F250 u0026 F350 4WD Air Lift LoadLifter 5000 Ultimate Rear Air Spring Kit InstallCenter style=font-familygeorgiafont-size110% Rear Application Kit. Mount in the included mounting cup, flush mount or insert into any 2 1/8 inch gauge pod. Then, deflate when riding empty. The item air lift control air spring & dual air compressor kit for sierra 2500 hd 4wd/rwd is in sale since Monday, October 9, 2017.