I have a C 27 TR with the A-4 gas engine. I always (try to remember) to put the gearshift lever in reverse, or forward to keep the prop from spinning while sailing. I do this because the xmission gets its lubrication from engine oil under pressure while, of course, the engine is operating. The prop may not turn at a high rpm, nevertheless...... I forget the type /brand xmission my 1979'er has. This makes alotta sense to me..... Jim Huhta S/V "SEA-130" Sturgeon Bay, WI