ZipZap® Monster Truck Gears

Links show Upgrade Kits where gear sets are available.
image color and
geartrain ratio
 part number and description
green, stock
transfer = 8 / 32 teeth
axle = 42 teeth
ZZ MT 7-tooth pinion = 23.99:1
ZZ 6-tooth pinion = 27.98:1
stock gear in all ZipZap Monster trucks
red, performance
transfer = 9 / 32 teeth
axle = 41 teeth
ZZ MT 7-tooth pinion = 20.85:1
ZZ 6-tooth pinion = 24.28:1
60-7546, Performance Booster Upgrade Kit
yellow, turbo
transfer = 10 / 32 teeth
axle = 40 teeth
ZZ MT 7-tooth pinion = 18.28:1
ZZ 6-tooth pinion = 21.32:1
orange, racing
transfer = 11 / 32 teeth
axle = 39 teeth
ZZ MT 7-tooth pinion = 16.22:1
ZZ 6-tooth pinion = 18.92:1
 
Gear ratios assume the rear wheel gear of the same color as the transfer gear listed above.  Geartrain ratios are shown for both 6- and 7-tooth motor pinion gears.
 
The original ZZ MT 7-tooth motor pinion gear may be replaced with a 6-tooth motor pinion gear from a ZZ car.  Enlarge the gear with a no. 62 drill (0.038-in dia), then press-fit on the MT motor shaft.
 
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