Yukon Gear 9.5in GM 4.11 Rear Ring & Pinion Install Kit Axle Bearings and Seals
A 2014-and-later Chevy Silverado 1500, GMC Sierra 1500, Tahoe or Yukon that has picked up taller tires usually tells you right away: it feels flat pulling away, the transmission keeps kicking down on the highway, and towing turns into a gear-hunting exercise. The Yukon Gear & Axle YGK2250 is a one-box re-gear for the GM 9.5 in. 12-bolt rear axle on those trucks. It puts a 4.11 ring and pinion, a master install kit and new axle bearings and seals together, so the whole rear end gets done in one teardown instead of three orders.
The ring and pinion set the final drive ratio. Moving to a numerically higher 4.11 turns the driveshaft more times per tire revolution, which gives back the leverage a bigger tire takes away and brings engine rpm back to where the transmission shift schedule expects it. Yukon lists the gear set in this kit as a 9.50 in. ring gear for the GM 9.5 with 12 ring gear bolts. The master install kit supplies Timken bearings and the small parts a gear setup needs, and because the axle shafts have to come out to pull the carrier anyway, YGK2250 also includes the axle bearings and seals for the wheel ends. Yukon notes the kit is built around carriers designed for 3.42 and higher ratios, with a carrier deck height of 2.6 in.
Confirm the ratio you have now: the axle RPO code on the service parts label or a VIN decode tells you, and counting driveshaft turns against one tire turn on stands double-checks it. Next confirm the carrier. This kit is meant for carriers built for 3.42 and up, so a truck that left the factory with a lower ratio may need a different carrier, and an optional locker or limited slip changes the parts list too. If the only complaint is noise and the gear teeth look clean, the Yukon 2014-up GM 9.5 12-bolt master overhaul kit alone may be the fix.
YGK2250 is for the GM 9.5 in. rear axle with the 12-bolt cover and 12-bolt ring gear, the design GM used under its 2014-and-later half-ton trucks and full-size SUVs. It does not fit the older 14-bolt-cover semi-float 9.5. GM also ran a 9.76 in. rear axle in the same body style, mainly with the 6.2L, and the two look alike from under the truck, so read the size cast into the housing before you order. If you are unsure, send us the year, engine and VIN and we will check it. Other bearing and gear options for this axle are on our rebuild kits page, including the Timken GM 9.5 12-bolt master bearing kit if you only need bearings.
Re-gearing is the right time to add traction. The Eaton Detroit Truetrac for the GM 9.5 and the Yukon Dura Grip for the 2014-up 9.5 both drop in while the carrier is out. A bearing separator and puller set makes pulling the old carrier and pinion bearings far easier.
| Brand | Yukon Gear & Axle |
| Part number | YGK2250 |
| Fits | Yukon Gear 9.5in GM 4.11 Rear Ring & Pinion Install Kit Axle Bearings and Seals |
| Type | Differential Install Kits |
| 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. This kit is for the 12-bolt-cover GM 9.5 used from 2014 on. The older semi-float 9.5 has a 14-bolt cover and needs different gears and bearings.
The ring gear size is cast into the housing near the pinion. The 9.76 was used mainly with the 6.2L. Read the casting or send us the year, engine and VIN before ordering.
Yukon designed this kit for carriers built for 3.42 and higher ratios. If your truck came with a lower ratio, the carrier may not accept the 4.11 gear set and a different carrier is needed.
Gear oil, a way to measure backlash and preload (dial indicator and inch-pound torque wrench), and a bearing puller. Axle bearings and seals are already included.
Yes. The speedometer and transmission shift points use the axle ratio and tire size, so update them with a programmer or at a dealer after the install.
