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trans brake not holding
#740556
07/04/10 09:48 PM
07/04/10 09:48 PM
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Joined: Jun 2004
Posts: 119 SE VA
hemibee69
OP
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OP
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Joined: Jun 2004
Posts: 119
SE VA
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727, Griner low band apply transbrake will not hold the car at the starting line. The electric side is ok because I can back up with it. I went down the track after it rolled the beams and all 3 gears seemed OK, but above about 2000rpm the car rolls forward with the brake applied. I wish it was something easy, but high gear clutch pack or it's sealing rings seems like the likely culprit. What else to check before pulling the trans? Any easy checks or fixes other than remove and teardown? Thanks
1969 Orig Hemi Super Bee Post 4 spd Red on Red (Sold sadly) 1970 Cuda Drag car 500" B1/BS 8.63 @ 155 mph 1970 Challenger SE 383 4 bbl A/C PB PS Leather 1971 Orig 440+6 Cuda 4 spd Shaker In-Violet
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Post deleted by Defbob
[Re: WILD BILL]
#740558
07/05/10 12:36 AM
07/05/10 12:36 AM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Re: trans brake not holding
[Re: 727builder]
#740561
07/05/10 02:17 AM
07/05/10 02:17 AM
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Joined: Nov 2004
Posts: 4,330 Lynchburg, VA
Leon441
master
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master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
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Rear band worn and out of adjustment.
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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Re: trans brake not holding
[Re: 506RR]
#740563
07/05/10 08:25 AM
07/05/10 08:25 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
My Turbo Action Transbrake would always creep a little as well. Do yourself a favor and just tie it to the Line Lock. That is the way everyone I know does it.
Either your line pressure is low or you could increase the revs before hitting the button... my TA brake has never creeped(it been in there about 10 years)
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Re: trans brake not holding
[Re: MR_P_BODY]
#740564
07/05/10 08:49 AM
07/05/10 08:49 AM
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Joined: Jun 2004
Posts: 119 SE VA
hemibee69
OP
member
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OP
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Joined: Jun 2004
Posts: 119
SE VA
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Thanks for all the replys, I do have it tied to the line-lock. The brake has always locked and held the car until this problem started.Air checking the high clutch pack with the valve body removed is something I did not think of. That will be the first thing to do after the valve body is out. I also had an early Turbo action transbrake before the Griner. The Engine RPM needed to be up for it to lock in as said earlier. The Griner is not like that.
1969 Orig Hemi Super Bee Post 4 spd Red on Red (Sold sadly) 1970 Cuda Drag car 500" B1/BS 8.63 @ 155 mph 1970 Challenger SE 383 4 bbl A/C PB PS Leather 1971 Orig 440+6 Cuda 4 spd Shaker In-Violet
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Re: trans brake not holding
[Re: hemibee69]
#740565
07/05/10 09:47 AM
07/05/10 09:47 AM
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Joined: May 2007
Posts: 446 oregon
savoyracer
mopar
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mopar
Joined: May 2007
Posts: 446
oregon
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I would do some easy checks before removing anything. #1 place a ground strap from the trans to the frame , or battery, in order to eliminate a grounding problem. #2 increase engine RPM's when staging, to ensure adequate line pressure. #3 charge the battery, and then do a battery check, to be absolutely positive you have the voltage, just because you can back up, does NOT mean that you have adequate voltage to set the brake!!. and #4, if you are using synthetic fluid, take it out, replace with a good quality non- synthetic fluid. Only after these checks would I look internally.
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Re: trans brake not holding
[Re: 65dragnet]
#740567
07/05/10 11:39 AM
07/05/10 11:39 AM
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Joined: Oct 2006
Posts: 200 AB
Efidart
enthusiast
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enthusiast
Joined: Oct 2006
Posts: 200
AB
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I had problems with my 727 creeping on the TB under boost with a t/a vb, I always activated the TB above 2000. Went through the whole trans and couldnt find a problem, we upped the line pressure with no change at all. It never became a problem until I started putting it to higher rpm's with boost on the TB.
I cured the problem by going to a turbo 400, now the car is rock solid on the TB at any rpm/boost.
TT Predator headed 572 7 Second Street Car. Fastest Mopar Drag Week 2015 Fastest Mopar & Dodge Drag Week 2017 Pro Street Power Adder Champion Drag Week 2017
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