Changing Tracks

I am new to the sport, just moved here from florida (wisconsin) bought three used sleds for the family. All three need work but the price was right. working on the polaris right now - Indy RXL 650 triple fuel injected electronic ignition. runs great - I have rebuilt suspension - all new bearings and shocks, bought new track - having trouble getting drive shaft out - I have removed secondary clutch, speedometer housing, gear cover, gears and chain, found coller with set screw on shaft - removed set screw - shaft wont budge, has anyone ever changed out a track - any ideas thanks in advance

Gator - stuck in wisconsin