Does the rear wheel spin freely with the bike on the center stand and in neutral?
I'm wondering if the pop you heard was the rear Torque arm you mentioned breaking free of the brake drum thus causing the rear wheel to lock up. If the drum rotates too far with this bar disconnected, it can cause the rear brakes to activate holding the wheel in place.
The pop could have also been the brake cam rotating between the brake shoes as the drum rotated.
Regardless, sounds like you may need to pull the rear wheel to inspect both the drive splines and brakes anyways.
......I'd rather wake up in the middle of nowhere then in any city on earth.
*2014 VN900 Custom (16,200 miles and counting)
Last edited by Ndr; 03-21-2013 at 02:07 AM.