8 3/4 Assembly??
Here are some links that have a lot of information
http://www.pirate4x4.com/tech/billavista/Gear_Setup/
http://www.mopar1.us/backlash.html
http://www.mopar1.us/setuprear.html
http://www.mopar1.us/875rear.html
And here's a page with all kinds of information about an 8-3/4
http://www.moparts.org/Tech/Archive/axle.html
Other than this you might see if you can find a factory service manual.
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