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Well the rear differential consist of a carrier (the diff itself) with a ring gear mounted on the left side of carrier, it meshes with a pinion gear and the other end is the yoke(this is the end that your driveshaft u-joint hooks to). A few things can cause slop in the unit, backlash, pinion depth, bearing wear. I have found that the gov-loc differential's fail inside the diff. There are alot of moving parts inside diff. The crossshaft or pinion shaft (nothing to do with pinion gear) starts to oval the seat holes in the carrier housing. Eventuatly a complete snap in half of carrier housing, which has a chain reaction. The ring gear is alot harder metal, and since it was bolted to carrier, now it chews and grinds everthing in the rear axle housing. It can also destroy the axle housing itself if your going fast when it snaps. luckly it will probally happen on a right turn, which u won't be going 40 mph +.Take off driveshaft and rotate rearend yoke see how much play is in the rear diff. (dont jack up tires for this test) you want the load on axle for this procedure. I can go on and on about this, but lets take it 1 step at a time.
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