Starts good,but once it hits that mph it rattles then goes back to norm
SOURCE: vibration at and above 50 mph
If the shocks in the back are totally blown, that could be the problem.But, you may want to check the u-joints in the rear drive shaft. (just twist the shaft back and forth while the truck is off and in gear). Look at the joints while you're doing this. If there's clanking and/ or slop of any sort, they need to be replaced.
Good luck!
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