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Discussion Starter · #1 · (Edited)
2004 F350 105K miles, not dually.
I feel a clunk in the drivetrain most every time I stop. I crawled under the truck and when I rock the rear tires back and forth I see upper spring move and the rear pumpkin flexes/rotates upward and I get the "clunk" noise. I think this is what is creating the "slop" I feel. Don't see any flex in the u-joints. Ideas?
 

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Usually this is cured by lubing the slip joint in the driveshaft. Ford sells a special grease for this, it lasts quite a bit longer than most others will.
 
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