Mine is an '86 300E and I had the same floating/wandering problems in cross winds. I went ahead and replaced all the links of the rear suspension and the improvement was noticable.

But, I felt the car was still wandering a little bit in cross winds. So I ended up replacing all four sub frame mounts and that eliminated the problem completely.

Replacing all the struts is not too difficult. If you intend on replacing all the struts, talk to Phil at Fastlane and he has a kit that includes all the struts and bolt kits needed for the job.

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1986 300E (3/2002) Rear ended and totaled (10/2009)
2000 Xterra (5/2000)
1992 400E (11/2009) -Sold
1986 300E (12/2009) - Sold
2004 E500 Wagon (6/2013) - Sold