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When i first pull out in my 1999 f150 with 5.4 engine it has a brief vibration that feels like it is coming from the rear end of the truck, I have checed the brakes and they appear okay. It only lasts for a couple seconds then goes away. Any suggestion are appreciated.

if u have a limit slip diff ( both wheels pull ) then poss the clutches in the diff r slipping  try service the diff & make sure that u add the limit slip additive to the diff       if u dont have a limit slip diff then poss the mounts   does the vibration goes away when u put the trans in low gear see if the vibration is still there

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transman