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Ok, I looked under my FX4 today and noticed that there is a U joint at the end of the rear drive shaft just behind the center support as well as at the differential. The drive shaft in front of the center support only has one u joint and it is at the rear of the tranny.
Perhaps you need to remove the front shaft and have a second U joint installed on it just in front of the center support.
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'03 Excursion, 7.3L, 4X4, Auto tranny of course (they all did), 4" MBRP exhaust, TS performance chip, K&N FIPK w/ an Amsoil EA filter, Hellwig anti-sway bar, drilled/slotted front & rear rotors. Rancho XL shocks, Rancho steering damper, Airlift 5000, S&S Diversified headlight mod. This baby surprises a lot of, so called, performance cars. 
'04 F 350, extended cab, 6.0L, FX4, manual tranny, 4" MBRP exhaust, Bully Dog Triple Dog downloader w/ Outlook moniter (Very disappointed in the Bully Dog), 2m-70cm Yaesu ft-8500, S&S Diversified headlight mod. 
'96 Mustang Cobra convertible, B&M short throw shifter, Koni adjustable shocks, viper chip, drilled/slotted rotors front and rear, rear sequential turn signals. 
'11 Harley-Davidson Road King Classic 103 ci PowerPak w/ anti lock brakes & Smart Security system. It even has cruise control!!! Candy Dark Root Beer over Candy Light Root Beer  Yaesu FTM-10R & a Comet CSB 790A
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