Can anyone give me some insight as to whether the rear shocks on a 95 TE need replaced if they are not leaking? The car has 95K on it and I am getting some thumping from the back end over bad bumps and I think it is the shocks, but how do you know? The shocks list for around $800, so I wonder if there is any sure way to tell, or is mileage a good enough reason. Thanks

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K