My 300SDL was grossly overtightened when I got it, took two hands to park! I backed it off and it was fine. You don't really have anything to lose by trying. If the box is junk, it's junk. If you back it off and everything is fine, that's $300 and several hours of your life you didn't have to spend on it. Just don't go down the rabbit hole of trying to eliminate slop in the wheel, if you have 1" of play, leave well enough alone - the rebuilt/new box will too.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]