Turbo 400 Transmission

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jplace
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Joined: Wed Oct 20, 2010 4:39 am

Turbo 400 Transmission

#1 Post by jplace » Tue Oct 23, 2012 10:05 pm

I am rebuilding a Turbo 400 transmission. I wanted to know what upgrades I should make to the transmission.
This is going in a race only car no street use with about a 700 hp engine. :scratch:

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wikd69
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Location: Rocklin, CA
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Re: Turbo 400 Transmission

#2 Post by wikd69 » Tue Oct 23, 2012 10:22 pm

jplace wrote:I am rebuilding a Turbo 400 transmission. I wanted to know what upgrades I should make to the transmission.
This is going in a race only car no street use with about a 700 hp engine. :scratch:
Case Saver - keeps the shock rebound from shocking and taking the lugs out of the case. This one is billet aluminum from Coan and is pretty spendy (aound $90). You can buy something as good for as low as $20 elsewhere.

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1969 ProStreet Camaro RS Best 9.75@139 1.46 60'
Blown 427 BBC, TH400 w/Brake, Back-Half Ladderbar
Narrowed 12-Bolt, 4.10 Gears, Spool, Moser 33 Spline

http://www.marsh-racing.com/harrys_camaro-1.htm

jplace
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Joined: Wed Oct 20, 2010 4:39 am

Re: Turbo 400 Transmission

#3 Post by jplace » Wed Oct 24, 2012 8:28 am

I read about replacing the intermediate roller clutch bearing with a 34 element sprag. I think there is a direct drum roller clutch bearing. Should that be replaced as well with an upgraded sprag ? :scratch:

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wikd69
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Re: Turbo 400 Transmission

#4 Post by wikd69 » Wed Oct 24, 2012 1:33 pm

jplace wrote:I read about replacing the intermediate roller clutch bearing with a 34 element sprag. I think there is a direct drum roller clutch bearing. Should that be replaced as well with an upgraded sprag ? :scratch:
Unfortunately, you're way past what I know about internals on these things. I'm betting though that there are others here on the Forum who can answer that question.
1969 ProStreet Camaro RS Best 9.75@139 1.46 60'
Blown 427 BBC, TH400 w/Brake, Back-Half Ladderbar
Narrowed 12-Bolt, 4.10 Gears, Spool, Moser 33 Spline

http://www.marsh-racing.com/harrys_camaro-1.htm

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wheels
Posts: 40
Joined: Tue Nov 23, 2010 1:15 pm

Re: Turbo 400 Transmission

#5 Post by wheels » Thu Nov 08, 2012 12:05 pm

34 element sprag is a must, you can swap the flat bushings at the tailshaft for torrington roller bearings. Have a good shop re-work the pump, there is a trans brake mod (don't remember specifics) that can be done even if you don't have a brake helps increase line pressure. Good (red) clutches and steels, and use teflon sealing rings. There are direct drums that can hold 6 clutch packs instead of 5. I have never tried that the stock drum works fine for me. A manual valve body comes with its own mods as well. These are very easy to do most of the work yourself, just need a press to get the drums apart.

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