Transbrake

[vwdragster]

I finally got my car out to the track. It has a new ATI Powerglide. The first pass it ran well on top end 124mph, but had a terrible 60 ft. time 1.40( BBC Dragster). The second pass it would not stop in lights using the trannybrake. It rolled forward. I checked the band adjustment and the brake work three time in a row in the pits. Tried again, did the burnout and brake wouldn't hold the car again :evil: ! I am pretty new to the powerglide thing, and any help would be appreciated!!!!! It seems to shift good, and the fluid level is fine. The converter has 4 passes(Coan) and the tranny has 8 passes.

[davis419b]

Do you have a delay box, if so what kind?

[gdmii]

If the band was out of adjustment (loose) it would more than likely back up on you versus going forward. I would check all connections. Also, what brand of transbrake solenoid do you have?

George

[vwdragster]

It has a digital delay box and a the ATI solenoid. There is a light that comes on the delay box when I push the button. You can hear the solenoid click when you mash the button.
Thanks for replying!

[davis419b]

Do you have to push the transbrake button to back up after your burnout?

[vwdragster]

no

[davis419b]

I thought maybe you had a transbrake lockout feature that might have been activated when you backed up and did not have time to cancel before you tried to stage but evidently not. By looking at the 1.40 60' i would say you must have something wrong inside of the valve body. That is very slow for any BBC in a dragster!

[vwdragster]

I agree that the 60' stinks. The car seems to run good except for the 60'. The 60' has been way slow since the car has been put together. It doesn't seems to really take off until about midway through 1st. The motor seems to run strong and everything on the motor checks out good.

[davis419b]

Whats the story on the converter?

[zipper06]

I have only see this happen one time and it wasn't to me, but a friend of mine runs an electric shift valve body (same as i do) and the brake wasn't holding and the 60' fell off really bad.
It turned out that he had some junk metal in the valve body and the brake piston was not releasing all the way nor fully ingaging, even though the electronics was working. He then put a magnet in the bottom of the trans pan.
After he cleaned the valve body everything was back to normal, like i said it didn't happen to me and we both use the same trans builder, and normally get 300 passes without freshing up on 3,000lb cars.
O'h and we have to push the trans brake button to back up.

Just a suggestion,

Zip.

[vwdragster]

When I bought the car it came with the car. It was a 9 inch. Not sure what kind. I bought a new coan 8 inch, thinking it would help. It improved the 60' a little 1. 31, but the last time out it had a 1.40 and then the last two passes I had the tranny brake issue. 5800 stall speed, seems to work good.

[davis419b]

It looks like Zip and I both agree you have a problem within the valve body! Get it checked out and I think you will solve your problem.

[SST4530]

I had this happen with TH400 where it wouldn't hold during stageing and a couple of clutch packs were burned. It was a brand new unit. Not sure about a glide though

[us7race]

Sounds like a solenoid problem to me and too tight of a converter.
I had the same issue with a solenoid I could hear it click in the pits then once I did my burnout it would not hold and it is too loud to hear it click or not so I changed the solenoid and that issue was fixed. But I wasn't having the slow 60' that is why I think the converter is too tight.
How big is it suppose to be? If you unplug the 2-tep how high will it go under full throttle?

[vwdragster]

I think I will pull the pan and valve body. Everything else seems to be okay. I will let everybody know what happens. Thanks for the responses and Merry Christmas! And by the way, to make everything else worse, my tow vehicle would not start after all this happened! My brother hit the distrubtor body a couple of time and it started :D Another day in paradise!!!!

[jmarksdragster]

60 ft should be in the 1.20's or better. Check and make sure your line pressure it at least 200 psi. Sounds like valve body too.