THANKS guys for the replys. before this happened ,when you cranked the car it was smooth( still had lope from cam ect..) but it was smooth. When i first cranked it after the trans build , it was rough feeling, how do i say it it felt like it wasn't ballanced just sitting there,not in gear or any thing .Just wondering if its got some to do with the weight on the converter or could the flex plate have got bent during the shift in to reverse while peged in drive. i'm almost sure its a 70 year motor think its got a mp crank in it but will check tomorrow. it feels like its out of balance some how. if the converter bolts in only one way could the weight been welded on the wrong side. Is there some way to check this .weight lines up with certain postion of crank or what.you dont even have to put it in gear to feel this . thats why i feel sure its not in the drive line. Maybe more sugestion on what to check, thanks Also when i drove the car after the reverse stunt it didn't have this feel just wouldn't change gears.thats why the trans rebuild.