Yukon Gear & Axle YG GM8.5-342 Ring & Pinion Gear Set 3.42 for GM 8.5"/8.6" Rear

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Product Specification:

SKU:YUKYG GM8.5-342

MPN: YG GM8.5-342

UPC: 883584241577

Weight: 17.9 lb

Type: Final Drive Gears

Vehicle Fitment

GM 8.5" (216 mm) / 8.6" (218 mm) rear differential housings (10-bolt) equipped on various GM trucks/SUVs.

Fitment Notes

Ring gear diameter: 8.5" / 8.6" - confirm your rear axle size before installation.
Gear ratio: 3.42:1 - ensure your current drivetrain ratio, tire size and use case match.
30-spline pinion and 10 ring-gear bolts configuration required for correct fitment.
Not compatible with GM 9.5" or 9.76" rear ends unless specified - verify housing diameter and bolt pattern.

Features

High-performance ring & pinion gear set engineered for strength and durability.
Heat-treated alloy steel construction for long-term reliability under high loads.
Precision-machined gear teeth for smooth engagement and minimized noise.
Optimized for GM 8.5"/8.6" 10-bolt rear axles - supports upgraded tire sizes, towing, heavy duty use.
Matched ring & pinion set ensures proper mesh and alignment out of the box.
Suitable for performance upgrades or rebuilds when factory gears are inadequate.
Backed by Yukon's manufacturing quality and aftermarket credibility.
Installation ready for professional use in trucks/SUVs with 8.5"/8.6" rear ends.

Specifications

Gear ratio: 3.42:1
Ring gear diameter: 8.50" / 8.6" (216 mm / 218 mm)
Pinion spline count: 30 splines
Ring gear bolt count: 10 bolts
Position: Rear axle (10-bolt GM 8.5"/8.6" differential)
Drive type: RWD/4WD compatible, depending on vehicle axle configuration
Material: Heat-treated alloy steel
Manufacturer part number: YG GM8.5-342

Included Components

1x Ring & Pinion gear set (3.42:1 ratio) for GM 8.5"/8.6" rear axle
Note: Additional bearings, seals, shims or install hardware may be required depending on your axle condition.

Product Description

The Yukon Gear & Axle YG GM8.5-342 is a premium performance ring and pinion gear set designed for GM 8.5"/8.6" 10-bolt rear differential housings. With a 3.42:1 final drive ratio, this gear set is purpose-built for trucks and SUVs that need stronger gearing for larger tires, towing or heavier duty workloads.

Manufactured from heat-treated alloy steel and precision machined to tight tolerances, the ring & pinion deliver robust durability and smooth operation under demanding driving conditions. The matched gear set ensures proper mesh and alignment right out of the box, making it an excellent choice for drivetrain upgrades or rebuilds on GM 8.5"/8.6" rear ends.

Before installation, confirm that your vehicle's rear axle is indeed the GM 8.5"/8.6" 10-bolt housing with the correct spline count and gear ratio. Employing proper installation procedures - correct backlash, bearing preload, and ring gear torque - is critical to ensure long-term performance and reliability of the set.