Yukon Gear Dura Grip Positraction For GM 9.5in w/ 33 Spline Axles
A 1999-2013 Silverado 1500 HD, Sierra 2500, Avalanche, Suburban 2500 or an Express or Savana van that leaves one rear tire smoking on wet pavement, or a truck whose factory G80 locker has started banging and quit locking, is the buyer this part is for. The Yukon Dura Grip YDGGM9.5-33-1 is a complete clutch-type positraction carrier for the older GM 9.5 inch semi-float rear with the 14-bolt cover and 33-spline axle shafts. It is the pre-2014 design, not the later 12-bolt-cover axle.
Inside the nodular iron case are composite clutch packs and forged 4320 chromoly spider gears. Springs preload the clutches, so the two axle shafts stay tied together in a straight line and torque goes to the tire that still has grip. In a turn the clutches slip enough to let the outside wheel run faster. That is a different behavior from the G80 many of these trucks were built with: the G80 runs open until a governor senses a speed difference and then locks hard, while the Dura Grip is working all the time and engages without the clunk. The unit is fully rebuildable, and Yukon lists a 2.440 inch deck height for this case.
Count the cover bolts first. Fourteen bolts on a semi-float rear with C-clip axles and a 9.5 inch ring gear is this axle. Ten bolts is the smaller 8.5 or 8.6, and twelve bolts on a 2014-up truck is the later 9.5 or 9.76, which takes the 2014-up Dura Grip instead. The full-floating 10.5 14-bolt on older 3/4 and 1-ton trucks also has fourteen cover bolts but is a much larger axle with no C-clips, so do not confuse the two. If the truck has a G80, read our G80 locker problems guide to decide whether the locker itself failed or the noise is bearings.
Yukon's application list covers GM 9.5 rears with the 14-bolt cover in both the 1979-1997 and 1997-2013 generations, including 1999-2013 Silverado 1500 and Sierra 1500 (where so equipped), 2001-2003 and 2005-2006 Silverado and Sierra 1500 HD, 1999-2004 Silverado and Sierra 2500, 2002-2013 Avalanche, 2000-2013 Suburban and Yukon XL 1500 and 2500, 1997-2013 Tahoe and Yukon, 2003-2009 Hummer H2, 2003-2006 SSR, Express and Savana vans through 2014, and 1979-2000 C/K, R/V and G-series trucks and vans. Many half-ton trucks and SUVs in those years came with the 8.5 or 8.6 instead, so check the cover and the RPO axle code or send us your year and VIN. More GM rear parts are in the hard parts section.
If you would rather have a gear-type unit with no clutches, compare it with the Eaton Truetrac for GM 9.5 and our Truetrac buyers guide, but check that unit's year range against your axle.
| Brand | Yukon Gear & Axle |
| Part number | YDGGM9.5-33-1 |
| Fits | Yukon Gear Dura Grip Positraction For GM 9.5in w/ 33 Spline Axles |
| Type | Differentials |
| 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.
No. 2014-up trucks use the 12-bolt-cover 9.5 or 9.76 rear, which takes a different Dura Grip (YDGGM9.5-4-33-12B). This one is for the earlier axle with the 14-bolt cover.
No. A 10-bolt cover is the GM 8.5 or 8.6. This unit only fits the 9.5 inch rear with the 14-bolt cover and 33-spline axles.
Yukon does not list a ratio split for this case. It is sold for the 9.5 with 33-spline shafts, but confirm your ring gear fits the carrier flange if you are running an unusual aftermarket ratio.
Yes, it replaces the complete carrier. It works as a clutch posi that is always engaged, rather than a governor-triggered locker.
Yukon recommends a high grade non-synthetic GL-5 gear oil with Yukon LSD additive (OILADD). Synthetic oil is not recommended for this unit.
If the carrier bearings are original or you are changing gears, yes. A GM 9.5 master overhaul kit for your generation covers carrier and pinion bearings, races, shims and seals.
