I was up on the hill behind my house 4-wheelin', so when I came out on the paved road I decided to clean my tires off, so I punched it to the floor. The truck hooked up and LAUNCHED!!! By the way... I was in 4 low!I never thought this truck could pull that hard! But anyway, I now have a vibration at exactly 45mph. Cannot determine the origin, it's just kind of a growl and vibe. It will only do it at 45 though. Any ideas? I'm thinking u-joint, stuck front hub, driveshaft twisted....just don't know where to start looking. The truck is a 1999 F150 4X4 ext-cab, 5.4l auto, 265-75-16 rubber. Where's the weak link?

Thanks,
Bill



[This message has been edited by WPoling (edited 03-23-2001).]

 

Have you washed it since you gone 4-wheeling, might have mud caked on the inside of the wheels. The mud could of have made the wheels out of balance.

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2000 F-150 Xlt Ext.cab
Red 5.4 4x4 Auto

Waldoch Conversion
4in Trail Master lift
Rancho RS5000 shocks
35in BFG MT
Amrican Eagle 589's
Custom Fiberclass hood
Better Bilt tool box
Just ordered custom front
bumper with winch mount.

 

Darren
You could be precisely right! I had the same thing happen to me this past winter... I would get up to around 40MPH and something would start shaking in the front end. Turned out to be an ice block that formed on the inside of the wheel. Scared the crap out of me though!

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2000 Extended Cab F-150
4X4 Offroad
Flairside Oxford White
AirRaid FIPK
2001 L Tails
2001 L 3rd Brake Light
2001 L Corners
Pioneer DEH8000, 12 Disc Changer, Custom Amp Rack, Rockford Fosgate Punch 160, Rockford Fosgate 10" SUB. Keyless entry on Drivers door. Brushguard, 2 160 Watt K.C.'s, Duraliner Bed Liner.

 

Nope, no mud. That was the first thing I checked. Then tire pressure, that was ok, too. Haven't had time to get underneath and check anything out there. Ant other ideas on what to look for would be appreciated.

Bill

 

may have broken the hub assy in your auto locks jack up the front end and run it and see if they make noises

 

I have MANY issues with vibration. My latest is a 25-30mph that occurs under acceleration. Ford tech how does the problem you describe in your previous post present itself and what is the fix? Thanks