The main structural portion of your sled that all the important stuff bolts to. It would be the extra 3 or 4 12 mm headed bolts left over after you remove the cover off the chain case, securing the chain case to the bulkhead. Not including the brake assembly. Unbolt it as a unit and lift off.
Did you remove the speedo bearing? There are two torx set screws.(although that might not matter). And I completely pulled the chaincase cover out to pull the driveshaft off. A lot easier.