Don't know how many tech's have ever built rear end, I'm sure it's less than 1%. Most shops want to "replace" with used or rebuilt because of failure. Most failures are from improper preload!! Preload on side carrier bearings is critical, some of us old guys know a lot af secrets on set-up.

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MERCEDES BENZ MASTER GUILD TECHNICIAN
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. Shopforeman
190E 2.3 ITS RACECAR
1986 190E 16V