differential

So boys my rear differential just went out on my 05 Z71. I'm having a hell of a time sourcing a replacement GU6 3.42 differential. Every truck or suv part out I find has GT4 or G80 differential. My question is does anyone know what Suvs or trucks & or models came with a GU6 3.42 differential...

In Nov 2020, I had the entire front, and rear differential replaced. Just the other day, we started hearing strange sounds coming from the front. My mechanic suspects something in the front differential. The problem is that it has only been 13,000 miles since that work was done. I bought the '02...