GM 1500 4WD Front Differential Pinion Yoke 697-699

This is Dorman 697-699, a cast iron front differential end (pinion) yoke for GM half-ton 4WD trucks and SUVs with the independent front suspension axle. It replaces OE part numbers 15588336, 12471590, 84953426 and 88967027. A new pinion seal and pinion nut come in the box, so the seal lip rides on a fresh surface.

Listed fitment: 1999-2014 Cadillac Escalade, 2003-2014 Escalade ESV, 2002-2013 Escalade EXT, 2002-2006 Avalanche 1500 and 2007-2013 Avalanche, 1998-2000 Chevy and GMC K1500 and 1998-1999 K1500 Suburban, 1999-2013 Silverado 1500 and Sierra 1500 (plus 2007 Classic models), 2001-2006 Silverado and Sierra 1500 HD (except 2004), 1998-2014 Tahoe and Yukon, and 2000-2014 Suburban 1500 and Yukon XL 1500. The yoke takes a 3R-series U-joint, 1.125 in. cap diameter and 2.556 in. lock-up width per Dorman.

Why it gets replaced: the pinion seal runs directly on the yoke neck. Once that surface is grooved, a new seal alone will keep leaking gear oil onto the front driveshaft and crossmember. Worn splines show up as a clunk when you shift between drive and reverse or engage 4WD, and a bent or damaged yoke ear causes a front driveline vibration that changes with speed.

On the bench: mark the driveshaft to the old yoke so it goes back in phase, pull the shaft, and check pinion rotating torque with an inch-pound torque wrench on the nut before anything comes apart. Hold the yoke with a flange holding tool, remove the nut, and pull the yoke with a puller rather than a hammer. Drive in the new pinion seal square, slide the new yoke on the splines, and tighten the new nut in small steps, checking rotating torque as you go until you are back at the original reading plus a few inch-pounds. If you overshoot, the crush sleeve has been over-compressed and needs to be replaced, so go slow. Refill the axle and check for leaks after a test drive.