14
Shock Springs
Stiffer springs will give you better handling and higher cornering speed on smooth surfaces such as
asphalt, concrete, and hard pack dirt. Soft springs are better for rougher terrain, rock crawling and jumping.
Softer springs will increase the rollover tendency of the truck at higher speeds.
Optional Gearing
Additional gearing is available for your MTA-4 Monster Truck. Additional gearing allows you to match
your engine and transmission to your driving situation. Bigger gears on the clutch bell (or smaller slipper
gears) will result in greater top speed, but will have slower acceleration from a stop (see chart below).
If you change the gearing you will need to reset the gear mesh:
1. Loosen (or tighten if engine was removed) the four engine mounting bolts located on the underside
of the truck until you can just slide the engine forward and backward.
2. Slide the engine up to the spur gear until the teeth on the clutch bell are meshed tightly with the teeth
on the slipper gear.
3. Move the engine back a little bit (1/32" or 0.8mm). Check the mesh by holding the smaller gear with
one hand and rocking the bigger gear back and forth with the other. The big gear should rock back
and forth slightly with little effort. A gear mesh that is too tight will be noisy, have lower performance
and could ruin the gears.
Part Number Spring Color Spring Rate Relative Stiffness
PD1473 Blue(Std) 4.40 lb./in Softest
PD1474 Gold 5.10 lb./in
PD1475 Red 5.95 lb./in
PD1476 Copper 6.90 lb./in Stiffest
Clutch bell gear Slipper Gear Final Reduction Final Reduction
size size 1st Gear 2nd gear
(15 is Std.) (52 is Std.)
52 PD1456 30.17 20.87
14T 49 PD1754 28.46 19.68
PD1523 46 PD1755 26.75* 18.50*
52 28.22 19.51
15T 49 26.59 18.39
PD0470 46 24.97 17.27
52 26.43 18.28
16T 49 24.88 17.21
PD1751 46 23.42 16.20
52 24.88 17.21
17T 49 23.42 16.20
PD1752 46 22.04 15.24
52* 23.42* 16.20*
18T 49 22.04 15.24
PD1753 46 20.82 14.40
Better
Acceleration
Higher Top
Speed
* Some gear combinations may require modification of the spur gear support guard. Look for equivalent
ratios to avoid making modifications. For example, instead of using the 18-52 combination, choose
either of the 17-49 or 16-46 combos.
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