Electric fan may have problms
 

I've just ordered an electric fan. And then read that with pullys and a 75 amp alternater it won't work right. Any ideas.

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3:55s w/posi,Cold Air Induction,Mac headers,Hedderman Off-road H-pipe, MSD Ing.&wires, 65mm T.B. Hurst Short Throw Shifter,front sway bar removed,2 chamber flows,pullys, and Griffen 3 core radiator.. Not to fast Not to Slow, Working on the fast part.

I dont know why it would make a difference. I had pulleys and a stock alternator with my electric fan and it ran perfect it just wasnt enough to keep the stang cool.

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347 Stroker Motor: Balanced, A9P Computer, Cobra Transmission, Extrude Ported and Polished Upper and ported Lower, GT40 Milled Ported and Polished Heads, B303 Cam, BBK 1 5/8 Headers, 30lb Bosch Injectors, Holley Fuel Regulator, March Underdrive Pulleys, Perma-Cool Fan, 3-Core Radiator, Accel Performance Coil, Accel 300+ Racing Wires, Ram Air, K&N Filter, 79mm Mass Air Unit, FlowMaster Exhaust w/BBK Offroad H-Pipe, Hurst Short Throw Shifter, 3:55 Gears, Ram Clutch, Cross Drilled Rotors

A 3G alternator could be just the ticket..
I did it, and have no worries with my pullies, fan, and stereo all on.