I have a problem with the 2-3 upshift and 4-3 downshift in the T-10 in my sprint. When I make the 2-3 upshift it goes in kinda hard, and it won't downshift directly from 4th to third unless I'm going real slow or go from 4th to 2nd to 3rd. I'm guessing syncronizer. Would an additive help? Thanks!