Thanks for the replys and checking the parts that you had. From the info that I have gathered all the above information is correct. There are some above that I would like to find out what they belong too. Once we can verify this, I will update the origional post.
So far I have come up with the following info. This information was compiled by talking to other DSM'ers and getting them to look at their diff.
Another way to tell the difference between a 1G and 2G differential when it is out of the car is.....
"The 2G bolts up with three bolts on each side of the nose cone and two on the rear cover. The 1G bolts up with two on top and one on each side of the housing. Then it has two on the cover just like the 2G." (1gkfwd link forums)
If you are lucky enough, the diff will still have a sticker. This sticker will state the reduction ratio. This is a good Identifier of what car it belongs to. Keep in mind that covers can be changed. Look at this link for a picture from WES_393 on Tuners
Rear Differential Identifiers??? Manual vs Automatic
1G AWD Auto - 3 bolt LSD - J1G
1G AWD Auto - 4 bolt LSD - J1H (2highpsi and 1gkfwd link forums)
1G AWD Manual - 3 bolt LSD - B1G
1G AWD Manual - 4 bolt LSD - B1H
2G AWD LSD Auto - JFH (1gkfwd Link Forums) BFB (WES_393 Tuners)
2G AWD LSD Manual - BFH
Diffs that we still need to identify are
All Conventional diff models. (There are two types of diffs. One is the LSD's which seem to be the most common and conventional diffs which I have yet to see)
All 2G models
Please verify that the numbers you post are correct by either counting the ring and pinion teeth or by using the diff in your car for a period of time with no ill effects. I am not asking people to open their rear diffs if they are in use on the car, just rear the numbers and post them up.