Yukon Gear & Axle YGK141 GM 8.5in Rear 3.42 Ratio Ring & Pinion with Master Install Kit and Dura Grip Limited Slip Posi 30 Spline

The Yukon Gear & Axle YGK141 is a comprehensive re-gearing package for the GM 8.5-inch rear differential, combining a 3.42 ratio ring and pinion gear set, a master installation kit, and the Yukon Dura Grip limited slip positraction unit with 30-spline axle compatibility. Everything needed to complete a full differential rebuild or ratio change is included in one convenient bundle.

Ring & Pinion Gear Set:

• GM 8.5-inch rear axle application
• 3.42 gear ratio
• Manufactured from premium-grade alloy steel with precision heat treatment to OEM specifications
• Engineered for quiet operation and high-torque durability

Master Installation Kit Includes:

• Carrier bearings and races
• Pinion bearings and races
• Pinion seal and axle seals
• Complete shim kit
• Ring gear bolts and pinion nut
• Crush sleeve, thread locker, and marking compound with brush
• Gasket and silicone (where applicable)

Yukon Dura Grip Limited Slip Positraction (30 Spline):

• Provides smooth yet aggressive traction to both driven wheels across a wide range of terrains
• 4-spring, Raybestos composite clutch-style design
• High-strength nodular iron case for maximum durability
• Internal spider gears machined from forged 4320 chromoly steel for stronger teeth
• Fully rebuildable design — repair or modify without replacing the entire unit
• Assembled in the USA
• Compatible with 2.73 ratio and numerically higher gear ratios
• Designed for GM 8.5-inch and 8.6-inch differentials with 30-spline axles

Important Notes:

• Use of high-grade non-synthetic GL-5 gear oil is required; synthetic oil is not recommended and may cause aggressive or noisy operation
• Yukon LSD additive (part number OILADD) is recommended for long life and smooth operation
• Carrier bearing part numbers: LM102949 & LM102911 for 8.5-inch housing; LM603049 & LM603012 for GM 8.6-inch housing
• Some 2007 and newer applications may require minor case clearancing

The Yukon Gear & Axle YGK141 delivers a complete, one-stop solution for re-gearing the GM 8.5-inch rear differential. Whether upgrading for larger tires, added towing capacity, or improved off-road traction, this all-inclusive package simplifies the installation process with thoroughly tested, precision-fit components.