This past summer I removed the factory 10 bolt from my 89 Suburban and replaced it with a 12 bolt. Then I changed the gearing from 3.08 to 4.10. I just used the instructions with my Richmond ring and pinion set and things went great and still no problems even after 6000+ miles and some occasional towing.
As far as pinion depth tools are concerned there are several different types
I tried this on first
http://store.summitracing.com/partde...5&autoview=sku But it was a joke. The threads on the dial indicator stripped out the first time I threaded the extention into them and I had to usse teflon tape to make them snug enough to take readings and every reading was different because of the cheesey design of the tool. The tool I wanted was like $400 bucks!!! But I decided to try this one for $30
http://store.summitracing.com/partde...5&autoview=sku It worked great!!!
This was my first ring and pinion setup and it was cake when I got that tool.