Check out post 48 here. This is also handy if you are going down a steep ledge offroad and you don't want the suspension unloading too much causing a end over roll. Lots of rock crawlers do this.
Project Beat the Baby- 76 FJ40 -5.3, 4l60, Atlas, Dynatrac 60 etc
Project Beat the Baby- 76 FJ40 -5.3, 4l60, Atlas, Dynatrac 60 etc