I got a reverse shackle lift on a 2000 f-350 four door with 8 foot bed. I have moto metal rims and 315 tires. When I drove the truck from maryland to florida i noticed a really bad vibration that seemed to get worse as the speed increased but vibrates at any speed. the faster you go the more severe it gets. any ideas on what might cause this?

 

My guess would the the carrier bearing....you've got a 2 peice rear drive shaft correct? If u lift any of these trucks from stock and dont put a spacer between the crossmember and carrier bearing it puts a bad angle on the u-joints and it shakes. Mine did it but was spaced...not enough so I threw a inch spacer in there and cleared it up.

Also check the condition of the bearing...make sure its not on the way out too.

Thats all I can think of atm. Good luck

 

thanks alot what kinda spacer should i get?