Took my new to me 92 300SE, 98,000 miles, on our first road trip this weekend. Noticed about 4 to 6 times each way that while the cruise was set at 75MPH, the trans would appear to down shift. No drop in speed, just RPM from around 3,000 to around 4,000. Would stay there for 1 to 3 miles then shift back up with corronsponding drop in rpm. It also did this not on cruise control, not going up hills, not passing, just level smooth driving


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85 300SD
92 300SE