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)