Note: overdrive in front or underdrive in rear will pull you faster in the front, it allows you to climb better and reduce rollover.

How to calculate the ratio?
16T/12T=1.33
16T/13T=1.23
16T/14T=1.14

2T/12T, Increase speed approx 33%
2T/13T,Increase speed approx 23%
2T/14T,Increase speed approx 14%
2T/16T,Same as original factory data, replaces factory part
2T/18T,Decrease speed approx 11%


Features:
Upgrade hardened steel material
Overdrive and underdrive gears are optional
The front and rear differentials each house a worm screw and worm gear setup to get the power to the axles and create higher ground clearance
Suitable Model: 
AXIAL 1/30 SCX30 Ford Bronco 4X4 RTR Brushed Rock Crawler（AXI-2048）
AXIAL 1/30 SCX30 Jeep Wrangler JLU 4X4 RTR Brushed Rock Crawler（AXI-2261）
AXIAL 1/30 SCX30 Chevrolet K10 4X4 RTR Brushed Rock Crawler（AXI-2260）



Specifications:
Material: Steel
Overdrive Gears: 2/12T 2/13T 2/14T
Underdrive Gears: 2/18T
Stock Gears: 2/16T


Package includes:(Optional)
1 Set/2 Set x Ring Gear & Worm Gear