These gears allow you to replace the input gear in your 4.70 transfer case gear set or install your gear box in a case with a different input. Trail-Gear's 21-Spine and 23-Spline input gears are made from heat-treated and carburized SCM415 alloy steel. These gears fit RF1A transfer cases.
Details:

• Replacement 4.70 Input Gear
• High-strength gears made from heat-treated and carburized SCM415 alloy steel
• 21 Spline
• Sold As: Each