Removal from the car is very easy. It just bolts to the fender wall, 2 or 3 bolts. Then disconnect it from the steering input shaft (a collar with a bolt through it most likely), and pull the pitman arm with a puller. Be certain to center everything before starting.

I have never done this on a W124, but recently did my W126. I replaced all the seals except the steering input shaft seal (since it was bone dry) and - guess what - that one started leaking a couple weeks later. So I will have to pull my gearbox again just to change that seal! Take a lesson from me and replace them ALL at one time, and you won't be sorry.

Oh yeah, when replacing the gearbox be sure to use blue loctite on the 3 fender bolts and the pitman shaft nut.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280