Do some more research/ searches for first and second generation w126. You have a 2nd generation w126. The 83 is first generation w126. There were changes made between the 85 and 86 models if I remember right.

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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