Cool, but i ask, why in low range? It definately should drop your HP numbers (1 because it's not direct drive, 2 because it's an "easy" gear and doesn't put as much load on the motor)... your HP numbers should be higher in 4th gear hi range (not to mention the extra drag)
WHat are the peak hp / torque? ANd how about in 4th gear hi range?
(99mph sounds like you hit the speed limiter?)

89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim