I have a 1987 sunsport with a 351 and a 1:1 Borg warner velvet drive. I totally blew up my reverse clutch plates at the end of last year. l just got it rebuilt by a local mechnic recently, and now I hear a fairly loud audible clunk as if someone just slammed it into reverse when I shirt it into reverse. It does not make any sound going into forward. I always make sure its in neutral for at least 1-2 seconds before shifting, Any ideas?