I am having issues with my rear axle diferential. When i get past 30 it starts to make a loud howl that comes from the differential housing. I checked the oil level and it was fine but the oil contained pieces of metal. Any idea of whats wrong and what exactly needs to be replaced? I was thinking of just getting the rear axle assembly replacing it all. But ive been to junk yards and all the ones i see are 8.8 and mine says 9.75 on the tag. Does anyone know what axle assembly's and years are compatible with my truck?

 

with metal circulating; replace everything. the pinion bearings, side bearings, crown and pinion are all compromised.

 

By everything do you mean the parts you just named or the whole rear axle assembly? I am trying to find the cheapest way to get it fixed