Not sure. I know with the 3.73 I am hitting 6k in 3rd about 20-30 yards before finish line. No time to hit 4th to make a diff. I'm hitting 100mph in 3rd at 6000. My limited has been raised to 6800 since cam install
No not a dd but its my only vehicle.I drive company truck every day. I don't want to lose all my top end. But I only have like two choices for a Toyota 8.4" rear. 4.10s or 4.56. Id like some 4.30s but can't find any.
You won't lose any top end really. Even with a 4.56 6th gear would be good for over 200mph, assuming you had enough power to hit that mark.
When setting up gearing, you want to look at your trap speed. You want to try and make it so that as you are crossing the finish line you are just passing peak power in your 1:1 gear. So, if power is starting to fall off at 6500 (just for example), you would want to set gearing so that you are crossing the line at ~6600 in 4th gear. That will be the absolute best setup for track use.