Nitro gears are manufactured from 8620 steel gear forgings in the same manufacturing facilities as GM, Dodge, Ford and Toyota. They are precision machined using computer controlled processes, heat treated, CNC triple-lapped and Rockwell tested for hardness. These extra steps ensure excellent fitment, ideal contact pattern and smooth, quiet operation.
Features:

• Toyota 8 Inch IFS Reverse Clamshell 4.88 Ratio Nitro Ring and Pinion
• Differential: Toyota 8 Inch Reverse, Clamshell IFS
• Gear Ratio: 4.88 (Fits 3. 91 and Up Case)
• Tooth Count: 39/8
• Pinion Splines: 29
• Ring Gear Bolts: 10 (not included)
• Warranty: 2 Years