Hi, i have problem with my transmission, about 2 months ago my fourth gear started needing high revs to engage, all of my other gears work and change fine, but my fourth gear needs about 3000 - 3500 rpm to engage. I've changed the K1, K2 pring kits B2 break band teflon seal and the thrust pin about half a year ago, but this issue starterd about 2 months ago, what could be the issue ?