How tall are your tires? I think 4.10's are steep and I have an AOD with stock wheels. I kinda like the 3.90 idea myself but it's all up to you. I'm doing 2500 rpms in OD going 65. There was a HUGE difference between the 2.73's that were in there and now 4.10's but I do love em. I will go to a taller tire later on. I did have a 5 spd with 4.10's a few years ago(bought it like that) and from what I can remember there wasn't much in the area of top end but then again it was stock wheels and tire size. You sure had to shift it fast, that I won't forget.LOL
Good luck, James