Front HS bulkheads enable diff height modification using eccentric bushings. Into the front side gearbox, the diff height has a 2mm adjustment range in which 1 Dot is for top diff position. The diff height adjustment is an important set-up ability that enables quick set-up adaption for either Carpet or Dirt tracks. You can find 3 different angle configurations for adjustment associated with the front drive train. Carpet version runs with reduced trip height also to keep the drive shafts directly the differential is put in upper position. Dirt edition runs with upper ride height and to keep carefully the drive shafts straight the differential is positioned in reduced place. Fits XB4'21
