valve body is low band apply (which I’m not sure if your turbo action valve body is), then the low/reverse band adjustment can have an impact if it’s out of adjustment. I know turbo action makes a trans brake valve body that doesn’t use low band apply.
Last edited by 71Demon528; 03/17/24 09:12 AM.
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Re: 727 w/ transbrake
[Re: dvw]
#3221188
03/18/24 09:17 AM
03/18/24 09:17 AM
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Joined: Jan 2003
Posts: 13,357 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
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Turbo Action suggests going into staging at higher rpm when setting their brake. A forward roll would be due to a delay in the high clutch engaging. Doug I have a TA pro brake. If I don't go in at a real fast idle, it won't set.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: 727 w/ transbrake
[Re: an8sec70cuda]
#3221213
03/18/24 12:09 PM
03/18/24 12:09 PM
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Joined: Dec 2006
Posts: 2,105 Byron, NY
W.I.N. Racing
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Joined: Dec 2006
Posts: 2,105
Byron, NY
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Turbo Action suggests going into staging at higher rpm when setting their brake. A forward roll would be due to a delay in the high clutch engaging. Doug I have a TA pro brake. If I don't go in at a real fast idle, it won't set. Yep, historically problematic with TA trans brakes...Back in the early 90's I used one, the reverse spool would stick so no TB, Higher pump pressure is needed to overcome the stiction. I don't know if they are still building them using Devcon as a way to modify the VB passages, but that is what attributed to the issues I was having. Would have to take the VB out and apart, and wash the "Dust" out.
Last edited by W.I.N. Racing; 03/18/24 12:10 PM.
'01 P1500, Blown/Inj BAE,/Veney ,Bruno/CS2,Dana 60 '01 Dodge 3500 S Cummins Auto, Fresh air kit, 4" Exhaust, '05 Dodge Magnum R/T - Too Much to list '60 Willys CJ5 '01 International LPX - Project,DT466, Allison '64 Plymouth Valiant, Inj 528 Hemi, 2spd
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Re: 727 w/ transbrake
[Re: cudaman1969]
#3221391
03/19/24 10:53 AM
03/19/24 10:53 AM
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Joined: Jan 2003
Posts: 4,712 Moved to N.E. Tennessee
GomangoCuda
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master
Joined: Jan 2003
Posts: 4,712
Moved to N.E. Tennessee
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Just curious, is this a valve body issue or a transmission issue? Do all 727 trans brakes do this or only certain brands? Griners any better?
In theory, there is no difference between theory and practice. In practice, there is.
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Re: 727 w/ transbrake
[Re: GomangoCuda]
#3221441
03/19/24 01:47 PM
03/19/24 01:47 PM
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Joined: Nov 2003
Posts: 377 NW Indiana USA
727specialist
enthusiast
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enthusiast
Joined: Nov 2003
Posts: 377
NW Indiana USA
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Just curious, is this a valve body issue or a transmission issue? Do all 727 trans brakes do this or only certain brands? Griners any better? That is common for the Turbo action brake. It can be caused by internal problems in this case it is usually the valve body. The Griner brake does not have that problem it sets up at idle. Keith
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Re: 727 w/ transbrake
[Re: BTBelvedere]
#3221783
03/20/24 09:37 PM
03/20/24 09:37 PM
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Joined: May 2003
Posts: 13,185 aZLiViN
J_BODY
I Live Here
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I Live Here
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Posts: 13,185
aZLiViN
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I've never had a problem with my TranzAct. Happened in my Mirada. New stator support rings and it was rock solid again.
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