Motive Gear TAC488 Differential Ring and Pinion Toyota 8.4" 4.88 Ratio

The Motive Gear TAC488 is a precision-engineered differential ring and pinion gear set designed for the Toyota 8.4" differential at a 4.88:1 gear ratio. Purpose-built for drivers who demand reliable drivetrain performance on the street, trail, or track, this gear set is an ideal upgrade for those running larger tires or seeking improved torque multiplication.

Key Specifications:

• Gear Ratio: 4.88:1
• Ring Gear Diameter: 8.125 in.
• Ring Gear Teeth: 39
• Pinion Gear Teeth: 8
• Pinion Shaft Diameter: 1.570 in.
• Pinion Spline Count: 30
• Ring Gear Bolts: 12
• Material: 8620 forged steel
• Sold as: Set (ring and pinion)
• Installation kit: Not included

Key Features:

• Forged from 8620 steel for exceptional wear resistance and internal toughness
• Engineered to meet or exceed OEM specifications for precise fit and reliable performance
• Manufactured using state-of-the-art processes and verified through in-house quality control for strength, tolerance, and hardness
• Proven in competition — Motive Gear products appear in the winner's circle at NHRA, IHRA, SODA, SCORE, and NASCAR events
• Backed by a 1-year / 50,000-mile limited warranty against material and manufacturing defects

Re-gearing with the TAC488 restores drivetrain efficiency when running larger-than-stock tires, helping recover lost throttle response and fuel economy. Professional installation is recommended for best results.