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 Transmission / Driveline and Traction
 Turbo 400
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68bird
Sitting Bull

USA
221 Posts

Posted - 22 Apr 2015 :  7:00:05 PM  Show Profile  Reply with Quote
hello all. What is the best rebuild kit for a turbo 400 transmission? I see many nice looking kits through vendors such as summit. I'm looking to do s general rebuild and add a shift kit at home. Thanks.

Robb Hermes

68bird
Sitting Bull

USA
221 Posts

Posted - 24 Apr 2015 :  06:41:56 AM  Show Profile  Reply with Quote
Come on fellas..... Any input would be appreciated.

Robb Hermes
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73TA455
Buffalo

USA
77 Posts

Posted - 24 Apr 2015 :  09:19:06 AM  Show Profile  Reply with Quote
I've used this one a couple of times. Worked nicely, included good instructions.
http://www.summitracing.com/parts/bmm-20229

http://www.bmracing.com/products/20229-transkit-automatic-transmission-shift-improver-kit-for-th400-th375-and-m40-1965-to-1987-gm/?mk=&yr=&md=&smd=&eng=

RL Edwards
1973 Trans Am
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Blued and Painted
Chief PONTIAC

USA
3404 Posts

Posted - 24 Apr 2015 :  09:59:29 AM  Show Profile  Reply with Quote
Even with 30 years auto experience and a huge selections of tools, I let a TRANS GUY build mine. I got lucky and found a guy in Castle Rock who drag races pontiacs and builds transmissions every day. He also has the Continental converter builder on speed dial.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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Steve C.
Crazy Horse

1672 Posts

Posted - 24 Apr 2015 :  10:15:49 AM  Show Profile  Reply with Quote
Enthusiasts have embraced the GM Turbo 400 automatics for years, and the popularity of these transmissions is not slowing down. Cliff Ruggles walks through the step-by-step rebuild and performance upgrade procedures in a series of full-color photos.

http://www.amazon.com/Rebuild-Modify-Transmissions-Design-Workbench/dp/1934709204
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68bird
Sitting Bull

USA
221 Posts

Posted - 24 Apr 2015 :  12:18:26 PM  Show Profile  Reply with Quote
I've never rebuilt one before, but I've heard it's not to bad if you take your time and stay organized. Any other books I should consider before diving in? I'm replacing the TH 350 that was in the bird. I just feel it will be smarter in the long run due to the torque the 461 will throw at it.

Robb Hermes
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67drake
Sitting Duck

Azerbaijan
1501 Posts

Posted - 25 Apr 2015 :  2:05:36 PM  Show Profile  Reply with Quote
I like the challenge of doing things that people tall me I can't or shouldn't try to do myself,but that's just me. SOMETIMES it's for cost savings,but most of the time for satisfaction.


71' GTO Original 400 M20 3.23 posi
13.95@102.1 MPH on street tires
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KyHeadhunter
Sitting Bull

157 Posts

Posted - 12 May 2015 :  12:07:03 PM  Show Profile  Reply with Quote
quote:
Originally posted by pitts64

Makes more sense to me to work a few extra hours at what I do to pay for it...



X2. Transmissions are not that hard to take out and put back in, but I like knowing its going to be right the first time.

78 WS4, L78, M33
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RayK
Cochise

USA
925 Posts

Posted - 30 Aug 2015 :  08:53:07 AM  Show Profile  Reply with Quote
Transtar is a pretty good supplier. Get a book and read BEFORE getting inside a transmission if you've never done it before. Just keep in mind that rebuilding a transmission without changing the bushings is like rebuilding an engine without replacing the bearings. It's a half assed rebuild without.

1969 Firebird 461, #62 iron heads, Comp roller, Performer RPM, Q-Jet Turbo 400 w/ Continental converter. GM 8.5" 10 bolt with 3:73 gears.11.50's@ 119+ MPH
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68bird
Sitting Bull

USA
221 Posts

Posted - 22 Jun 2016 :  7:52:16 PM  Show Profile  Reply with Quote
Just thought I'd come back and visit this old post. I was tipped off to a tranny guy not far from me that does it for a living. Stopped by his shop before hand, and it was almost like walking in in 1976. Some beautiful cars on the lifts, some customers' and a couple his, one of his being a 64 goat. We hit it off right away and the next day I dropped the th400 off. I'm happy I did now as I didn't know the history etc of this short shaft I picked up for free. He seemed elated that a younger guy came walking in asking about building a th400 in replace of his 350. Probably could do one in his sleep, not like the modern commuters on the road today.....

Robb Hermes
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