Floor bounces under drivers SEAT/ not severe, but like an out of round tire

Tiny
RON MONCOL
  • 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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Tuesday, November 29th, 2011 AT 1:48 AM

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Tiny
JACOBANDNICKOLAS
  • EXPERT
  • 68,399 POSTS

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

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Tuesday, November 29th, 2011 AT 2:11 AM

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