Ok, I converterted from a t-5 to an aod so I am very conscious of what these gearchanges mean . 3.73's and even 4.10s are way too mild on that aod. It'll be zippier but not quite......zippy enough....to go toe to toe with the sticks. You really really need the 4.30's if you want neck snapping acceleration. Gas milage wont be affected that much because of that ridiculous .67 od gear in the aods.
Second, get a transgo kit. Installation is easy but messy. It's like less than 100 bucks and will make your transmission shift like BAM BAM BAM and hold rpms to higher rpms. Well worth it and actually quite necessary if your trying to kick ass with an automatic.
Get a high stall torque converter. Nice like 2400 or 2800 stall. You'll need to move the battery to the trunk to restore traction <GRIN>
If so inclined.....get an engine lift, haul that entire 86 wierd flat topped piston engine out and toss it. Local yards will stock used 5.0 einges for $500. Do a swap! Just drop an easily modifyable engine in and be done with it. If the speed density bothers you or gives you crap, laugh maniacally and rip out all the fuel injection and drop a holley carb in. It'll take a week to set up but then your fuel system will never bother you again and you'll never have to mess with old wiring or failing sensors. It's much more reliable if not a little finicky when the weather changes sharply. Even then, you can restore perfect operation witha turn of the screw.
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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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