AFTER 2 YEARS AND MANY ATTEMPT'S TO FIX THE 65 MILE AN HOUR VIBRATION IT STILL EXIST.HAD THE TIRES BALANCED,NEW SHOCKS,NEW DRIVE SHAFT,BODY BOOM KIT (FORD TSB FOR THIS).AT EXACTLY 65 MILES AN HOUR IT VIBRATES,NOT SURE IF IT'S FRONT ARE BACK ARE IN THE MIDDLE.AT 60 IT DOESN'T DO IT OR 70 EITHER RIGHT AT 65,I MEAN RIGHT AT 65.THIS IS A 98 SUPERCAB F150 5.4 LITER LARIAT.3:55 GEARS STOCK ORIGNAL FACTORY TIRES.24,500 MILES TOTAL STOCK TRUCK.ANYBODY FOUND THE FIX YET,THANKS KJ.

 

K. Jones,
Sorry to hear of your problem, I know it can be frustrating. Have you tried to isolate the exhaust system? I have read others posts on this board about exhaust vibrations. Try doing a search on this topic, it may help.

Hobbit

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99 XLT,4.6L Auto,4X4,tow pkge,Factory Side Steps and Mudflaps, K&N filter,BugflectorII, Amazon Green/Silver, Pace Edwards Rolltop Cover, still want a Superchip and by golly I'm gonna get one (just as soon and I hit the lottery )

 

I too have/had this vibration problem and I isolated it to the exhaust system by tieing the pipe behind the muffler to the frame and it went away.
Ford sends a weight that bolts on to the exhuast and one has to move it around to get the vibration to go away. My 2001 had one weight already on it just in front of the muffler. Ford sent another. After the dealer messed with it for an afternoon the vibration was still there but not as bad. I then took it home and put the truck on stands and ran it and moved both weights and finally got it to remove 90% of the vibration by moving both weights. My vibration was right at 55 at its worst. I don't feel it in the steering any more and is very slight and is hardly noticable now. It took some time and several different positions of moving both weights but it is much better now.

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ecm747x

2001 SUPER CREW XLT, BRIGHT RED
5.4L Triton, automatic 3.55 gears limited slip
tow package
16" tires
side steps
bed extender
ford/duraliner bed liner
60/40 seats
6cd changer
moonroof
sliding rear window

Soon to come Mods...

Adding. Installing different exhaust, not sure which yet. Front grill guard. With light kit


MODS....
1) Lund x-terminator bug shield
2) Super Chip>>>>Well Worth the Money
3) Airforce One F.I.P.K.

 

THANKS FOR YOUR IMPUT,I DIDN'T WANT TO CHANGE EXHAUST TILL THIS WAS CLEAR UP.I WILL TRY TO TIE IT UP TO SEE WHAT HAPPEN'S.IF IT HELP'S THE EXHAUST IS GONE,I'LL KEEP YOU POSTED.THANKS AGAIN (HOBBIT&ECM747X)MERRY CHRISTMAS KJ