the trans is starting to shift roughly. from 1st to 2nd it feels like its going into gear but it will jump out. Then when i try to put it back in it grinds. also it will feel like there is a bar in front of 3rd preventing it from going into gear so il wigle it in neutral an itl go. it will also do this for reverse so ill put it in 1st then reverse and it will work.Any ideas whats wrong??? Had the trans and diff. fluid changed at 54K and its only 59K. Thinking of putting Lucas in the trans and diff.to see if it helps. also gonna try The z max fuel and oil treatment. I use royal purple 5w20 and dont know if i should mix the royal purple ,zmax oil treatment, and the lucus oil stabilizer