has anyone here ever seen or heard of a trans brake of a 700R4?

 

It's expensive. Most people who race don't even want to consider a transbrake in a 700R4. From what I've read, they don't want to pick up tranny pieces off the starting line.

Here's one place that sells them. http://www.tksspeedshop.com/
Also check out this site. http://www.torquedriveinc.com/

 

Do you really hate your 700r4 that much to put a trans brake in it??? LOL I'd give it a couple launches with slicks and you'll be buying a th400 with a brake...

 

i want to keep the 700R4 for now because of the big ratio in 1st gear 3.06:1 and also overdrive .70:1 alows me to still drive on the street. i dont bracket race(yet) or have huge HP/Torque but still like to test and tune.

who sells the parts from torque drive? any ideas on cost?

 

And that's why the 700R4 will only be a street tranny. When you're ready to race get a Th350 or TH400. If you feel you need an OD, then invest in a 200-4R. It has similar ratios to the Th350 but also has an OD. It's a better tranny and has a better performance parts supply than the 700R4.

The huge ratio drop between 1-2 in the 700R4 makes it a very bad choice for drag racing. It drops the engine rpm too far out of the powerband on the shift.

 

Told a buddy of mine that and he still went and got the 700R4 put into his car replacing a TH350. It went from being a 12.17 second car down to a 12.83. There were some other changes made but the transmission just sucks in his car and he hates it now.

 

does the trans brake really break alot of parts i have a turbo 350 in the camino and want to put one in. what is the adv and disadv to it

 

Depends on the tranny. I've used a TH400 with a transbrake and now use a powerglide.

The transbrake puts the transmission in first and reverse. This locks the transmission so that no power goes out. In order for the transbrake to put the transmission in reverse while you already have it in first, it must activate the rear band/clutches. If they're old, worn out out of adjustment, they won't hold. Using a transbrake also needs the line pressure increased. Usually around 250 psi of oil pressure is going through the galleries.

When you release the transbrake the reverse circuit is dumped and the car launches forward at whatever stall rpm you were at (depends on the converter or the 2 step setting). The weak link is the violent shock to the transmission and driveline when this is done. Think of taking an engine to 5000+ rpm with a manual transmission and dropping the clutch. If the parts are weak factory production parts then something is going to give. Most of the time it's u-joints.

To say if the tranny will survive or not you really need to see the internal design of each. The TH400 is the strongest especially with things like a center support to support all the internal parts. TH350 and 700R4 when you look at how the internal parts are arranged compared to a TH400 you'll realize just how weak these trannys are. The Powerglide is a very simple, small, lightweight tranny with very few internal parts that can fail.

My powerglide has a Pro brake in it. This means that the tranny can only be put in reverse when the shifter is either in reverse, neutral or first AND the transbrake button is pressed. Just putting it in reverse won't do anything and because of that, there's no way to accidently put it in reverse or apply the transbrake when in high gear. My TH400 worked like normal except the transbrake would only work when the tranny was in first gear. There was no effect in any other gear. TH350 brakes are similar.

A transbrake is a drag race only item. There is no disadvantage to having one. The advantage is being able to lock the transmission and being able to bring the engine's rpms up to the converter's full stall speed if needed. My converter stalls at 5700 rpm on the transbrake but I only launch at 4000. That allows the converter to flash and lessens the shock to the tires.

 

After stepping up to drive the trk this year with the t-brake I must have one for the car when the new drivetrain is done this spring. Right now with my convertor in the car it flashes to 3600 at launch, but I can only hole it by the break/2 step at 2200 and this makes for a slow leaving ride, I literally have to trip the stage bulb and then go in 2 pumps deeper to be able to get 5teen lights letting go at a flash of yellow on the 3rd bulb. With the t-brake like Stephen said you can go all the way up on the convertor if you want, but unless your chasis is tuning 100% you'll usually over power the tires and spin a little. We actually had better 60' times leaving with a lower chip AND the t-brake will allow you to custom fit your R/T. I was constently going red on a .500 pro tree cutting .420-.450 leaving on a flick of yellow. Went down to a 3600 chip and now I got the Truck dialed into my R/T on a .500 sporstman tree leaving on a flick of yellow and getting .505-.51? RT Once you use one you'llk be sold, just sucks you have to bullet proof everything to handle them from the tranny, convertor, driveshaft, u-joints, gears, axles. But they are also an advantage if your chasis is dialed since there is no preload anywhere it allows the chasis to do it's thing.

 

I loved my first gear in my 700R4 and missed it when I downgraded to the Th350 so when I got the Th400 built I got a custom low TCI gearset with a manual valve body and a tranny brake. I have to hold the brake to back up but it makes for some really killer launches. I had tons of people thinking I was cheating while racing them this year .

 

does anyone know just what all I would have to change out to take my 4l60E out of my 01 z28 and put in a turbo 350 or 400 with a trans brake..

Or does anyone know a good place to put in a trans brake on a 4l60E.
Or anyone have one istalled

Thanks

 

There's a sticky at the top of the trans form that details what is involved with putting a th400 in.

A trans brake in a 4L60 is a serious waste of money, if you're making enough power or going fast enough to need one, then you're already well beyond the limits of a 4L60. - A th350 is not far behind.