The Originator of the Encapsulated Roller Clutch and 911 Response Clutch Kit

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Thundershift Kit and Heavy Hitter Kit

Thundershift Kit and Heavy Hitters by Fett Brothers Performance and Thunder Products.


The Thunder Shift weight arms give you a full range of adjustability to get the most precise clutching available. The old way to adjust clutch weights was to start with heavy weight arms, and grind them to get them to work properly. This method was hit-and-miss, and grinding too much meant buying a new weight arm and starting over.

The Thunder Shift makes the whole process simple and easy and dials in the clutching to produce more power to the track! No other weight arm on the market produces the same kind of fine tuning ability or the same adjustability as the Thunder Shift.

Available to fit any make or model of snowmobile. Call us for specific fitments and prices.

Thundershift starting at $89.99
Heavy Hitters starting at $199.99
TRA Thundershift starting at $279.99
 

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