Gears
 

If I go with a set of 3:73's or 3:55's how much should i expect my rpm's to go up on the highway? My car is a daily driver 30, miles to work and at 70MPH I'm at 2100rpm now
It's also a auto with overdrive, how will that be effected?

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1999 GT AODE ,MAC cold air kit,ATS-III seq. turn signals

I have a 99 GT auto with 3.73 gears and my rpms at 70 are 2500 with 25.53" tires. I have can still hit 115-120 in 3rd gear with the 3.73s. It will make a slight difference in performance, but the gears with a converter will make a night and day difference. Set some money aside for a converter after the gears and you won't be sorry.

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EXAM1999
99 Silver GT
4R70W, Borla Cat-Back, 10.5 ProTorque custom converter, cooler & Transgo Shift kit, Synthetics, Bassani X-Pipe, V2 S-trim, 3.73 gears, FMS 70 mm T/body, FMS Shorty headers, Wolfe Racecraft Adj. upper & lower control arms & ROH ZR6 wheels(17X9.5 & 17X8.5 w/Nitto Extremes)
Dyno 2/25/00
Best:
316 rwhp
332 rwtq
Dyno 3/26/00 After fuel mod, FMS headers & Pro Torque Converter.
338 rwhp
342 rwtq