Damaged trans?

I didn't see anything externally I was worried about the internal part of the tranny. It was actually the rear u joint that left go. Luckily I have a driveshaft loop that held the shaft from flopping around too much. The drive shaft took a pretty good hit though. The end that hit the ground is dinged up pretty good and im sending it out Monday to have it checked and possibly rebalanced. Once I get it on the rack tomorrow I will check the extension housing real good. So more than likely the internals are good?