I think it is shifting into 4th. The RPMs at 100 KPH is 2000 RPM. 100 KPH is about 62 MPH.

I changed the fluid and the filter. I put in Walmart synthetic transmission fluid, and a Febi filter and gasket. Drained the pan and torque converter. I couldn't get the plug out of the pan, must have put 100 NM onto the plug. I didn't want to put more in case the hex key started to strip. Any ideas on how to get the plug out next time?

That throttle position switch, does it have another name too? Where exactly is the switch located?

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1989 420 SEL