I pin the needle at least twice weekly, but I have the 3.73 gears and have tried to do the math to figure out the top speed. The speedo is roughly .3 miles off for every mile, but 45 mph at 150 seems a little high, lol, so back to the drawing board. At any rate, before any mods, I have gone no faster than 140-142 before the engine said ok, that's enough. That was in 4th gear....ran out of road in 5th, but with stock gears, I don't think the top speed would be reached in OD anyway. I would venture to say that the top speed is somewhere around 145-150 mph. I'm getting the SpeedoCal from Dallas Mustangs, so hopefully I'll know soon.
1992: 86 IROC 305 AutoSled - 115...downhill, with a tail wind.
1993: 93 Pontiac Firebird Formula LT-1 6 Spd - 162...radar gun (thanks Bill the cop!)
1996: 93 Mustang GT 5 spd - 135 confirmed by Trooper (thanks for no ticket!)
1999: 89 Lincoln LSC 5 spd & 3.73s - 130 paced by bosses car (Cop car, calibrated speedo)
2001: 01 Mustang GT Convertible 5 spd - 140 (135 w/top down)
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