I was busy fixing up stuff in my E300D like the idle control issue, condenser fan resistor, blower motor etc..

I joined the red vacuum line that leads to the right fender to the vacuum system, it was previously cut by the PO and I then had blocked off the cut vacuum line to prevent leaks, I joined the line, with a piece of rubber vacuum tubing and new clear MB plastic vacuum line. The shift behaviour has improved dramatically over the entire range, the HVAC system is also faster to respond.

I dont know how much the idle control issue resolved this but I believe the shift quality has improved

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)