1000, won’t move, goes clunk clunk clunk

2014 1000, put the tracks on, headed for the Bighorn mtn’s. About 18" of snow, not working hard, hit small drift, backed up about 10 ft, machine stopped with a clunk clunk clunk, won’t move, shift to fwd, clunk clunk clunk, won’t move.
I am not as familiar with these can am’s as I am about to become. Looking for ideas as to what I might have damaged. Machine is 20 miles from my truck. Wife and I hitched a ride out with snowmobilers last night. Any and all ideas are welcome. Thanks. 🙁