I’m assuming that the rear axle on the wife’s suburban is a 10 bolt, but I could be wrong. I am not a Chevy guy, so I do not know for certain.

I do know that I would like to convert the rear to a disc brake setup.

Any options on this? An…
The 4×4 Blog Feed

On the inside of the 4x4 you will notice either an extra gear lever or dial on the dash which allows you to shift the vehicle into high or low range 4WD. As a general rule, for moderate inclines, slippery or sandy situations, use 4WD high range. For very deep water crossings, steep or rocky ground use 4WD low range. If you are not sure about this read your owners manual or join a club.