I just got my tranny rebuilt last month in my 2001 Blazer. I noticed after a long drive in hot weather, tranny will make a slight scraping sound from the torque converter area when holding down on brake and revving engine. It won't do this when cold or warm. Only when driving about a half hour. It does it in 1st and 3rd gear, not 2nd or reverse. Is this something I should be concerned about?