Ok, I went from a 3.08 geared 5 spd to a 3.73 geared 5 spd then added a carb and then went automatic. The milage is 21-22 but I have been able to coax 24-25 if I'm highway cruising and watching the vacuum guage half the time.
3.55's are nice and cute but you wont dominate all until you go to at least 4.11's for an AOD. I thought the 3.73's were way too mild and went 4.56's. They're the perfect gear (well, maybe 4.30's are the perfect gear) and put me at 3k rpms at 80 and I can bark tires on dry cold pavement.
A shift kit is an absolute must. I've played with transgo kits and theyre crap. You should get an "a" servo for $150 to improve trans life with those higher gears and a lentech strip terminator valve body. That will give you constant line pressure and torque multiplication in 3rd gear as well.
Have fun!
Pete
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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