^^^ chk your tire spin.
Before any work is done or committed to get a second or third quote.
If there is no noise like a wheel bearing grinding or the truck is doing a rear steering thing or one of your rear wheels passes you while going down the road… wait a while and see what the truck is telling you.
if no noise increase, leave it be until you get another indicator.
If you really want to look at it, jack up the truck, put it on stands, remove the rear cover, look and see if things are in place and not bent up or broken and put in some clean gear lube.
Have a friend move the axle in and out while you are looking at the diff and see what is going on.
4x4, 5sp, Std Cab, Stepside, E4 Red
4” Lift - Coil-Overs, 6” SkyJacker Leafs - No Blocks (Mistake)
31 Spline FX4 Rear Axle, 4.56s and OX Locker, Hurst Shifter w/Optional Stick and "Made by Grev" alignment adapter