I installed a coast valve($149.24 shipped) on my RTV 900 to get rid of the sudden jerky stops from the hydrostatic tranny.This is a new machine now that jerky stops are gone and the RTV slows down more gradually and the tranny shifts smoother.I would say if you live in hilly terrain or pull a trailer and need the hydrostatic braking keep what you have now,if not put in the coast valve.coobie</p>