On a w126 you can remove/ install the rear shocks without compressing them. I did. The rear springs are the easy ones to change, it's the front ones that will kill you.

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If it ain't broke take it apart and find out why.

1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King

Ride in Peace Eric Peterson, Harley of Macon