Mechanics

FLOOR BOUNCES UNDER DRIVERS SEAT/ NOT SEVERE , BUT LIKE AN OUT OF ROUND TIRE

1999 Ford F-150 • 70,000 miles

4x4 auto trans. At about 42 -47 m.P.H. The floor bounces in 2wd mode /not noticed in 4wd mode = started at around 60,000 miles. We have replaced tires and wheels / u joints / rear end lube with synthetic grease / lubed the drive shaft slip yoke with Ford lube / multiple tire balances / a couple of alignments / putting several hundred pounds in bed. Only acts up at 42-47 mph whether under load or coasting = up or down hill = in drive or neutral. Ford techs say they "have run out of ideas " and there are no service bulletins for the 4wd
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Ron moncol
November 29, 2011.




There are no TSB on this. Did they check the wheels and u-joints?



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