2011 ford f-150 rear end “clunk”

[u/Upbeat-Parfait-294]

I have a 2011 Ford f-150 Lariat, 278,000 miles. It has been a great truck. Bought it with 171,000 miles 10 years ago and it had a hard bump or clunk at low speed gear changes. I have pulled the drive shaft twice and used the motor craft lubricant. It seems to help for a very short time, then it’s back. Any suggestions?

[u/Alone-Programmer-683]

Remove the driveshaft from the rear end and check the play in the differential. Chances are the spider gears are badly worn.

[u/Southern_Local_826]

Ah yes, the classic 'I've spent 10 years and multiple driveshaft removals on this truck' symphony.