STAGE 4 - BILLET DIFF (SPOOL)
 
Run Rear  Axles in your Front X3 Smartlock Diff
SPOOL - FULLY LOCKET AT ALL TIMES
Much Larger FORGED Ring and Pinion
Tapered Roller Pinion Bearings
Billet Case + Side Cover
Internal Oil Pump
Adjustable Backlash + Bearing Preload (Shims included)
GEN II (Narrower Spool) suits 2018 and later X3
 
Requires Driveshaft to be shortened and 1310 Uni Joint Yoke to be welded to OEM driveshaft
 
Custom Colours include Red, Blue, Silver
Please allow 2-3 weeks to have your diff case anodized in your selected color and be assembled ready for shipping 
Import tariffs may apply in most countries, including USA