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OK, you found one. The set in your picture is,
Performance Booster Upgrade Kit. 600-7521, containing,
Stock speed motor (Green - 16,000 rpm)
Turbo speed motor (Yellow - 23,500 rpm)
Racing speed motor (Orange - 28,000 rpm)
Extra motor clip with set screw
Transfer gear set (Blue - 18T:6T, Green - 18T:7T, Red - 18T:8T)
Rear axle/gear set (Blue - 24T, Green - 23T, Red - 22T)
You can either use one of the above motors as is or VERY CAREFULLY pull the pinion gear off one of the motors and slip it onto the RED BASE - 21,500 rpm motor that came with your Transformers car. My suggestion is that you switch motors and don’t mess with the gears. Too easy to screw up.
Other gear/motor sets sometimes available on eBay, Etc. that would work are,
Speed and Performance Booster Kit. 600-7551
Turbo speed motor (Yellow - 23,500 rpm)
Racing speed motor (Orange - 28,000 rpm)
Nitrous Express motor (Purple - 34,000 rpm)
Extra motor clip with set screw
Transfer gear set (Blue - 18T:6T, Green - 18T:7T, Red - 18T:8T)
Rear axle/gear set (Blue - 24T, Green - 23T, Red - 22T)
And
Performance Booster Upgrade Kit. 60-7501
Precision Control Motor (Blue - 10,000 rpm)
Turbo Speed Motor (Red - 21,500 rpm)
Extra Motor Clip with Set Screw
Suspension Bars (3 Tensions)
Transfer gear set (Blue - 18T:6T, Green - 18T:7T, Red - 18T:8T)
Rear axle/gear set (Blue - 24T, Green - 23T, Red - 22T)
I don't believe that the pinion gear for the Monster Truck ZipZaps (your original picture) will work on any of the ZipZaps cars.
Lawyer words - All of the above information is subject to change without notice.
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