I put it in drive it just made the loud grinding noise from underneath the truck?

Hello, I'm Danny.

Yes, it sounds like you had an internal hard part failure. Just to give you an idea most transmission repair shops will not just do a quick fix but rather they will require a full rebuild. A transmission like your 4L60E will be in the ball park of $2,000.00 for a rebuild to give you an idea depending on your area and what kind of repair shop you take it to. Here is a tutorial showing how to remove and replace a manual transmission which is similar:

I've attached picture steps below on how to remove and replace the automatic transmission on your Silverado. Hope this helps and thanks for using 2CarPros.