hi i have a 450 ford 2004 dulley, put 6 new tires on have a vibration at 49mps. tires seam ok, had both drive shafts and bearings replaced, old driveshaft had only 64000 on it but shop found play in it and said they caint balance them. still have same vibration as before. any idea what problem is i'm going broke. therebel

 

Did the vibration start after you put the new tires on? does it go away when you go past 49? does it go away when you let off the throtle but are still at 49?

 

happend after new tires added,goes away above 49 let off throtle hard to say possible yes,thanks.

 

Go back where ever you got the tires and tell them. They should rebalance them for free it sounds like you have a tire out of balance.

 

spent 200.00 on tires ,no help, took the spare tire i used when i had a flat and took off outside tire off rear no change took inside tire off put outside tire on no change put spare tire i trust on no change did this on both rear tire sets, tried spare on both front tires no change in vibration, new drive shafts didnt help. ???????

 

Can you feel it in the steering wheel?

 

Also did it hapen right when you got the tires?

 

started wirh new tires, no vibration in steering wheel.

 

There have been reports of bad tires/out of round tires being sold. I would jack up the truck after tires are warm. Set it up so you can spin tires to see if they are truely round. I found one which was bad and took it back. Good luck.

 

I would do like bigredtruckmi said and check to see if a tire may be out of round. Be sure to use jack stands when you jack it up so it's level off the ground. Now, when you set it up so that you can spin the tires be sure to have a flat surface under the tires as a reference point. Set it up so, it's like half an inch from the actual tread of the tires so that you can visually look at the tire tread as it spins over the flat surface to see if they're truly round. If not, then tire(s) will appear to go up and down on you. Hope this helps. Good luck!

 

hi thanks for the help,jacked truck up tires appear farily round going to try to find a shop with a roadforce balance machine. put new drive shafts in no help so gotta be in tires i hope. therebel.

 

Glad I could help. Just be sure to let us know how you make out after you get the tires re-balanced. Good Luck!