Getting the most out of my 360

Just for grins, I ran some numbers.........Total speculation of course, a timed baseline would go a long way. :smile:

Looking at your combo, i used a 5500 shift point, 26" tire and trap speeds of 75 & 80mph.

The 1-2 shift drops to 3000 and the 2-3 drops to 3300 rpm's.

With the 3.23's, trap rpm's are.......
5200 @ 75mph
5600 @ 80mph.......both in 2nd gear.

With the 3.91's,.........
3800 @ 75mph
4100 @ 80mph.......both in 3rd gear.

The big advantage I see with the 3.91's is that it will help pull you up out of that 1-2 shift......although it may feel a little softer at the line in the bottom of 3rd gear?

Sticking with the basics you have right now, future engine mods should be looking toward maximizing mid range torque. Long tube headers will really help along with a aggressive timing curve.