It depends...
Sure more gear is better, but how much is too much. I would try 3.73's , and thats what I have in my S-trim opentrack Mustang.
4.10's would seem a bit too steep, and 3.55's seem like not enough.
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Darius Rudis
Roadracer: Home built t-arm/panhard suspension powered by an S-trimmed motor :-)
My Mustang Page