Comparing manual trans options - variables other than gear ratios?

It depends on how much you want to cut the floor.
If I was willing to cut the floor, I’d be looking for a Doug Nash 5 speed as my first choice. I’m not concerned with how many RPM the tach says going down the freeway so I don’t need an OD.

You can get a 3.25 first gear in the Nash, and even lower if you want it and 5th is direct. 5 gears are faster than 4. Always.

After that I’d do the Passon 5 speed. It’s a gear box. Whatever is causing issues should be quite easily fixed by someone half competent about gear boxes.


Then the 3.09 first gear 833. I use the 3.09 box right now. Someday, when I’m rich I will buy a Passon 5 speed. If it doesn’t work, all you need is a mill and a lathe.