4Runner 1st Gen (9/1985-1989)

• Vehicle Fitment list is down below
• Made from tool-grade 8620 steel and heat-treated for maximum strength and wear resistance.
• The gear teeth are cut using Gleason CNC hobbing machines & cutters. Gleason gear-cutting technology produces an unprecedented level of accuracy and surface finish, which allows the gears to transmit more torque and improve fuel efficiency.
• Higher accuracy and surface finish also produces a quieter-running gear set.
• Gear teeth are cut using the 5-cut process to increase contact area to reduce load distribution and reduce stress on the gear teeth.
• No break-in period.
• Less friction.
• Reduced wear allowing bearings and gears to last longer.
• Treated with REM® Isotropic Super Finishing (ISF) process.
• The REM® Isotropic Super Finishing (ISF) process removes the microscopic peaks in the material and creates a surface on the ring and pinion gears with a roughness of less than 10 µin Ra! This means that there is less friction between the gears, reducing wear by 95% and allowing the gears and bearings to run cooler and last longer.
• Non-directional surface that increases lubricant retention on the gear surface, reducing lubrication requirements.
• Pinion Spline: 29-Spline
• Ring Gear Bolts: 10 bolts (Ring Gear Bolts not included)
• Ring Gear Diameter: 8”
• Ring Gear Rotation (4-Cyl & V6): Standard
• Ring Gear Rotation (Hi-Pinion): Reverse
• Includes forged chromoly 29-spline Quadruple-drilled flange with dust shield, 29-spline Trail-Safe™ Pinion Seal, and 29-spline pinion nut
• Flange is Quadruple drilled with the most popular Pickup/4Runner & Tacoma Patterns:

66mm x 66mm x 11mm (Tacoma)
60mm x 60mm x 10mm (Pickup/4Runner and TG Heavy Duty Driveline)
60mm x 68.3mm x 10mm
61.5mm x 70mm x 10mm

• Dust shield pre-installed onto flange
• High-pinion sets also include a high-pinion oil slinger.

• Vehicle Fitment list is down below
• Made from tool-grade 8620 steel and heat-treated for maximum strength and wear resistance.
• The gear teeth are cut using Gleason CNC hobbing machines & cutters. Gleason gear-cutting technology produces an unprecedented level of accuracy and surface finish, which allows the gears to transmit more torque and improve fuel efficiency.
• Higher accuracy and surface finish also produces a quieter-running gear set.
• Gear teeth are cut using the 5-cut process to increase contact area to reduce load distribution and reduce stress on the gear teeth.
• No break-in period.
• Less friction.
• Reduced wear allowing bearings and gears to last longer.
• Treated with REM® Isotropic Super Finishing (ISF) process.
• The REM® Isotropic Super Finishing (ISF) process removes the microscopic peaks in the material and creates a surface on the ring and pinion gears with a roughness of less than 10 µin Ra! This means that there is less friction between the gears, reducing wear by 95% and allowing the gears and bearings to run cooler and last longer.
• Non-directional surface that increases lubricant retention on the gear surface, reducing lubrication requirements.
• Pinion Spline: 29-Spline
• Ring Gear Bolts: 10 bolts (Ring Gear Bolts not included)
• Ring Gear Diameter: 8”
• Ring Gear Rotation (4-Cyl & V6): Standard
• Ring Gear Rotation (Hi-Pinion): Reverse

• Vehicle Fitment list is down below
• Made from tool-grade 8620 steel and heat-treated for maximum strength and wear resistance.
• The gear teeth are cut using Gleason CNC hobbing machines & cutters. Gleason gear-cutting technology produces an unprecedented level of accuracy and surface finish, which allows the gears to transmit more torque and improve fuel efficiency.
• Higher accuracy and surface finish also produces a quieter-running gear set.
• Gear teeth are cut using the 5-cut process to increase contact area to reduce load distribution and reduce stress on the gear teeth.
• No break-in period.
• Less friction.
• Reduced wear allowing bearings and gears to last longer.
• Treated with REM® Isotropic Super Finishing (ISF) process.
• The REM® Isotropic Super Finishing (ISF) process removes the microscopic peaks in the material and creates a surface on the ring and pinion gears with a roughness of less than 10 µin Ra! This means that there is less friction between the gears, reducing wear by 95% and allowing the gears and bearings to run cooler and last longer.
• Non-directional surface that increases lubricant retention on the gear surface, reducing lubrication requirements.
• Pinion Spline: 29-Spline
• Ring Gear Bolts: 10 bolts (Ring Gear Bolts not included)
• Ring Gear Diameter: 8”
• Ring Gear Rotation (4-Cyl & V6): Standard
• Ring Gear Rotation (Hi-Pinion): Reverse