On stock 16"s with 4.10's you should top at 5700rpm@40mph, 60mph, 85mph, 106mph, 143mph and 212mph (given enough horsies under the hood (1st-6th)
And I actually expect an increase on the highway, right now I still cant even use 6th gear, i stay in 5th, its boggy as hell around 70 in 6th, its too slow and if you go faster then 70 around here your askin for a ticket... 4.10's will allow me to cruise in 6th probably at a lower rpm then 5th, and still higher then old 6th which wont put as much stress on the tranny and rear... in theory atleast
but i drive on the highway maybe...1ce a month?
i'll keep ya up to date, and post some numbers. i kept a record of two runs on stock gears 0-60, and i'll do the same with 4.10's see how the rpm/speed/time changed.