I assume this is on the 300TD?

The transmission on the car is programmed to delay the upshifts following a cold start.

This is done for cold start emmissions to warm up the catalytic converter faster.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record