Recommendations for differential/ axle repair Northern Colorado?

I am hearing some noise in my rear dif. 94 f350. Looking for Northern Colorado only. Greeley to Loveland and north.

Thanks guys.

Before SouthPaw responded, I heard back from the shop I usually use.

(even called after hours)

The Wrench in Greeley is great. I’d take my grandmas car there. PM if you want more details

Is there fluid in it?

Bullhide 4x4