Yukon YG T100-488 8.125in Ring Pinion 4.88 for Toyota T100/Tacoma Rear

Vehicle Fitment

• Toyota T100 and Tacoma - rear axle, 8.125" ring gear diameter, without factory locking differential

Fitment Notes

• This gear set is for the 8.125" rear differential used on certain T100 and Tacoma configurations; other trims and model years used a smaller 7.5" rear differential instead, which is not interchangeable - confirm your ring gear diameter before ordering
• Fits vehicles WITHOUT a factory locking (locker) rear differential; if your truck has a factory locker, confirm compatibility separately before ordering
• I was not able to confirm precise model years for this specific 8.125" rear differential application from independent sources - verify your exact model year and axle spec with Yukon or by measuring your ring gear before ordering
• Sources show a minor discrepancy on ring gear bolt count (10 vs. 12) across listings for this part - confirm with the seller if this detail matters for your install

Features

• High-performance ring & pinion gear set for the Toyota T100/Tacoma 8.125" rear differential
• 4.88 gear ratio
• 30-spline pinion
• Standard rotation
• Semi-float axle type
• Manufactured by Yukon Gear & Axle to exceed OEM specification
• Designed for quiet, precise operation and straightforward setup

Specifications

• Differential: Toyota T100/Tacoma rear, 8.125"
• Ratio: 4.88
• Pinion spline count: 30
• Ring gear diameter: 8.125"
• Axle type: Semi-float
• Ring gear rotation: Standard

Included Components

• 1x Ring gear
• 1x Pinion gear

Product Description

The Yukon YG T100-488 is a high-performance ring & pinion gear set for the 8.125" rear differential found on certain Toyota T100 and Tacoma trucks without a factory locking rear differential. At a 4.88 ratio, this is an aggressive gear set typically chosen by owners running larger tires who need to restore proper torque, drivability, and throttle response after a lift or tire upgrade.

Built with a 30-spline pinion to match factory specifications, this set is engineered for quiet, precise operation and straightforward setup. Because Toyota fitted these trucks with more than one rear differential size depending on trim and equipment, confirming your exact ring gear diameter - 8.125" for this set, versus the smaller 7.5" used elsewhere in the lineup - is the essential first step before ordering.

This is a gear set only, not a full install kit - it doesn't include the carrier bearings, pinion bearings, shims, or seals needed to complete a gear swap. Pair it with an appropriate master overhaul or bearing install kit for your specific application. Installation requires differential disassembly and proper backlash and pinion depth setup, so it's best handled by an experienced DIY installer or a differential shop.