my sportsman was hard to shift out of high also turns out the linkage was catching on the plastic cover that hides the moter pull it off and see if there is some scratches from the shifter catching if there is bend the rod a little in thats what i did...

 

Had same problems with my hawkeye. Dealer rejetted and is like nite and day.
WIll climb a hill with littel or no effort in 4x4.
Also no has loads more pickup. Got it to 50mph on asphalt.