No, it's the stock driveshaft. They cant handle gearswaps and end up vibrating because the driveshaft now has to spin 3.73/2.73 = 36% percent faster at the same speeds. You could produce the same DS vibration by driving a stock 2.73 equipped mustang 75/.64 = 116 mph! Even then, the vibration damper thingy hanging off the pumpkin will probably help.
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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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