When I lived in greeley twelve years ago, I had a set of gears put in my old chevy. I put 200,000 miles on that set of 4. 10s. I cant remember the name of the place, Maybe precision, but I know he moved his shop next to the highway, west of the greeley mall. Thats where the store was when I drove through there a couple years ago. The owner had a nice chevy powered land cruiser. He was quite knowledgable and helped me with a vibration problem that developed that wasn't his fault.