Just got a 89 300E from inlaws and it is all over the road when you increase or decrease speed, has a mind of its own. Been reading some other posts about bushings on the rear links rear diff mounts and possibly front strut mounts. Where should I start?

That's easy. You start with engine off and car sitting normally. Yank and shake each wheel in turn, gripping at 3 and 9, then again with a double-grip at 12. Report back what you find.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7

Start with the rear suspension. The torque struts and/or the supporting joints WILL cause the symptoms you describe.

See how much free play is in the steering wheel with the car turned off. My 85 300 td had a lot. I don't know if your's works the same but mine had an allen screw adjustment on the steering box that you turned counter-clockwise to take up the slop. This fixed mine and didn't cost anything. I went from 4 inches of free play to 1. Big difference in handling. Good luck.

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85 300 D TURBO 145,000 mi "liesel" (the hot chick in sound of music)