• Get all the horsepower to the ground, fast & easy, no guesswork

• You can't buy a better clutch kit for any amount of money!

The Thunder Shift has routinely survived spin tests exceeding the RPM and stress limits of any clutch on the market without a single failure. Our testing as well as tests by leading magazines and tuners prove that where weight is placed has a dramatic effect of performance. TS offers many weight combinations while being easy to tune to perfection. Gain two to five sled lengths. It works!!

TS fits: Arctic Cat, Polaris, & Comet clutches; Quad Cam clutches Yamaha YXR clutches; and Ski-Doo TRA clutches. 

TESTIMONIALS

Dave Trygstad:  "Thunder Shift Arms are one of the most valuable clutching components you can get!"  
Trygstad Motorsports - Rochester, MN

Glen Kafka:  "Thunder Shift Arms are a must for fine tuning with a multitude of adjustments."
Advanced Clutching - Stratford, WI

Guy Parquette:  "The Thunder Shift Arms sure made it a lot easier to go fast!"
Parquette Racing - Mosinee, WI

Jamie Bellman:  "The Thunder Shift Arms are the most user friendly clutching components I have ever seen."
Bellman Racing - Bremen, IN

John Wheelock:  "The Thunder Shift Arms make the TRA clutch a lot more tunable and consistant."
Pro Line Chassis - Pine Island, MN

Bill Cudney:  “The Thunder Shift Arms are the best bolt on product I’ve ever seen!”
Cudney Racing – Blenheim , ON Canada

Dave Wahl:  “The Heavy Hitter works!”
Wahl Brothers Racing – Greenbush , MN

Kurt Anderson:  “We like the range of adjustability that the Thunder Shift products offer.”
The Crank Shop – Essex Junction, VT

Dale Fett:  “We use Heavy Hitters in all our clutch kits because they get the power to the track!”
Fett Brothers Performance – Frazee , MN

Greg Goodwin:  “The Heavy Hitters adjustability and consistency is unsurpassed.”
Goodwin Performance – Zion , IL

Randy Baker:  “Simply the best tunable weights in the industry!”
RB Specialties – Alexandria , MN

Gary Drum: “The Heavy Hitters work every time, all the time!”
Maxximum Performance – Cohocton , NY

Shane Zeppelin:  “Without a doubt, the Heavy Hitters are the best weights in the industry.”
Maximum Sled Magazine

Dale Cormican:  “The Heavy Hitters are the best working weights I have ever seen.”
C & A Pro - Mentor, MN

Jeff Meidinger:  “The only adjustable weight that allows you to control the whole shift pattern.”
Dakota Performance – Wishek , ND

Duane Watt: “No other weight even comes close!”
Hi-Tech Performance – Litchfield , MN

Jeff Simons:  “The Heavy Hitters are hands down the best weight we have tested!”
Simons C.P.R. - Richfield, WI

Tommy Hill:  “Without the Thunder Shift weights, we just couldn’t go this fast!”
World’s Fastest & Quickest ATV
1/4 mile 8.79 sec. (154 mph)
1/8 mile 5.1 sec (124 mph)  

Jim Jolliffe:  “Great products with tech support to match!”
Micro Belmont - Grand Rapids, MI