Piston Slap: Dat Whining Azz!

TTAC commentator EducatorDan/PrincipalDan writes:

Long time listener, comment-er, hanger-on with another question.

I have a 2004 F150 Heritage 4×2 that just cracked the 100,000 mile mark and recently I’ve noticed a distinctive rear differential whine. It has the 4.6 V8 mod motor, 4 speed auto, and (as you can see from the pics) an aftermarket flatbed.

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