I have a 1998 F-150 extented cab. i have a new vibration when im driving. i have had the tire rotated and balanced, i checked the U joints they are fine. i noticed that on the front u joint when i move the shaft the shaft coming out of the transmission is loose. My question is there a bushing inside the back of the transmission if so how hard is it to repair. second question is did ford come out with a updated shaft to replace the original one to help prevent this vibartion problem thanks again for this forum.