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The following gear ratio chart shows the available combinations with
optional spur gears, clutch bells, and two-speed gear sets.
With 14T Clutch Bell
2nd gear sets
Gear
1st
17T/39T
(Standard)
2nd
1st
16T/40T
(Close)
2nd
1st
18T/38T
(Wide)
2nd
With 15T Clutch Bell
(Standard)
2nd gear sets
Gear
1st
17T/39T
(Standard)
2nd
1st
16T/40T
(Close)
2nd
1st
18T/38T
(Wide)
2nd
With 16T Clutch Bell
2nd gear sets
Gear
1st
17T/39T
(Standard)
2nd
1st
16T/40T
(Close)
2nd
1st
18T/38T
(Wide)
2nd
With 17T Clutch Bell
2nd gear sets
Gear
1st
17T/39T
(Standard)
2nd
1st
16T/40T
(Close)
2nd
1st
18T/38T
(Wide)
2nd
*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
# of Spur Gear Teeth
wheels on the inside of the turn have the least traction and tend to spin up
36
38
40
to extremely high rpms. Higher viscosity (thicker) oil causes the differential to
24.21
25.55
26.90
act like a limited-slip differential, distributing more equal power to the left
16.79
17.72
18.66
24.21
25.55
26.90
and right wheels. Revo will generally benefit from higher viscosity oil when
18.30
19.31
20.33
climbing, rock crawling, or racing on low traction surfaces.
24.21
25.55
26.90
Note: Heavier oil will allow power to be transferred even with one or more
15.45
16.31
17.17
tires off the ground. This can make the vehicle more likely to overturn.
# of Spur Gear Teeth
From the factory, both the differentials are filled with SAE 30,000W viscosity
36
38
40
silicone oil. Only use silicone oil in the differentials. Traxxas sells SAE 10,000W
22.59
23.85
25.10
and SAE 50,000W viscosity oil (see your parts list). The differentials have to be
15.67
16.54
17.41
22.59
23.85
25.10
removed from the vehicle and disassembled to change/replace oil.
17.08
18.03
18.97
22.59
23.85*
25.10
Installing the Long Travel Rockers
14.42
15.22*
16.02
Use the exploded views included with the model to aid in the installation
# of Spur Gear Teeth
process. All of the rockers have labels identifying their proper location; RF
36
38
40
(right front), LF (left front), RR (right rear), and LR (left rear). Note: The
21.18
22.36
23.54
exhaust system must be removed to access the rear rocker arms.
14.69
15.51
16.32
23.54
21.18
22.36
1. Remove shock absorbers
16.01
16.90
17.79
Remove the screws that secure the shocks to the chassis shock mounts,
21.18
22.36
23.54
and to the rocker arms.
13.52
14.27
15.02
2. Install long travel shock springs
# of Spur Gear Teeth
Replace all four of the 90mm travel shock springs with the four 120mm
40
36
38
long travel shock springs. The front shock springs are indicated by a silver
19.94
21.04
22.15
13.83
14.60
15.36
dot, and the rear shock springs are indicated by a blue dot.
19.94
21.04
22.15
3. Install long travel rockers
15.07
15.90
16.74
19.94
21.04
22.15
Replace the 90mm travel rockers with the long travel rockers by removing
12.72
13.43
14.14
the four 4x6 buttonhead cap screws from the rocker pivot posts. Remove
the 5x11 ball bearings from the rockers. Install the same 5x11 ball bearings
in the long travel rockers. Secure the long travel rockers to the pivots with
the same 4x6 buttonhead cap screws.
4. Locate push rods
Make sure that all four of the suspension push rods are located
and secured 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.
Advanced Tuning Adjustments
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 • 45
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