Quote:
Originally Posted by Underdrive
Bearing in mind what others have said about the gear ratios of alternative 'boxes how about approaching it from a different angle. Look at creating a broader torque curve at the appropriate areas of the rev range, by changing and timing curves camshaft.
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I was thinking the same thing. It would probably be easier than a transmission retrofit.
Another option to consider is fitting the short shifter from the later 140 or 1800 if your pre 1972 140 still has the long shifter. With the shorter throw it will speed up shifts and reduce the vehicle speed drop during shifts which will keep the engine operating closer to its torque peak. Not a drop in fit; but, more drop in than trying to fit a true close ratio 5 speed (if you can find one).