are you seeing the digital readout for the gear position on the gauges? - or is it blank?

If its blanked out - the TCU can hang and not apply any gear. How come your output speed is registering on a stopped car?

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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)

My tranny did that on my 300e diesel and the transmission was toast

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1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero

That is a bit generic for a diagnosis.

Rob

The transmission line to the cooler became pinched or crimped somehow and restricted the transmission oil till it literally fried everything. It was running good then within 15 minutes went from making noise to a clunk to flatline. New transmission

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1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero

My transmission did not overheat, it just stopped working.

I see the gear in the display (and in DAS).
N2 and N3 are both input speed sensors, N2 reads the speed of the front sun gear and N3 of the front planetary carrier.

Rob