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Yes the 425 used the same crank as the 400 in 65-67. Olds in 1965 and 1966 did option a 4spd trans in some models with the 425. Dont forget too that the 3spd standard trans was standard in a lot of the full size models up till 1971 or so but very few were built. The turbo 400 was used in 99.9 percent of the B-body cars.....Mondello sells a bushing that goes into the back of the auto trans cranks for the stick conversion. The only thing required is to measure to see if the tip of the input shaft will hit the center of the crank. If it does you need to drill the crank deeper or grind a little off the trans (not recommended) and although the crank is hard it can be drilled with a drill going up gradually in bit size while the crank is in the engine. Remember exact centering is not critical as the Mondello bushing aligns the input shaft, you are drilling the crank for clearance only.
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