Tightening the bowden cable tension will delay your shifting until a higher RPM has been reached. Try one full turn at a time CCW when viewing the adjustment from the firewall towards the front of the engine. I just made this adjustment on my 300SD and now shifts perfectly!

John

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Certified Registered Nurse Anesthetist (CRNA)
2002 F250 powerstroke with Plantdrive WVO conversion
1983 300SD 190K miles ,sold
2006 E320 CDI