You gotta figure out what you NEED.
Depending on the track and horsepower and what trans gear you wanna run in...
I run a 3.73 gear with an S-trim motor. Does fine on local tracks between 3rd/4th. I had it at MIS and ran 5300rpm in 5th!
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Darius Rudis
Roadracer: Home built t-arm/panhard suspension powered by an S-trimmed motor :-)
My Mustang Page