Front Track Drive Sprocket for Ski-Doo TNT 640 641 771 775 1970-1972

Front Track Drive Sprocket for Ski-Doo TNT 640/641/771/775

This front track drive sprocket is a replacement drivetrain component that transfers engine power to the track on 1970-1972 Ski-Doo TNT 640, 641, 771, and 775 snowmobiles.

Overview

This front track drive sprocket is built to replace a worn or damaged drive sprocket on 1970-1972 Ski-Doo TNT 640, 641, 771, and 775 snowmobiles. The sprocket engages the track's internal drive lugs to deliver consistent power transfer from the drive axle. It is intended for riders and mechanics restoring or maintaining these classic Ski-Doo TNT models.

Built For Performance

• Direct replacement for the original front track drive sprocket on 1970-1972 Ski-Doo TNT 640, 641, 771, and 775
• Tooth profile shaped to mesh cleanly with the track's internal drive lugs
• Rugged construction suited to the torque loads of vintage snowmobile drivetrains
• Designed for mounting on the front drive axle in the factory position
• Provides consistent engagement for reliable track movement

Fits These Machines

• for Ski-Doo TNT 640, 1970-1972
• for Ski-Doo TNT 641, 1970-1972
• for Ski-Doo TNT 771, 1970-1972
• for Ski-Doo TNT 775, 1970-1972

On-The-Job Use

• Replacing a cracked or stripped drive sprocket during track service
• Restoring a vintage Ski-Doo TNT to running condition
• Routine drivetrain maintenance on 1970-1972 TNT models
• Seasonal rebuilds of classic snowmobile tracks and axles

Specs At A Glance

Good To Know

Q: How many sprockets do I need for one drive axle? A: Most snowmobile drive axles use a pair of sprockets, so check your machine before ordering to confirm the quantity required. Inspect both sides for wear since they typically age at the same rate.

Q: Does this sprocket include mounting hardware? A: Hardware is not included unless stated in the listing. Reuse your existing fasteners if they are in good condition, or source replacements separately.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.