X-Carve Pro 4x4 Tram

Is it possible to Tram the x-carve Pro 4x4? When I surfaced the waste board the board has very small high spots/ridges where the bit passed though. I feel as the Y axis (front to Back) is slightly off. I have check the gantry and where it bolts to the base and everything is sitting good and the bolts are torqued to spec. Any ideas?