Front & back bulkheads feature a horizontal split design (HS) to retain simple diff access while including the valuable brand new diff height modification. The initial design associated with bulkheads makes use of an inline bushing to change the positioning and height associated with bevel drive gear. Along with accommodating the diff height adjustments, it also permits leading central driveshaft to operate with a lowered angle for less friction and wear in the CV joint elements and improved driveline effectiveness. The XB4 bulkheads allow easily differential access for setup changes or servicing by detatching only 4 screws from the top gear box address although the reduced area remains mounted towards the chassis. This super-fast diff access is featured on both front and back gearboxes. The super-strong, narrow bulkheads provide the required clearance the redesigned suspension holders with an increase of set-up range possibilities. Fits XB4'21
