These couplers are designed to work with OEM and Trail-Gear input gear splines. High-strength splined couplers are made from heat-treated and carburized SCM415 alloy steel. Trail-Gear couplers may not work with other manufacturer's aftermarket gears. 21-Spline or 23-Spline couplers are available. These gears fit RF1A transfer cases.
Details:

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