[HR9121]

I can't say I'm a expert on this but I did run a C-4 my first year and struggled a little bit with consistency. I tried my set up several different ways and could never get it where I was satisfied and switched to a powerglide. I will say the best results I got with the 3 speed were 1-2 shift on the stop and 2-3 shift down track both on time. Good luck hope this helps a little.