Clutch or Trans problem? Help PLEASE!

[MongoE9]

While riding up a hill in 5th gear doing approx. 70 mph I heard what sounded like an engine backfire pop then lost all transmission power.  Engine whined and I limped to the shoulder.  I had no gears to hold from rolling back downhill.  Clutch lever seems to operate properly, and the shift lever seems to operate properly as well.  I trailered it to my destination and hours later had just enough trans power to limp into another trailer.  Now at home, after several days I tried it again and with the clutch pulled in and trying to start in gear the bike tries to roll forward.  When I shift from neutral to 1st I heard a grinding noise and then back to nothing again.

I am nowhere near as mechanically talented as the majority of you are.  Any help will be greatly appreciated.

Thank you!

[MongoE9]

Sorry, this is a 2007 Midnight Venture.

[Marcarl]

Sounds like it might be the u-joint going to the drive shaft,, maybe.

[MongoE9]

Thanks Marcarl