Originally Posted by Dangerranger01
IDK but my passenger seat vibrates like crazy at highway speeds most of the time. Its really annoying and the i know the seat bolts are tight. I don't get it.
HAHA Mine does this exact same thing too! I'm hoping new tires, alignment and balance does the trick. It's like a massage for the passanger, the center console shimmies and shakes too. It's done this since 40k miles.
As for the driveshaft question... To see if your Universal joints are bad drop the rear driveshaft, this is where I found mine were bad. It is a pain to take it off. You will need a 12MM wrench and a pipe to put ont he end of it, or a 12pt. 12MM socket to turn those mounting bolts. Be sure to index the drive shaft location on the pinion flange and the front flange before removing the driveshaft.
I believe ford like everything else loctited the **** out of these bolts so do not be afraid to add PB blaster, Liquid wrench etc, It is a tapered thead, and they rust well.
Don't be afrain to MAPP gas the bolts a bit either.
When the drive shaft is out, turn the universal joints around... If they feel sticky, gritty or hanging they are shot. Now that you have the drive shaft out, just REPLACE them anyways. They are cheap, I picked up two at NAPA with grease fittings for... I think 13 a piece?
Half the battle is gettign the driveshaft off.
I don't think the front drive shaft universals wear as fast, becuase the rear ones are at a angle and more exposed... maybe i'm wrong though. Sounds just like the problem I had, and it was the universals.
Have you ever changed a universal before? if not dont be afraid to ask questions.