I had ford replaced the rear pinion seal because it was leaking after a day I leave shop when I turn u can here a noise like a rumble strips on road it has gotten more noise when do sharp turns would this be from overtighten the seal

 

Vehicle details, please.

 

2011 f150 super crew 3.7 engine

 

2011 f150 supercrew 3.7 liter

 

Does the truck have a traction lock rear? If so and they changed the fluid, they may not have put any or enough friction modifier in the new fluid.

 

yes it has traction control it does fine going straight but once u turn sounds like u are running over rumble strips on road

 

What Roadie said. Limited slip differentials need friction modifier. What is the AXLE code on the door jamb sticker?

 

b6.

 

So, your truck has a 3.73 ratio rear diff with a clutch type traction lock rear. The noise is most likely coming from the clutches not having the correct viscosity fluid to allow the clutches to slip when turning. Buy a bottle of friction modifier from Ford and add it to the diff. You may want to ask the shop what fluid they put into the diff. If they weren't smart enough to add the modifier, they may not have been smart enough to use the correct fluid.

 

The required fluid in a traction lock Ford rear is 75W140 full synthetic gear lube and a bottle of Motorcraft XL-3 friction modifier. You would THINK that if a dealer did the repair, they would have used the correct fluids. Take it back.