Shock Springs; Optional Gearing - THUNDER TIGER MTA4 Instruction Manual

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.
Part Number
PD1473
PD1474
PD1475
PD1476

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.
Clutch bell gear
size
(15 is Std.)
14T
PD1523
15T
PD0470
16T
PD1751
17T
PD1752
18T
PD1753
* 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.
Spring Color Spring Rate
Blue(Std) 4.40 lb./in
Gold 5.10 lb./in
Red 5.95 lb./in
Copper 6.90 lb./in
Slipper Gear Final Reduction Final Reduction
size 1st Gear
(52 is Std.)
52 PD1456 30.17
49 PD1754 28.46
46 PD1755 26.75*
52 28.22
49 26.59
46 24.97
52 26.43
49 24.88
46 23.42
52 24.88
49 23.42
46 22.04
52* 23.42*
49 22.04
46 20.82
14
Relative Stiffness
Softest
Stiffest
2nd gear
20.87
19.68
18.50*
19.51
18.39
17.27
Better
18.28
Acceleration
17.21
Higher Top
16.20
Speed
17.21
16.20
15.24
16.20*
15.24
14.40