I have the March *Power and Amp* pulleys on my 91 5.0 AOD, and so far have had no problems with them. The only thing I noticed after putting them on was that my car started to run a little hot in 95*+ weather. But thats nothing a 180* thermostat can't fix! As for the hp increase, my car seemed to run a bit smoother, and I could feel it pull harder past 4000rpms. one thing I wouldn't recommend doing is running an electric fan with underdrive pulleys if you still have the stock alternator. You usually need a 130amp alt. when running both.
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1991 Mustang GT Conv: 58,000 original miles, 2nd owner.
Engine: FMS 65mm tb/spacer, C&L 73mm maf, MAC cai.
Drivetrain: Built AOD w/ Edge 2800rpm lockup converter, hardened 3-4 inner shaft, Trans-Go shift kit, B&M supercooler, FMS 3.73 gears & aluminum d/s, rebuilt traction lock.
Exhaust: BBK unequal length shorty headers, BBK o/r h-pipe, Flowmaster 2 chamber mufflers.
Chassis/suspension/brakes: Kenny Brown supersubs.
The rest is stock.
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