I've got the stock 2.73s and all I can say is that it accelerates nicely. I hit (without meaning to) 100 getting on the highway one day, trying to pass a line of cars. I then realized I was only in 4th gear. She was still pulling hard and if I had shifted and punched it, I'm sure it would have kept going. 3.73s will limit the top end just because the engine will rev higher at any speed BUT, won't be anywhere near 80. In fact, you won't get to that point. On the other side, if I'm doing 80 in 6th, I have NO real acceleration power at all. OP, what gear are you in when you top at 80?