School me on a transbrake
#3184281
10/15/23 10:55 PM
10/15/23 10:55 PM
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Joined: Jan 2003
Posts: 4,244 Canada
Kam*Kuda
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I am seriously considering a transbrake.
What are the things to consider?
The transmission has been fairly well built with a good drum. Street and strip
Info 1968 Road Runner Procharger 3770 lbs
Last edited by Kam*Kuda; 10/15/23 10:56 PM.
1970 Barracuda Convertible 1968 Satellite Street Strip car 1654.5 Mustang 1955 Land Rover
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Re: School me on a transbrake
[Re: Cab_Burge]
#3184316
10/16/23 09:07 AM
10/16/23 09:07 AM
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Kam*Kuda
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Which rear end is in it? What size drive shaft and which type and size U joints now CAb it’s a Dana 60 3.50” chrom moly drive shaft Iirc 1350 ujoints and a strange forged yoke. ( I just swapped as I cracked some bearings in the unjoint and twisted the yoke last year)
1970 Barracuda Convertible 1968 Satellite Street Strip car 1654.5 Mustang 1955 Land Rover
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Re: School me on a transbrake
[Re: 71Demon528]
#3184317
10/16/23 09:09 AM
10/16/23 09:09 AM
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Joined: Jan 2003
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Kam*Kuda
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Yes 727. billet steel drum Good sprag and parts Could use a billet output shaft
1970 Barracuda Convertible 1968 Satellite Street Strip car 1654.5 Mustang 1955 Land Rover
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Re: School me on a transbrake
[Re: Kam*Kuda]
#3184365
10/16/23 12:41 PM
10/16/23 12:41 PM
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Joined: Aug 2003
Posts: 43,303 Bend,OR USA
Cab_Burge
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Which rear end is in it? What size drive shaft and which type and size U joints now CAb it’s a Dana 60 3.50” chrom moly drive shaft Iirc 1350 ujoints and a strange forged yoke. ( I just swapped as I cracked some bearings in the unjoint and twisted the yoke last year) I have not race a727 with a trans brake for a long time so I have no real world current experience with one of todays trannies, my last race car had a glide in it and I would launch it at WOT on the tans brake which was between 5400 up to 5800 RPM depending on the track elevation and D.A., shifted between 7000 up to 7300 RPM, which was 2.0 MPH faster at the same ET On your deal it will depend on what RPM you want to launch the car, testing different ones will help find out what your car likes It looks like your car should hold up without parts breakage
Last edited by Cab_Burge; 10/17/23 01:29 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: School me on a transbrake
[Re: Kam*Kuda]
#3184367
10/16/23 12:47 PM
10/16/23 12:47 PM
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Joined: Dec 2006
Posts: 2,120 Byron, NY
W.I.N. Racing
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Things to investigate - Converter anti ballooning plate - a bleed hole in the front Drum (facilitates quicker releases) - Good quick release Brake Button - Transmission shield - Sprag (doesn't have to be a bolt in but make sure its in perfect condition) - Move Vent front Pump cover to tail housing - Good front yoke - Rear Planetary set - likes to rip out the spline Thats my
'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: School me on a transbrake
[Re: W.I.N. Racing]
#3184377
10/16/23 01:23 PM
10/16/23 01:23 PM
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Joined: Jan 2003
Posts: 2,937 A shed in England
Tig
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Things to investigate - Converter anti ballooning plate - a bleed hole in the front Drum (facilitates quicker releases) - Good quick release Brake Button - Transmission shield - Sprag (doesn't have to be a bolt in but make sure its in perfect condition) - Move Vent front Pump cover to tail housing - Good front yoke - Rear Planetary set - likes to rip out the spline Thats my just my but I'd add a pro rear gear set to that list
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: School me on a transbrake
[Re: W.I.N. Racing]
#3184390
10/16/23 02:47 PM
10/16/23 02:47 PM
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Joined: Jan 2003
Posts: 25,988 Rio Linda, CA
John_Kunkel
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- Rear Planetary set - likes to rip out the spline
I'm sure you meant front.
The INTERNET, the MISinformation superhighway
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Re: School me on a transbrake
[Re: W.I.N. Racing]
#3184435
10/16/23 07:04 PM
10/16/23 07:04 PM
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Joined: Jan 2003
Posts: 4,244 Canada
Kam*Kuda
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Things to investigate - Converter anti ballooning plate. 👍 - a bleed hole in the front Drum (facilitates quicker releases) I assume this can be done when the brake is installed?- Good quick release Brake Button do you normally put this on the steering wheel?- Transmission shield👍 - Sprag (doesn't have to be a bolt in but make sure its in perfect condition)👍 - Move Vent front Pump cover to tail housing. will need to check - Good front yoke - Rear Planetary set - likes to rip out the spline. no idea… any more details on this ?Thats my [/quote]
Last edited by Kam*Kuda; 10/17/23 12:39 PM.
1970 Barracuda Convertible 1968 Satellite Street Strip car 1654.5 Mustang 1955 Land Rover
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Re: School me on a transbrake
[Re: Kam*Kuda]
#3184465
10/16/23 08:57 PM
10/16/23 08:57 PM
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Joined: Jan 2022
Posts: 147 Connellsville
71Demon528
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I second what everyone says. The billet drum and ultimate sprag are the biggest concerns so since you already have them, youre in good shape. I will add, put a steel front planetary in the transmission, aluminum stock front planets are know to strip out the splines. The bleed hole to the front drum needs to be done. Some put it in the piston but its recommended to do the drum. Once you do that you need to move the vent to the rear because with fluid escaping the drum through the bleed hole can cause a leak out of the front pump vent. I haven't experienced that personally but I know that is the theory. If you put the bleed hole in the piston opposed to the drum, you may not have to move the vent.
Definitely a steel stator in the converter as the aluminum one will absolutely explode. Being that its a street car as well, your gears are "harder" than a pro gear, so you may want to consider that before installing the trans brake. My richmond pro 4.56 gears have over 200 runs on them. My US 4.30 pro gear both sets lost pinion at 200 runs almost exactly. The richmond seems to be happier knock on wood. Like any race car part, they last until they don't.
As far as a button goes, I have mine on the steering wheel, but know others prefer it mounted elsewhere away from the wheel.
You are going to want to wire in a relay so that when the transbrake is activated, the line lock also activates so the car does not creep. If you don't wire in the relay which activates the line lock when the trans brake is activated, just stage at low of an idle as you can before hitting the button to avoid the least amount of load on the chassis. Once you activate the trans brake, if you are at a high idle, without line lock, the chassis will relax and car will rock forward.
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Re: School me on a transbrake
[Re: Kam*Kuda]
#3184472
10/16/23 09:35 PM
10/16/23 09:35 PM
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Joined: May 2005
Posts: 4,757 Florida
BDW
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Which rear end is in it? What size drive shaft and which type and size U joints now CAb it’s a Dana 60 3.50” chrom moly drive shaft Iirc 1350 ujoints and a strange forged yoke. ( I just swapped as I cracked some bearings in the unjoint and twisted the yoke last year) What's the doohickey bolt in the rearend? Some sort of sensor?
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Re: School me on a transbrake
[Re: Kam*Kuda]
#3184500
10/16/23 11:58 PM
10/16/23 11:58 PM
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Joined: Jan 2003
Posts: 20,212 Park Forest, IL
slantzilla
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just my but I'd add a pro rear gear set to that list I just bought some new3.73 gears. How long do pro gears last. Please note that this is a street car too In all honesty, unless you're seriously going to race I'd not bother with a brake.
"Everybody funny, now you funny too."
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Re: School me on a transbrake
[Re: Kam*Kuda]
#3184518
10/17/23 04:55 AM
10/17/23 04:55 AM
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Joined: Jan 2003
Posts: 2,937 A shed in England
Tig
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just my but I'd add a pro rear gear set to that list I just bought some new3.73 gears. How long do pro gears last. Please note that this is a street car too I've had to switch to the harder but more brittle, street gears too as Pro Gears in 3.73 (lower numerically than 4:10) are no longer available for a Dana 60. I have only done a dozen passes on them but I intend to inspect every season. I footbrake BTW (best 60ft is now a 1.29), a good 9" type rear is on the list for the future. Below is a Dana 4:10 street gear which had around 120 passes before they let go, about 90% of the teeth were like this and the discoloration on the breaks pointed towards an inclination to believe that they may have been cracked for some time. The issue with the transbrake is the backlash isn't taken up throughout the drive train, like it can be on a footbrake and this adds to the "shock" on the rear gear as the backlash is taken up. The Soft pro gears give a little but the caveat is they wear quicker. How quickly will depend on driving style and how well they were set up, the whine will let you know when they need replacing
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: School me on a transbrake
[Re: slantzilla]
#3184551
10/17/23 08:28 AM
10/17/23 08:28 AM
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Joined: Jan 2003
Posts: 13,401 Marion, South Carolina [><]
an8sec70cuda
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just my but I'd add a pro rear gear set to that list I just bought some new3.73 gears. How long do pro gears last. Please note that this is a street car too In all honesty, unless you're seriously going to race I'd not bother with a brake. I would have to agree w/ this. I have a transbrake in my car, but I'd rather footbrake it. Doesn't make much difference in how it runs. I did it simply for running pro tree classes. I suck on the tree anyway so, lol.
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: School me on a transbrake
[Re: an8sec70cuda]
#3184563
10/17/23 09:35 AM
10/17/23 09:35 AM
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Joined: Jul 2003
Posts: 151 Indianapolis, In. area
BTBelvedere
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I put a brake in the Belvedere soley to run a delay box. It didn't improve ET's at all. Back in the 90's, they decided to run pro and super pro as one class. It didn't take too long to figure out that I couldn't hang with the delay box crowd. I bought a brake from Joe at TranzAct. It worked great (still does). Bought a cheap delay box and went racing. At first, I let go of the button at the first flash and mashed the pedal on the bottom bulb, or I thought I did. The first thing I broke was the crankshaft. I eventually broke everything in the drive line, one piece at a time, before finally getting a 2 step. I don't know what RPM I was actually leaving at before, but it was sure way higher than the 3000 chip I ended up with. I'll also never forget the big, bold warning/disclaimer at the bottom of the instruction page. SERIOUS INJURY OR DEATH MAY OCCUR. Oh, the good old days.
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Re: School me on a transbrake
[Re: John_Kunkel]
#3184586
10/17/23 12:06 PM
10/17/23 12:06 PM
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Joined: Dec 2006
Posts: 2,120 Byron, NY
W.I.N. Racing
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- Rear Planetary set - likes to rip out the spline
I'm sure you meant front. Yes I did
'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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