2009 Ford F-150 STX 4dr SuperCab 4WD Flareside 6.5 ft. SB (4.6L 8cyl 4A)
09 stx shifts with a thump in cruise control above 65 mph. Took iy to the dealer twice, the 1st time they said there is no problem with and it was designed that way. Took it back the 2nd time they said there had been an upgrade with the transmission and they said they performed the upgrade but it still thumps when it shifts in cruise control above 65 mph. Does anybody experiences a similar problem and was it resolved?
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