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Some comments on 4 speed vs 5 speed vs 6 speed:

4 speed: Best as a single purpose transmission. It can be set up for drag (high numerical gear), street (medium numerical gear) or road race (low numerical gear)

5 Speed: Decent multi-purpose transmission. Drag with 1'st 4 gears or road with 5'th. The compromise is in 5'th with a stout engine. Is 5'th set up as an ideal 75 MPH cruise gear? If so it is probably too tall for max top speed. Or is it set up for top speed and too short for ideal cruise?

6 Speed: 1-4 can handle drag, 5'th for top speed and 6'th for ideal cruise. The ideal manual transmission? The main drawback is size and tunnel/mount mods.



The 5-sp's 5th gear isn't as numerically low as the 6sp's 6th gear. The 6sp T56's usually have a 6th gear in the .50-.57 range where the best you can get with a tremec 5sp is a .64. Doesn't sound like much, but at these ratios, a few points makes a big difference if you really want to gear it to the max.