Traxxas Revo 3.3 Owner's Manual page 41

The following gear ratio chart shows the available combinations with
optional spur gears, clutch bells, and two-speed gear sets.
Gear Ratio Chart
With 14T Clutch Bell # of Spur Gear Teeth
2nd gear sets Gear
17T/39T 1st 24.21
(Standard)
2nd 16.79
16T/40T 1st 24.21
(Close)
2nd 18.30
18T/38T 1st 24.21
(Wide)
2nd 15.45
With 15T Clutch Bell
# of Spur Gear Teeth
(standard)
2nd gear sets Gear
17T/39T 1st 22.59
(Standard)
2nd 15.67
16T/40T 1st 22.59
(Close)
2nd 17.08
18T/38T 1st 22.59
(Wide)
2nd 14.42
With 16T Clutch Bell
# of Spur Gear Teeth
2nd gear sets Gear
17T/39T 1st 21.18
(Standard)
2nd 14.69
16T/40T 1st 21.18
(Close)
2nd 16.01
18T/38T 1st 21.18
(Wide)
2nd 13.52
With 17T Clutch Bell # of Spur Gear Teeth
2nd gear sets Gear
17T/39T 1st 19.94
(Standard)
2nd 13.83
16T/40T 1st 19.94
(Close)
2nd 15.07
18T/38T 1st 19.94
(Wide)
2nd 12.72
*stock configuration out of the box
Tuning The Sealed Gear Differentials
Revo's front and rear gear differentials allow the left and right wheels to
spin at different speeds while turning so that the tires do not scuff or skid.
This decreases the turning radius and increases steering performance.
The performance of the differentials can be tuned for different driving
conditions and performance requirements. The differentials are filled
with silicone differential fluid, and are sealed to maintain consistent
long-term performance. Changing the oil in the differential with either
lower or higher viscosity oil will vary the performance characteristics of
the differentials. Changing to a higher viscosity oil in the differential will
reduce the tendency for engine power to be transferred to the wheel
with the least traction. You may notice this when making sharp turns
on slick surfaces. The unloaded wheels on the inside of the turn have
the least traction and tend to spin up to extremely high rpms. Higher
viscosity (thicker) oil causes the differential to act like a limited-slip
differential, distributing more equal power to the left and right wheels.
36 38 40
Revo will generally benefit from higher viscosity oil when climbing, rock
25.55 26.90
crawling, or racing on low traction surfaces. Note: Heavier oil will allow
17.72 18.66
25.55 26.90 power to be transferred even with one or more tires off the ground. This
19.31 20.33
can make the vehicle more likely to overturn.
25.55* 26.90
From the factory, both the differentials are filled with SAE 30,000W viscosity
16.31* 17.17
silicone oil. Only use silicone oil in the differentials. Traxxas sells SAE 10,000W
and SAE 50,000W viscosity oil (see your parts list). The differentials have to be
36 38 40
removed from the vehicle and disassembled to change/replace oil.
23.85 25.10
16.54 17.41
Installing the Long Travel Rockers
23.85 25.10
Use the exploded views included with the model to aid in the installation
18.03 18.97
23.85 25.10
process. All of the rockers have labels identifying their proper location;
15.22 16.02
RF (right front), LF (left front), RR (right rear), and LR (left rear). Note: The
exhaust system must be removed to access the rear rocker arms.
36 38 40
1. Remove shock absorbers
22.36 23.54
Remove the screws that secure the shocks to the chassis shock mounts,
15.51 16.32
22.36 23.54 and to the rocker arms.
16.90 17.79
2. Install Long Travel shock springs
22.36 23.54
Replace all four of the 90mm travel shock springs with the four 120mm
14.27 15.02
Long Travel shock springs. The front shock springs are indicated by a
36 38 40 silver dot, and the rear shock springs are indicated by a blue dot.
21.04 22.15
3. Install Long Travel rockers
14.60 15.36
Replace the 90mm travel rockers with the Long Travel rockers by
21.04 22.15
15.90 16.74 removing the four 4x6 buttonhead cap screws from the rocker pivot
21.04 22.15
posts. Remove the 5x11 ball bearings from the rockers. Install the same
13.43 14.14
5x11 ball bearings in the Long Travel rockers. Secure the Long Travel
rockers to the pivots with the same 4x6 buttonhead cap screws.
4. Remove the blue spacers before installing the push rods
The blue spacers must be removed from all four of the suspension push
rods. Install the push rods into the middle position (marked LT) on the
lower suspension arms.
5. Reinstall shock absorbers
Reinstall all four shock absorbers back into their respective locations.
1-888-TRAXXAS
ADVANCED TUNING ADJUSTMENTS
If you have questions or need technical assistance, call Traxxas at
(1-888-872-9927) (U.S. residents only)
Use higher viscosity
(thicker) oil for:
• More power to the wheels
with the most traction.
• Racing on low-traction
smooth surfaces .
• Better performance for
climbing on uneven terrain.
Using lower viscosity
(thinner) oil for:
• More power to the wheels
with least traction.
• Racing on low-traction
rough surfaces.
REVO 3.3 • 41