Ok, lemme qualify that...
With 3.55's (I assume), you wont be feeling much vibration.
I feel a decent vibration with my 3.73's and it's pretty bad around 80. You can feel it in the gas pedal and the wheel. The whole car is shaking.
Now with anything higher than 4.10's , you'll end up with enough vibration to damage something or at least be really annoying.
Plus, any excuse to lighten up the car and reduce rotational mass is a good excuse to me! 
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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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