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is there an rpm spread that is ideal?
Probally but every motor and converter may not be the same, my T/A 8 inch drops down to 5700 RPM if I shift it at 6000 up to 7000 RPM, if I shift it above 7000 RPM if will drop down to 5800, to 6000 RPM depending on from first or second. I run the Mopar brand 2.77 low 1st gear set so the RPM drop is more than with a stock standard 2.45 low gear set  I have always operated on the theory that you have to go to the tarck and find out where to shift each combination by testing it  IHTHs
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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