This Yukon Gear crush sleeve spacer is specified for early Isuzu Trooper applications that use a Ford 9.75" dropout, serving as a pinion preload spacer in that differential setup. Yukon offers a range of differential small parts for rebuilds and conversions; this crush sleeve provides the necessary spacing for correct pinion preload in the described 9.75" assembly where that fitment is required.
Yukon Gear Early Trooper Crush Sleeve