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Originally Posted by Victor300E
Hi. I have 92 500sel. 150k miles. Rear suspension makes clunking noise over bumps. No noise over little bumps. Car rides smoth otherwise. Shop replaced control arm bushings as they were worn out. Clunking became quiter but still there. Shop says all other bushings are fine. Is there anything else I can check for play? 
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Unless I miss my guess, the W140 came with Self Levelling Suspension. The hydropneumatic struts and hydrogen accumulators (aka spheres, aka bellows) can fail producing the clunk you are speaking of. This is not uncommon for SLS equipped cars (W124 500E , W201 190E 2.3-16, W124 300TE, etc).
If your car is so equipped, have your shop check the condition of the struts as well as the accumulators.