Put the dana in it and leave that ratio in it, no matter waht size tires You can always run it in 4th or 3rd gear for hill climbing or curves insted of running the motor at a higher RPM in 5th all the time BTW, ALL OEM Hemi 4 speed cars only came with the Dana 60

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)