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Pontiac Forum: Turbo 400 Transmission
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Old September 5th, 2018, 12:13 PM
Rickster Rickster is offline
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Turbo 400 Transmission

Recently bought a '69 Le Mans with a 350 engine and a turbo 400 trans. I am unfamiliar with the turbo 400 transmission. I've heard it said it is a good trans. What is it's qualities that make it better?
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Old September 5th, 2018, 01:27 PM
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How did you determine it is a Turbo 400, the 69 LeMans with a 350 came with a Turbo 350.
1971 GTO 455 HO Ram Air
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Old September 6th, 2018, 08:25 AM
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If both a T350 & T400 are stock, the 400 will stand up to more torque, and they can be tuned to shift smoother. They were even used as the stock Transmission in Rolls Royce cars for over 10 years.
On the down side they are heavier than a T350, and they take more HP to rotate so they sap a bit more HP from your engine, not much but alittle. I agree that the stock transmission in your car would have been a T350 from the factory if it came with a 350 2bbl. I am not sure what trans came in 350 4bbl equipped 69 Lemans.
2009 G8 GT
2006 Mallet LS2 Solstice
1978 Catalina Safari Buick 350 TH350 soon to have a Pontiac 400 4bbl installed!
1978 Sunbird Safari Buick 3.8 2004R
1977 Astre Formula 215 Buick V8 T-5
1973 Lemans Safari 400 4-speed (factory)
1971 Catalina Freeway Enforcer 455 TH400
1969 Firebird Sprint 301 OHC-6 T-5
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