I have a howling noise coming from my rear and im pretty sure its pinion bearings about how much is it to replace these and is AAMACO a good place to take it.

 

http://www.4x4now.com/gt0699.htm
http://www.differentials.com/diagnose.html

 

I replaced mine a couple years back and I dont think I spent more than a hundred for both bearings seal kit and gear oil. Its a relatively simple but you need a ft lbs torque wrench and an inch pounds torque wrench and a dial indicator to set back lash. HAHA ok thats what chiltons says i didnt use any of them and so far so good. the inch lbs torque wrench is to put proper load on the bearing, basicly how tight you tighten the pinion nut. the backlash I just went by making sure I had some but not much. Im a back yard mechanic so my way isnt the right way but it has been fine ever since. I would replace your rear axel seals at the same time since you have to pull the axles anyway. I didnt do it and wish I had.

 

anyone have a price

 

$500.00 having it done today, all the bearings at once ay local shop. Good Luck