trans brake - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1970chevy · 07-20-2008, 01:43 AM

just wondering if any body out their has install a transbrake in a th400 how hard is it do you have to pull the tranny out i just pick up a b&m trans brake with rev valve body trying to find some good pictures of instilling it b&m gives crap of instiction

Marv D · 07-20-2008, 10:31 AM

There is more to it than just bolting in a valvebody. At least to make it survive there is. If your not familiar with the whole scenario I'd HIGHLY suggest you take it to a good trans shop and have the trans built for the brake. Most of the stock components will survive only a short time under the rigors of a transbrake launch.

PA-IndianRider · 07-21-2008, 06:13 AM

Quote:

Originally Posted by Marv D

There is more to it than just bolting in a valvebody. At least to make it survive there is. If your not familiar with the whole scenario I'd HIGHLY suggest you take it to a good trans shop and have the trans built for the brake. Most of the stock components will survive only a short time under the rigors of a transbrake launch.

All of the "drag race" friends I have have told me the same thing. Let a PRO handle it.

**regan wilson** · 07-21-2008, 02:37 PM

There are too many modifications to be done inside . It has to come apart . I run a Hipster brake . Nine years ago when I put my truck back together I did alot of research on this and one of my friends builds my transmissions . We have gotten it to where it survives pretty well . We usually tear it down once a year . Usually we replace a bushing or two maybe one or two clutches and steels . It is amazing how much stock TH400 parts can take . I can tell you alot of little tricks that will help it survive . Three good ones are, drilling out the center support bolt so more fluid can go to the second gear clutches , using a stock type wave plate in the case for second gear , and putting a good cross hatch on the sprag surface everytime you have it down .(these are for sprag survival) . Another important thing on a TH400 is high gear clutch clrearance ! Dont be afraid to put 100 to 110 thou of clearance in them . The reason for this is when the tranny is in low gear those clutches are turning 1.5 times engine speed backwards .

1970chevy · 07-22-2008, 08:10 PM

thanks

Ford Assassin · 08-16-2008, 06:48 PM

A buddy of mine tried the DIY route, ended costing more in the end.

Rodms · 08-18-2008, 02:58 PM

Need to take it to someone that knows how to build racing trans so you won't tear up all the other stuff

hotrod 80 · 08-20-2008, 01:16 PM

Just took the glide in to the shop for bell housing change and freshin up . Grand total $150 . Not worth messin with in my opinion .

07-20-2008, 01:43 AM	#1
1970chevy Registered User Join Date: Mar 2005 Location: usa Posts: 142	trans brake just wondering if any body out their has install a transbrake in a th400 how hard is it do you have to pull the tranny out i just pick up a b&m trans brake with rev valve body trying to find some good pictures of instilling it b&m gives crap of instiction

07-20-2008, 10:31 AM	#2
Marv D Registered Truck Offender Join Date: May 2008 Location: hells training ground (aka Ariz) Posts: 3,118	Re: trans brake There is more to it than just bolting in a valvebody. At least to make it survive there is. If your not familiar with the whole scenario I'd HIGHLY suggest you take it to a good trans shop and have the trans built for the brake. Most of the stock components will survive only a short time under the rigors of a transbrake launch. __________________ Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral.

07-21-2008, 02:37 PM	#4
regan wilson Senior Member Join Date: Mar 2008 Location: tyler texas Posts: 1,531	Re: trans brake There are too many modifications to be done inside . It has to come apart . I run a Hipster brake . Nine years ago when I put my truck back together I did alot of research on this and one of my friends builds my transmissions . We have gotten it to where it survives pretty well . We usually tear it down once a year . Usually we replace a bushing or two maybe one or two clutches and steels . It is amazing how much stock TH400 parts can take . I can tell you alot of little tricks that will help it survive . Three good ones are, drilling out the center support bolt so more fluid can go to the second gear clutches , using a stock type wave plate in the case for second gear , and putting a good cross hatch on the sprag surface everytime you have it down .(these are for sprag survival) . Another important thing on a TH400 is high gear clutch clrearance ! Dont be afraid to put 100 to 110 thou of clearance in them . The reason for this is when the tranny is in low gear those clutches are turning 1.5 times engine speed backwards . __________________ NHRA Super Street 469C It only runs 10.90 at 156 mph

07-22-2008, 08:10 PM	#5
1970chevy Registered User Join Date: Mar 2005 Location: usa Posts: 142	Re: trans brake thanks

08-16-2008, 06:48 PM	#6
Ford Assassin Registered User Join Date: Jun 2008 Location: Jackson, Ca. Posts: 674	Re: trans brake A buddy of mine tried the DIY route, ended costing more in the end. __________________ Cable -K5 Blazer 2wd: 6.0 LQ4, 7875 Turbo, Tick Stage II Turbo Cam, Built 4L80e, RevMax Billet 3600, 9.5" 14 Bolt -Chevy 3+3 Crew Cab Dually: Cummins 12v P-Pump Swap, Compound Turbos, A2W Intercooler, NV4500HD, 4wd conversion, Radius Arms, Coilovers, Crossover Steering, etc Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=803608

08-18-2008, 02:58 PM	#7
Rodms Registered User Join Date: Jul 2008 Location: Olive Branch,Mississippi Posts: 347	Re: trans brake Need to take it to someone that knows how to build racing trans so you won't tear up all the other stuff __________________ Built chevy tuff!

08-20-2008, 01:16 PM	#8
hotrod 80 mini truck racer Join Date: Aug 2006 Location: Baytown , texas Posts: 3,010	Re: trans brake Just took the glide in to the shop for bell housing change and freshin up . Grand total $150 . Not worth messin with in my opinion . __________________ 1949 5-window 1969 Camaro 1976 Chevy Luv yellow 1978 Chevy Luv Blue 1976 Chevy Luv Black 1979 Firebird Flooded in Harvey 1999 F350 Dually 2005 GMC Sierra 4.8 RCSB 2014 Explorer (wifes) My build :http://67-72chevytrucks.com/vboard/s...d.php?t=399148 Build #2: http://67-72chevytrucks.com/vboard/s...d.php?t=653583



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