My '02 F150 Supercrew 4x4 has a vibration that only happens when I take off from a complete stop. It only lasts about 1 second and only starts happening about 3 seconds after I start to accelerate. It will also do it if I am turning a corner from a stop sign, again only for a second and this only happens at slow speeds and then goes away. It feels like it is coming from the rear half of the truck but not sure where. I check and replaced both u-joints on the rear driveshaft, checked the fluid in the rear axle, and checked the lugnuts to make sure they are tight. The only thing I can think of is possibly the rear axle bearings, but when I jacked the truck up I pulled on the tires and didn't have any play at all in them (not sure if they means anything.) Anyone have any ideas?

 

what kind of tires and how old are they?

 

Tires are BFG Radial All-Terrain T/A's (stock size- 265/75R17 I think,) they have about 40,000 miles on them but still have about 25% tread left. I bought them new about 2 1/2 years ago. I rotate them at every oil change.

 

If you have a limited slip differential, change the fluid. It requires 75W140 full synthetic and a bottle of friction modifier.

 

I changed the fluid about a year ago, and used the Ford fluid and friction modifier, I don't put too many miles on, maybe 12,000 since then. I will check it again though.

 

Hmm - that should be okay then. It should be good for 100k.

 

my 06 has started the same vibration,havent gone to dealer yet