How do you change transmission fluid on a 1999 polaris atv trailboss?

To change the Transmission Fluid on a 1999 Polaris ATV Trail Boss, first ensure the ATV is on a level surface and warm the engine slightly to help the fluid drain. Remove the drain plug from the transmission case and allow the old fluid to fully drain out. Once drained, replace the drain plug and refill the transmission with the recommended type and amount of fluid through the fill plug. Finally, check the fluid level after running the engine briefly to ensure it's at the correct level.