yes i have sbc 350 with tko600 5 speed .64 5th gear , i started out with a 3.70 but changed to 4.11 , could have gone to a 4.56 with no problem. it only raised my rpm about 200 changing from 3.70 to 4.11. when i had the 3.70 i was running about 2000 rpm in 5th at 70mph ,now im running about 2250 with the 4.11's. where is your powerband on the motor? mine starts at about 3000 rpm. my motor is a full roller 350 430hp. most of my friends still have their 4 speed and all i hear is them wanting to change to a 5 speed. good luck on your choice.
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