Trans break not working after switching Cases

cal · 03-25-2016, 08:40 PM

Hello All.
We pulled the motor and treans out of our S/ST Camaro last fall to freshen everything up.

As it turns out the Stock Case Power Glide bell was split about 3/4 of the way around.
So I bought a ATI Case and Bell. Had a local trans guy switch everything from the stock case trans,
to the new ATI case.

Now the trans brake won't work, I have been told to pull out the rod and drill and tape it with a pan head screw.

I have been told I need to weld a tip on the end of the shaft.

I'm not a trans guy, what is all this about.

Is there a longer shaft that can be bought or do I really need to do 1 of the above fixes. is this common or just my dumb luck.

Slightly confused, how do I resolve this problem?

Cal
S/ST 1177

Shake & Bake · 03-26-2016, 12:14 AM

What makes you think it's something internal? I would make sure the Transbrake Solenoid had 12/volts going to it and you had a good ground first. Not unless you already been there-done that. Then I would make sure there was not an issue with the trans brake button or the cord.

Keep us posted. Good Luck........

Tom Goldman · 03-28-2016, 12:37 PM

Valve body alignment on the bolts can change the clearance on the exhaust valve .
I've seen some move as much a .050" ,which can make the difference between the brake working or not.
Do you have a can solenoid or a pancake type ? ...The can type have more travel than the pancake and usually don't run into this problem .
Also the ATI case comes with red shim washers that are intended to move the solenoid out to minimize the depth the valve goes in, did your builder use any of these without checking the depth of the valve ?

Bill Baer · 03-29-2016, 11:17 PM

If the problem is not electrical (I.e. The solenoid is working) take the trans back to the Trans guy.
In my experience the ATI case is a direct replacement for the GM powerglide case.
Something's not lining up or missing or miss assembled.
Let us know what you find out.

Herbie Null · 03-30-2016, 09:26 AM

sounds like you have an early model valve body, is the top hole tapped and plugged with the bottom hole drilled? You may have to modify the case or call ATI and get the correct valve body. Either one will work, call ATI they will explain what's going on. I have had this problem before and correcting the pump passage fix the problem.

03-25-2016, 08:40 PM	#1
cal Member Join Date: Mar 2007 Location: southern md Posts: 370 Likes: 39 Liked 30 Times in 17 Posts	Trans break not working after switching Cases Hello All. We pulled the motor and treans out of our S/ST Camaro last fall to freshen everything up. As it turns out the Stock Case Power Glide bell was split about 3/4 of the way around. So I bought a ATI Case and Bell. Had a local trans guy switch everything from the stock case trans, to the new ATI case. Now the trans brake won't work, I have been told to pull out the rod and drill and tape it with a pan head screw. I have been told I need to weld a tip on the end of the shaft. I'm not a trans guy, what is all this about. Is there a longer shaft that can be bought or do I really need to do 1 of the above fixes. is this common or just my dumb luck. Slightly confused, how do I resolve this problem? Cal S/ST 1177

03-26-2016, 12:14 AM	#2
Shake & Bake Member Join Date: Mar 2010 Posts: 299 Likes: 35 Liked 32 Times in 28 Posts	Re: Trans break not working after switching Cases What makes you think it's something internal? I would make sure the Transbrake Solenoid had 12/volts going to it and you had a good ground first. Not unless you already been there-done that. Then I would make sure there was not an issue with the trans brake button or the cord. Keep us posted. Good Luck........

03-28-2016, 12:37 PM	#3
Tom Goldman VIP Member Join Date: Jan 2003 Location: Allentown,PA Posts: 2,436 Likes: 776 Liked 700 Times in 204 Posts	Re: Trans break not working after switching Cases Valve body alignment on the bolts can change the clearance on the exhaust valve . I've seen some move as much a .050" ,which can make the difference between the brake working or not. Do you have a can solenoid or a pancake type ? ...The can type have more travel than the pancake and usually don't run into this problem . Also the ATI case comes with red shim washers that are intended to move the solenoid out to minimize the depth the valve goes in, did your builder use any of these without checking the depth of the valve ? __________________ Tom Goldman 1500 SG , 1506 STK

03-29-2016, 11:17 PM	#4
Bill Baer Senior Member Join Date: Jul 2007 Location: Nothern IL Posts: 596 Likes: 1 Liked 1 Time in 1 Post	Re: Trans break not working after switching Cases If the problem is not electrical (I.e. The solenoid is working) take the trans back to the Trans guy. In my experience the ATI case is a direct replacement for the GM powerglide case. Something's not lining up or missing or miss assembled. Let us know what you find out. __________________ Bill Baer 3391 SC, 339B SC, QR

03-30-2016, 09:26 AM	#5
Herbie Null Member Join Date: Aug 2008 Location: greencastle pa Posts: 198 Likes: 52 Liked 286 Times in 55 Posts	Re: Trans break not working after switching Cases sounds like you have an early model valve body, is the top hole tapped and plugged with the bottom hole drilled? You may have to modify the case or call ATI and get the correct valve body. Either one will work, call ATI they will explain what's going on. I have had this problem before and correcting the pump passage fix the problem. Attached Thumbnails __________________ Herbie Null 201 SS