Yukon Gear 10 Bolt Open Spider Gear Set For 00-06 8.6in GM w/ 30 Spline Axles
A clunk when you get on the gas in a turn, a click every wheel revolution in a tight parking lot, or a cross pin that has walked out and chewed the case are the problems that send Silverado, Sierra, Tahoe, Yukon and Suburban owners looking for spider gears. The Yukon YPKGM8.6-S-30V2 is a complete open spider gear set for the 2000-2006 GM 8.6 inch 10-bolt rear with 30-spline axles, and it replaces the parts inside the carrier that do the work every time the truck turns.
In an open 8.6, the ring gear turns the carrier, and the carrier drives the axles through four gears: two pinion gears riding on a cross pin, and two side gears splined to the 30-spline axle shafts. Going straight, the set turns as one piece. In a turn, the pinion gears spin on the cross pin so the outside wheel can run faster than the inside one. Thrust washers behind each gear take the load against the carrier. The 8.6 is a C-clip axle, so the cross pin is also what keeps the axles from sliding inward, and it is held in by a single small lock bolt. Yukon's set includes two side gears, two pinion gears, the cross pin shaft, the cross pin bolt and the spider gear thrust washers.
Pull the cover, rotate one wheel with the other held, and look for chipped teeth, rocking side gears or a loose cross pin. Check the cross pin bores in the carrier; if a walked-out pin has cracked or egged out the case, gears alone will not fix it. Our spider gear failure guide covers the inspection, and the GM 10-bolt problems guide explains how the 8.5 and 8.6 differ.
Yukon lists this set for 2000-2006 GM 8.6 inch 10-bolt open differentials with 30-spline axles. Fitment notes for this part number call for the carrier casting number 7875 or 1073, a case with one large and one small window, and say a 1999 truck needs a new carrier to use it. Later 8.6 axles were built over several years, so read the casting on your carrier rather than going by model year, or send us the year and VIN. It does not fit a factory locker or limited slip carrier. If your carrier is damaged, the loaded GM 8.5 and 8.6 open carrier replaces the whole assembly, and more parts are in our hard parts category.
Spider gears change without pulling the carrier, so the ring and pinion setup is not disturbed. Drain the oil, pull the cover, remove the cross pin lock bolt and cross pin, push each axle in and take out the C-clips, then slide the axles out far enough to roll the old gears and washers out. Install the new side gears with their washers, roll in the pinion gears, slide in the new cross pin, refit the C-clips and axles, and torque the new lock bolt with thread locker so it cannot back out again. If the truck is due for bearings too, the Yukon 8.6 master overhaul kit covers the whole axle, and a nodular iron 8.6 cover is worth adding on a truck that sees rocks. Refill with 75W-90 gear oil to the bottom of the fill hole.
| Brand | Yukon Gear & Axle |
| Part number | YPKGM8.6-S-30V2 |
| Fits | Yukon Gear 10 Bolt Open Spider Gear Set For 00-06 8.6in GM w/ 30 Spline Axles |
| Type | Differential Spider Gears |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The 8.6 is the 10-bolt rear in many 1999-up half-ton Silverado, Sierra, Tahoe, Yukon and Suburban models. This set is listed for 2000-2006 8.6 open axles with 30-spline shafts; confirm the carrier casting 7875 or 1073.
Two side gears, two pinion gears, the cross pin shaft, the cross pin bolt and the spider gear thrust washers.
Fitment notes for this part say a 1999 truck needs a new carrier case to use this set. Check the casting number on your carrier.
No. It is for the open differential carrier only.
No. The carrier stays in the housing, so backlash and bearing preload are not touched. Only the cover, cross pin, C-clips and axles come out.
75W-90 gear oil. An open differential does not need friction modifier.
