The 5th gear solenoid is on the valvebody itself and it is controlled by an HGS module - did your conversion guy install that too?

usually you lose 4th gear in these, and the box shifts from 3 to 5.

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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)