With my 6-speed manual and 4.10's in the axles, seems 89-90 is all my '03 has before it's on the "governor". Been thinking of either dropping to 3.73's in the axles or throwing in a Gear Vendors Overdrive unit. Both are rather expensive though.

 

My 03 6spd with 3:73 and stock tires got the gps up to 111 and still had some left b4 I got outa it from lack of road.... Ah I mean track.....

 

i got 4 10 gears with auto tranny with some upgrades i can hit 90 pretty easy but she will hit 120 if i have enough road

 

yeah you need more fuel and a 3kGSK. Mine has 4:10's and only went 79mph floored stock with stock 245 rubber. Now it will do all of that at about 3/4 throttle and i still have my 4:10's