Ok.. That makes sense... This is why I do not deal with gears
If you have any wrench sense at all working on the rest of your car, and have the tools, I highly recommend trying one for yourself.
I always thought it was some sort of 'black art' myself, and since I only dealt with 8"/9" rears early on, my idea of a gear change was buying a chunk with my chosen gear already set up by someone else, and swapping the chunk into my housing.
Later I got into Dana 60s and 8.8"s, and this option was no longer available. So the first gear change I farmed out to a 'reputable' shop who had a guy that set up rears for dirt track racers, and he was said to be good. He effed my Dana 60 up soooooo bad! He broke the new locker I bought for it, and left some of the shims totally out of the rear... not wrong, but totally out. So I decided to do my own after that nightmare.
It really isn't bad once you see what is going on. The hardest part for me personally is reading the gear pattern in the marking paint. I am a perfectionist, so the pattern is NEVER good enough for me when I look at it. I just come to the realization that I will never be satisfied with how it looks, so I check it over and over and over and.... Eventually I get to the point where can let it go, even though I have yet to see a perfect pattern before I close one up. So far, knock on wood, all but the very first one I ever did (Dana 60) have turned out great. This is just a personal problem for me. Alot of folks don't have a problem reading the pattern, it's my personal baggage that gives me trouble with it.
I want one of these, by Ratech. They claim it makes setup on an 8.8" even easier.