Friend, dont waste your time going to 3.73's, you wont see enough difference to warrant the change. Go 4.10's or 4.30's. I'm going 4.56 on an AOD myself and this is a street car driven on the highway. You have a .67 OD, use it to your advantage!
Buy a rebuild kit from transstar ($70) and an AOD-HP kit from transgo ($100) and some kevlar bands ($25 each).
If you have a budget, a 3000 stall tci street fighter lockup ($300), a hardened lockup shaft ($160, a must for 500 HP) and an A or A+ servo (another $150) since you'll spend so much time in OD with those higher gears.
You will be surprised (well, once you wrestle it out of the car) how easy it is to do an AOD rebuild. It's just a bunch of stuff stacked up and held together with a few snaprings. Once you get your snapring technique down, you can rebuild an aod in your basement in 2 afternoons plus the horror of dropping and replacing a 200 lb transmission (......1 ton floor jack with big piece of wood under pan and 2 scissors jacks on the sides hooked into the pan lip to keep it from tipping sideways. Takes about an hour to lower and an hour to raise. Slides around real easy on the pan.).
I had never even seen or driven an AOD before I got a junkyard piece for about $100 and went ahead with a rebuild. Just take lots of pictures during disassembly! It gave me a real appreciation for the technical marvel that is an automatic transmission!
Have fun!
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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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