I have a 2005 f150 stx. And when i get to about 50 mph it starts to get bumpy until 55 or 60. Not a big issue to me but it's just annoying. Anyone know why it's doing this? Cause of my tires?

 

"Bumpy" like whole truck bucking? I would check FPDM little module over spare tire. Also what's your mileage? have you changed COP's and plugs.

 

If it starts at 50 and goes away 10 or 15 mph later my money is on tires needing a balance.

 

Thats what i hope it is.

 

or an Alignment... are your tires wearing evenly ??

 

Imma take it by my cousins shop tomorrow and let him take a look

 

your Cousin the tire dude ??

 

If you rev it up, does the bucking go away? Whats your mileage??? If its the engine misfiring and causing you to buck a bit, it's probably time for plugs. You gotta answer all the questions above if you want a good answer from us. When plugs misfire, it's pretty common to buck at low RPM while on the highway.

I can't see the truck having a problem for only 5 MPH at highways speeds and it being unbalanced tires. I would think you would feel it all day long at speed...

 

It just gets bumpy when i get to 50 mph. Thats all. Doesn't do it when i rev up. It feels like im on a bumpy road.

 

around here yeah