I know it's not the answer you're looking for (and I hope someone chimes in with that answer for you) but in the mean time, welcome to the group. You'll find a LOT of helps from the guys here. A lot of us have been together since late 2014 and watched all the changes Polaris has come up with. Wish i could answer that, but I haven't been involved wit hthe 2002 and newer models and the Prostar engine package
Not sure but the Autodrive is a hydraulic shifted manual tranny so it maybe a tank for the hydraulic oil. When my new 2020R was not shifting right Polaric was going to change out that system but didn't