Re: New owner of 1966 gmc
For 1966 inline sixes there were two 4 speed transmission choices, the GM SM-420 and the New Process NP-435GA. For automatics there was the 2 speed Pow-R-Flow(otherwise known as the Powerglide). If you're considering any of the 4 speed transmissions mentioned you will need to the taller transmission floor cover.
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