The Yukon Small u-joint Grease Gun, 4 Ounce Capacity. (Part number YP SJ-ACC-402) Yukon Gear & Axle manufactures a full line of top-quality small parts to complete any job including ring gear bolts, crush sleeves, pinion nuts and washers, axle studs, thrust washers, and much, much more. For all your differential small parts needs, look no further than Yukon.