I drive a 2004 F150XLT, 4wd, auto trans, electronic 4wd.

Sometimes on a hot day, after the truck has been parked for hours, I'll be driving along, 30-40 miles an hr, and the truck will start shaking, like a front end vibration. I've checked the lugnuts, the tires are balanced, letting off the gas doesn't change the vibration, slipping the trans into neutral doesn't stop it either.

When I apply the brake, the shaking is more pronounced, and when I release, it returns to the previous level of shaking.

I pull over and stop, and when I take off again, the problem has cleared.

The last time it happened, I switched to 4wd. It took a couple of minutes before I could get it back to 2wd.

I suspect a faulty 4wd solenoid or similar problem.

The dealer (Lakewood Ford, Lakewood CO) can't find any problem. You know the drill- when the mechanic test drives the truck, it drives just fine.

Does anyone have any ideas? Anyone heard of this problem before?

All replies are welcome.
Thanks,
Barry

 

Have them check for a problem with the e-brake. It is a known issue, and yes it does cause vibration. In my case all that was required was to back off on the e-brake adjustment a little as it was very tight. Also there can be a problem with the front calipers where they seem to grab some without you using the brake. In both cases with my old truck, you could smell that the brakes where hot. There is a TSB for front caliper and rotor replacement if you have a vibration problem. As this is a TSB and not a recall, if you are out of warranty or extended warranty, you foot the bill.