SST A41Tremec 4spd. Automatic w/383 anybody ?

383FormulaS67 said
Thanks! I'm running 323 gears and need to find out how that fits with an overdrive transmission, thinking 355 may be a better fit, TBD??

You can use a calculator to figure out what your RPM will be at cruising speed. This one has the 30% overdrive calculated into it: Engine RPM Calculator | Spicer Parts