Well i have been fighting a vibration issue around 75 and slightly around 45, , just recently installed brand new driveshaft from ford with new everything, new tires, all fluid changed, the vibration is alot more noticeable with no fuel and bed empty, when I filled up this morning the vibration changed to not as agressive but still present any help would be great , going to disney with family tommorrow and dont want to bounce 800 miles, thanks

 

do you have a lift on your truck or is it stock height?

 

stock height 2wd, only mod 6637 everything else factory ford stuff, ext cab long bed truck with top on bed

 

I fought a vibration issue for over a year and turned out to be the tires. I had them balanced, road force balanced etc. and never got rid of the vibration. I ended up getting a new set of tires because the old ones had gotten worn and the vibration went away. The tire guys said a belt must have let go inside one of the tires?? Dunno but it fixed the problem.

 

i'm thinking maybe getting your tires rebalanced

 

Costa types faster...lol

 

it has been going on for some time now with 2 differnt set of tires, so I replaced the driveshaft just installed the other day and took on highway this morning to find i spent alot of money for nothing,

 

I have heard that the pinion nut may be loose but dont know the torque and have noticed when i changed the rear end fluid that the pinion seal is leak slightly but has never been low

 

Is your truck a SRW or a DRW. The torque specs are different for the pinion depending on the differential

 

Six speed or automatic?
I had a driveline vibration that was caused by a bad OD bearing in ZF-6.
I chased it the same way you are doing right now. New u-joints, carrier bearing, etc.
Installing a rebuilt tranny eliminated the vibration.

 

sorry it is a auto not sure about diff, 04/01 production when i do add diff fluid i have not put any addidtive for split not sure if i had a slip diff since it is 2 wd

 

Mine started doing the "death wobble" and it turned out to be a sticking caliper pin that was causing the drivers side brake to drag. I did a brake job and fixed the caliper pin problem and it went away. So, it can be a number of things.

 

thanks for all the help will try to post more often but of to disney and bike week at daytona

 

Well to all with a vibration . Mine is finally fixed after 2 sets of tires a couple of wheels , new u joints then a drive shaft , all fluids changed , rebalanced with a road force balancer, the carrier bearing had to be shimmed about 1/2 inch downward. there was a tsb about it some time ago with ford but not many techs know about it . Thank god that I did not have to replace the truck