th400 transbrake install - Chevelle Tech
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post #1 of 30 (permalink) Old May 28th, 08, 11:37 AM Thread Starter
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th400 transbrake install

We had our second MSRA race on Memorial Day and as soon as I got home, the car was on the stands to be ready to take the trans out.

The trans is now out and on the bench and I've begun the install process.

I've never worked on a th400 internally before, so I'm learning as I go. It's not near as bad to work on as I had thought all these years. I'm enjoying learning how to work on is as I intend to try and be able to maintence the transmission from here on out.

Anyway, all the parts came in and I should be able to button the trans up in about 2 hours or so.

I won't make it to test this weekend, but may try for the following.

Parts used during the install are:

- Griner Pro Start trans brake (internal solenoid)

- ATI forget/billet forward clutch hub

- ATI gasket/seal kit

- PTC 8" converter

- MSD 8735 3 step "Launch Control"

- Biondo "Double O" button

















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post #2 of 30 (permalink) Old May 28th, 08, 11:55 AM
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Re: th400 transbrake install

i think its cool to take on a new challenge. hopefully the new converter will work out for you. Im using PTC and its been good to me so far.
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post #3 of 30 (permalink) Old May 28th, 08, 12:01 PM
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Re: th400 transbrake install

They will probally have you set the clutch pack clearance up at .055"-.070"
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post #4 of 30 (permalink) Old May 28th, 08, 12:12 PM
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Re: th400 transbrake install

Say, where can I get me some of those nifty BettyCrocker parts containers?

Looks good, Todd!

Again..........more clutter please.
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post #5 of 30 (permalink) Old May 28th, 08, 6:44 PM
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Re: th400 transbrake install

Here is a link to Jakeshoe's excellent rebuild article. Replace anything that is worn and blow everything off with the air nozzle before you put it in. You can put the pump together without the giant hose clamp, but having one makes it easier. With a TB, you will be throwing a lot of parts in the "save-for-future-projects" bin.

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post #6 of 30 (permalink) Old May 28th, 08, 10:21 PM Thread Starter
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Re: th400 transbrake install





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post #7 of 30 (permalink) Old May 28th, 08, 10:26 PM
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Re: th400 transbrake install

Quote:
Originally Posted by 10secBu View Post




Get the wheelie bars on order

Whats that transbrake run now, about $650 ?
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post #8 of 30 (permalink) Old May 28th, 08, 10:26 PM Thread Starter
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Re: th400 transbrake install

Quote:
Originally Posted by kirkwoodken View Post
Here is a link to Jakeshoe's excellent rebuild article. Replace anything that is worn and blow everything off with the air nozzle before you put it in. You can put the pump together without the giant hose clamp, but having one makes it easier. With a TB, you will be throwing a lot of parts in the "save-for-future-projects" bin.
No full rebuild this time around. This was basically a valve body swap and looking at the direct drum to see if the mods needed for the t-brake were done or not. The .063" bleed hole was already there, so I just installed the 16 heavy return springs and checked the clutch pack clearances. I also replaced the direct drum seals since I took the piston out.

Clutches and steels looked pretty darn good for 250+ passes, so for now it's going back together as is.

Over the winter I'll do a more in depth freshening, but for now I just wanted to get my feet wet so to speak.

Only parts thrown away were some seals, old softer return springs and the previous ATI reverse manual valve body. No other parts were removed/deleted as the ATI rev/man was setup identical to the Griner brake in terms of no case mods, intermediate band/servo deleted and rear servo accumulator seals deleted.
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post #9 of 30 (permalink) Old May 28th, 08, 10:28 PM Thread Starter
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Re: th400 transbrake install

Quote:
Originally Posted by trmnatr View Post
Get the wheelie bars on order

Whats that transbrake run now, about $650 ?
From ATI it's $749

I found it online for $595 + shipping, so total was $620.

When I spoke with Steve Griner a few years ago, this brake was $550 direct from him.

Car has had wheelie bars on since last fall. Looks like I may never be able to take them off.
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post #10 of 30 (permalink) Old May 28th, 08, 10:32 PM
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Re: th400 transbrake install

Quote:
Originally Posted by 10secBu View Post
From ATI it's $749

I found it online for $595 + shipping, so total was $620.

When I spoke with Steve Griner a few years ago, this brake was $550 direct from him.

Car has had wheelie bars on since last fall. Looks like I may never be able to take them off.
I think ATI is higher for us local guys

Did you run or replace the steel sealing rings with Teflon sealing rings ?
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post #11 of 30 (permalink) Old May 28th, 08, 10:33 PM Thread Starter
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Re: th400 transbrake install

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Originally Posted by trmnatr View Post
I think ATI is higher for us local guys

Did you run or replace the steel sealing rings with Teflon sealing rings ?
trans already had teflon rings. I got a seal gasket kit from ATI to have here while I was working on it and they give stinking steel rings with their kits.
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post #12 of 30 (permalink) Old May 28th, 08, 10:40 PM
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Re: th400 transbrake install

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Originally Posted by 10secBu View Post
trans already had teflon rings. I got a seal gasket kit from ATI to have here while I was working on it and they give stinking steel rings with their kits.
Steel rings will allow the groove to blow apart in a failure, teflon rings will not

ATI is ATI and will always be ATI
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post #13 of 30 (permalink) Old May 29th, 08, 4:23 AM
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Re: th400 transbrake install

hmmm....and here I was thinking that all trans brakes used an external solenoid. .....so here I am once again learning from Team Chevelle. Thanks Todd for sharing.

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post #14 of 30 (permalink) Old May 29th, 08, 7:17 AM
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Re: th400 transbrake install

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Originally Posted by BillyGman View Post
hmmm....and here I was thinking that all trans brakes used an external solenoid. .....so here I am once again learning from Team Chevelle. Thanks Todd for sharing.
Nope, and some are actually a brake on the rear of the trans. Kind of like the parking brakes on some big trucks.


Looks good Todd!

I built myself a fixture for holding the trans, it is similiar to the Kentmoore piece a big "C" that goes into the case lugs, then I can hang it on my engine stand. If your gonna be tearing into this thing here and there it's worth buying or building one.

Here's a link to one on ebay.......I just built mine. Cheaper

http://cgi.ebay.com/ebaymotors/_Auto...m270240957236&

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post #15 of 30 (permalink) Old May 29th, 08, 7:18 AM
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Re: th400 transbrake install

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Originally Posted by BillyGman View Post
hmmm....and here I was thinking that all trans brakes used an external solenoid. .....so here I am once again learning from Team Chevelle. Thanks Todd for sharing.
Nope some companies have internal t-400 brakes. I had one in my old trans, but the Trans Specialties one has an external. I like the external because it's easier to know if it's working, I can hear it clicking from inside the car.

Ray

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