Abstract: A dynamometer for a snowmobile includes a pair of driver wheels which replace the tension idler wheels so as to contact the inside of the snowmobile track. The regular snowmobile tension idler wheels are removed, and the driver wheels are positioned on the idler wheel axle. In the alternative, the dynamometer is attached to the existing tension idler wheels by a coupling plate. In the alternative embodiment, the tension idler wheels are configured for power take off by including pins forming a quick connect coupling mechanism. The quick connect coupling mechanism permits the dynamometer to be connected to the snowmobile without having to remove and replace the tension idler wheels with a different pair of driver wheels. A jack is provided to lift the snowmobile track clear of the ground by applying a lifting force between the ground and the tension idler wheel axle. The dynamometer and jack are integrated so as to share common components.