just wondering if someone could tell me.. and also how much is my speedo off now? i have done all the mods i can think of so what should i do now? any help would be great.. check out my sig..

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1988 firebird ws6 formula350tpi ascd ram air hood GT AUTO factory fiberglass wing black paint with blue pearl centerline champ 500 16x8 all around potenza 245 50 16 on front and 27x11.5 16 mickey thompson sportsman pros on the rear(real sticky!!) msd 6al box blaster 3 coil accel 8.8 race wires hooker shorty headers hooker cat back system pro shift light A pillar gauge pod and water temp and air/fuel ratio gauges autometer oil pressure gauge b&m mega console shifter vette servo custom ram air system with a 9" K&N cone filter tb coolant bypass slp runners polished plenum and runners 170* thermostat smog pump and a/c delete plus cat delete march underdrive pullies, tpis airfoil cvr high torque starter (love it) aluminum drive shaft best 1/4 mile run of 13.77 @ 102.07 with a 1.9 60' THE FORMULA IS FOR SALE SO ANYONE INTERESTED IN PICS OR PRICE EMAIL ME.. HAVE TO SELL IT GOING TO BUY A HOUSE.. IT SUCKS BUT HEY GOTTA DO WHAT YA GOTTA DO
also 1997 grand prix gtp black with custom cold air indcution... its the girl friends and i havent got to run it at the track yet but i will!!! yes i will... well as soon as she lets me lol.. but it seems pretty quick for a 6 and front wheel drive

 

Well as long as you keep the Mickeys on there it will make you faster. How much faster depends on how hard you can launch it. I mean if you brakes can hold the car to a 3000rpm launch you will fly out of the hole and that 3.73 will be a god send and may yeild you a .3sec improvement in ET. A lot of people hurt themsleves using this gear thinking it will make them faster and can hook with it.
Its all in coming out of the hole, then yes it will help motivate your car down the strip.
With your mods it looks like the 3.73 will be friendly to your power band and should really make the car happy. Espically with your high stall converter

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89 Trans Am Turbo 3.8L All stock 43,000 miles #1053 of 1555

Past Thirdgen:
86 Trans Am w/ built 355TPI with SLP goodies and too much other stuff to List. One sweet *** car, wish I would have had a good enough Job to pay insurance on three cars so I could keep it, but for a 89 Turbo Trans Am w/ Low miles, I think I made the right choice!