You can try unbolting the driveshaft from the yoke, rotate the driveshaft 1/4 turn and then bolt it back up. This is Ford's standard procedure for reducing driveshaft vibration....
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92LX - D.S.S. 331 Stroker – T/F Heads Stage I porting - 75mm MAF & TB – AFM Power Pipe - AFM Programmable Management System - Vortech S-Trim, 10 Rib Belt - Holley 50# Injectors - Vortech Maxflow Fuel System - MSD Billet Distributor & 6A Ignition Module - Meziere Electric Water Pump - Black Magic 15in Fan - Evans Propylene Glycol Coolant - Tremec TKO - Centerforce Clutch & Pressure Plate - Lakewood Scatter Shield - FRPP Aluminum Driveshaft - Eibach Drag Launch Coil Spring Set – Battle boxes - Strange axles & C-clip eliminators - Powertrax Locker, 3.73 Gears
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