Sounds like a double up shift occured? I know on my 420SEL I can have a double down shift..one if i squeeze the throttle to near the kickdown switch and two if i hit the switch...provided in at an appropriate speed.

There were no factory overdrive units that I am aware of.

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82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k