OMG rear diff don't use any backlash aka play you will spend kiss $$ bye for no reason. Shim tight feeling the high spots eliminating any back and forth movement. Theirs one guy at my track with
diff issues over two years tried to give some pointers but he keeps blowing gears. I've replaced one set after two years no clicking noise period from AM to PM hot cold raining snowing oh it doesn't snow in hawaii but trust this method it works.