Squeaking while driving is most likely your ball joints. Check to see if the ball joint boot is ripped. Sometimes the grease gets dry and they start to squeak. Replace them ASAP.

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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