anyone had this problem with a borg warner t56 trans fitted few years ago using a wier hot rods bell housing to a 350 small block with a isky 280 mega cam box sounds real bad at idle box was new when fitted , removed and striped down trans and found nothing wrong rebuilt with new bearings fitted new mcloud clutch ,trans is great to drive and shifts perfect , problem is at idle but as soon as you put pressure on clutch pedal noise goes away ,Any thoughts on what fluid to use could it be the cam lumpy lumpy highlighting any backlash in the gears