Transmission adjustments? 1987 560SEL bumping into 3rd

[American28]

Hi,

Thanks for any help you can be.

A few transmission questions:

1 - My 1987 560SEL transmission seems to not be right. From 1st to 2nd it switchs smoothly at about 20 MPH and about 1600 RPM's. From 2nd to 3rd though, it sometimes switches smooth but sometimes with a moderate bump. It does this switch smoothly and with bump at about 26 MPH and 1600 RPM's. Is this the right gear switch RPM and MPH and how can I eliminate this bump?

2 - Overdrive - when traveling about 45 MPH at appx 2000 RPM's I press the pedal to the floor. The RPM's go from 2000 to 5000 and the vehicle does not really accelerate during this rev up. It takes about one full second (while the engine RPM's are rising but the car is not accelerating (side note - is this called flair?)) for the power and speed to kick in. Should it take this long? - It seems too long to me.

Again, thanks for any help you can be.

Lance