Yukon ZK GM11.5-B Master Overhaul Kit for 2011-2018 Chevy/GMC/Ram 11.5" Diff

Vehicle Fitment

• 2011-2018 Chevrolet Silverado 2500/3500 HD (Duramax & Gas, RWD/4WD, 30-spline GM 11.5" AAM)
• 2011-2018 GMC Sierra 2500/3500 HD (Duramax & Gas, RWD/4WD)
• 2011-2018 Ram 2500/3500 (Gas & Cummins, RWD/4WD, Daimler-built AAM 11.5")

Features

• USA Standard™ full master overhaul kit with OEM-grade Timken/Koyo bearings & races
• Includes crush sleeve & complete shim set for precise pinion depth/backlash setup
• Carrier & pinion tight-fit bearings optimized for mid-2011+ 4.125" race GM design :contentReference[oaicite:1]{index=1}
• Pinion seal, pinion nut, and thread locker for proper preload
• Ring gear bolts with thread locker to GM torque spec
• Marking compound with brush for gear pattern visualization
• Silicone gasket (sealed cover) & oil slinger/baffle to maintain lubrication
• 50-state compliant, emissions-legal rebuild kit - no emissions modifications required

Specifications

• Fits 11.5" AAM ring gear housing with 30-spline axle shafts
• Pinion rear race O.D.: 4.125" (mid-2011+ design) :contentReference[oaicite:2]{index=2}
• Bearing preload: crush sleeve per GM spec (~20-30 in-lb)
• Backlash adjustment via shims: 0.003"-0.010"
• Ring gear bolt torque: 175 ft-lb; carrier cap bolts: 153 ft-lb
• Pinion seal compatible with synthetic and mineral gear oil
• Kit weight: ~12 lb; dimensions: 12"x13"x3" packaging :contentReference[oaicite:3]{index=3}

Included Components

• 2x carrier bearings & races
• 1x pinion bearing & race
• 1x crush sleeve
• 1x pinion nut
• Pinion seal & 2x axle seals
• Complete shim set (carrier + pinion shims)
• Ring gear bolts (qty per OEM)
• 1x sealing gasket or silicone
• 1x marking compound tube + brush
• 1x thread locker tube
• 1x oil slinger/baffle

Product Description

The Yukon ZK GM11.5-B Master Overhaul Kit is engineered for complete differential rebuilds of 11.5" AAM rear ends from mid-2011 to 2018-model Chevy, GMC, and Ram HD trucks and vans. It matches the 4.125" pinion race design and includes high-quality Timken/Koyo bearings, crush sleeve, shims, seals, and installation hardware needed for exact GM-spec rebuilds. This rebuild kit is ideal for Duramax diesel or gas HD owners aiming to restore drivetrain reliability after high-mileage use or when upgrading gear ratios or installing limited-slip carriers.

Perfect for professional shops or experienced DIY enthusiasts, the kit enables precise gear setup with shim-adjusted backlash (0.003-0.010") and correct pinion preload. Ring gear bolts and thread locker ensure long-term stability. Including silicone gasket and oil baffle prevents leaks, and the kit maintains factory-style emissions compliance. Installation requires a hydraulic press, dial indicator, torque wrench, and gear-pattern tools. The kit supports all axle splines and gear ratios offered in 30-spline AAM 11.5" configurations.

Installation note: Confirm pinion race diameter before ordering (this kit fits 4.125" versions). Always replace the crush sleeve during rebuild to achieve proper preload. Compatible with OEM gear ratios and limited-slip/carrier options, and includes all hardware required for a full teardown and rebuild. Emissions impacts: none - factory configuration retained.