Re: Changing from 3 speed to a 5 or 6 speed
I know this a little different than everyone else, but I used an "Aisin AR-5" 5 speed from a 2009 Colorado on my 1965 shortbed. I used a stock bell housing with a home built adapter plate and hydraulic clutch also the driveshaft had to be shortened. This lets me get 2100 RPM at 75MPH. It's a tight fit with the stock bench seat, but Core shifters makes a short throw shifter that uses Hurst shift levers of many different bends.
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