gator0308

Hey guys I have a 99 F150 xlt 4x4 extended cab with the 5.4. Last weekend I wss out in the mountains and noticed the normal squeaking of a u-joint going bad. Well to make a long story short I replaced both the joints on the rear drive shaft. Well now I have a bad vibration and drone from 70 mph up. I didn't notice it before the u-joints were replaced. Any help would be greatly appreciated.

Maulerman

Did you mark the yokes and the shaft(s) to maintain their orientation? If you get them out of alignment with each other you will get vibration. I did that on my 93 f150 that had a two piece shaft.

gator0308

I did not. I have it fixed now. I had to rotate the yokes until I had it fixed.