Driveshaft hitting trailing arm crossmember

[cdog73]

Doing a LS swap with a 4l60e and noticed the driveshaft is going to hit my CPP trailing arm crossmember. I'm using the 2000 Silverado transmission mount and not sure if that is the cause of it hitting or not. I'm also using a stock style motor mount , so could it possibly be that the motor is sitting up to high in the truck? Any help would be greatly appreciated. I'm also using a Porterbuilt trans crossmember, if that makes any difference. thanks again guys.