Re: GMC Auto Column TH-400/Chevrolet TH-400 Column differences
I know the TH400 was officially first available in 1966 for Chevy trucks (3/4 tons only). However, I'm told some snuck out in late 65. GMC literature states that the TH400 was newly-available in 1966. Not sure if any snuck out of GMC early like happened with the Chevys. I've been looking for an example of a V6 GMC backed with a factory TH400 auto and have yet to see one.
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