How do I reset the pinion adjustment on my 06 Ford F-150

 

It might help to say what was done or what happened to cause a need to reset?

 

Welcome to FTE:

Pinion adjustment would be something done when setting up the differential. If you tinkered with the differential and were just hoping to put it all back together the way it came apart, you are in for a sorry surprise.

If you axle is merely worn (or worn out) and clunks (or is on the verge of breaking) then you either run it or replace the ring and pinion, again with proper set up.

IMO setting up a rear axle is probably 8 on a scale of 10 for automotive type jobs. Find a shop that knows your vehicle to have it done, or if you must diy, be prepared to learn a new hobby as you may be doing it 2 or more times.

But see post 2 first.....