Pulling the Perkins 108 and BW71C (10-17-012) out this week. while unbolting the propshaft coupler, I thought I would click the trans into fwd or rev to hold the shaft from turning while I undid the coupler. But, the tranny turns freely whether in fwd or reverse. Is that normal? I always thought that putting into a gear without the engine running would stop the shaft from turning, ie; putting in reverse while under sail to stop the prop from turning. Anyone with BW trans experience.