I have Crusader 454 with Velvet Drive. When put in gear I have rattling noise in forward and reverse not neutral. Had read several links looking for Solutions. I've tried testing for spark with the distributor cap and the sounds good. Removed coupler from Drive and still have noise in gear. Also heard there might be water on a cylinder. All spark plugs look normal. And the oil is still nice and clean. One mystery I have though is it looks like exaust sut floating on top of the coolant in the heat exchange. Was wondering if that meant a leak somewhere that could cause that knocking. If not getting ready to remove the gear to look at damper plate could use an opinion please