GDP Portals Give You Unmatched Performance
SuperATV’s GDP 4” Portal Gear Lift for the Yamaha Viking gives you power and performance. Choose from 15% or 30% gear reductions and cast or billet aluminum housings so you can optimize for the kind of riding that you actually do. You can get a 30% gear reduction for big tires and challenging rides or a punchy 15% gear reduction for fast trails. Plus, you can upgrade to a stronger portal by opting for our dual idler configuration. Whatever you choose, GDP’s Yamaha Viking portals will give you industry-leading performance on every ride.

What Is a Dual Idler®?
Perfection takes time. After years of research and development, we’ve made our dual idler gear portals unlike any other. By placing a second idler gear in the portal box, the load gets spread over twice as much surface area for more reliable torque transfer and the strongest gear set you can get. Two idler gears don’t do a thing if they’re not mated perfectly, though. Precision CNC grinding ensures ours do. Our gears are made from the industry’s toughest 9310 steel alloy. Didn’t think dual idlers mattered? With GDP’s quality and experience, they finally do.

Perfect for All Kinds of Rides
Whether you like rocks, trails, mud, or doing a good day’s work, a Yamaha Viking portal gear lift makes it better. A 30% gear reduction gives you plenty of punchy torque to turn big tires through mud or over rocks. A 15% gear reduction still boosts your torque a ton while preserving your top-end speed for trails and road riding. No matter what you’re doing, there’s a GDP Portal setup that can help.

A Gear Reduction That Protects Your Drivetrain
Because our Yamaha Viking Portals put the gear reduction directly in the hub, your entire drivetrain benefits. Your axles, differential, drive shaft, and transmission all work less and wear less with a portal gear lift. You can put the pedal down and have a blast without wrecking your ride.

Stronger Yamaha Viking Portals by Design
We dare you to find portals stronger than GDP. Our housings are well researched and long tested. And you get a choice—go with cast or USA-made, CNC-machined 6061 billet aluminum. They’re supported by beefy backing plates made of an advanced steel alloy you won’t find in any other portal system. For robust, trail-proven strength, GDP is the only choice.
Our housings are reinforced for gear retention and optimized for oil flow
Advanced steel alloy backing plates are stronger than chromoly
Enhance with Portal Blood—gear oil formulated for GDP Portals
There are no gimmicks and no vents because vents do more harm than good—we know because we tested them

Advanced Gaskets, Seals, and Bearings
Our portals use:
Advanced gaskets and O-rings with excellent oil resistance and low deterioration rates
A sealed input gear and double-lipped output seal
100% sealing coverage throughout so you can forget about oil leaks
Double-angular contact output bearings to prevent premature wear
Roller idler and drive bearings to maintain perfect gear meshing

Complete the Package with a Frame Stiffener
Yamaha Viking portals and monster tires are fun, but they can place additional stress on your machine’s frame. To make your suspension bulletproof, don’t forget to add a SuperATV Frame Stiffener when you check out!

Top-Rated Customer Service
Still need a little help getting exactly what you need? We’ve got a dedicated team just for portal support. Give us a call so we can get the perfect set of portals in your hands today.
 
Patent # 11,299,042

Patent # 11,318,787

WARNING: This product can impact machine operation. Customer and/or user is responsible for ensuring that this product is compatible with their machine as currently configured, properly installed, and understands any impact this product has or might have on the machine's operation.

⚠ California Proposition 65 Warning ⚠
WARNING: This product may contain a chemical known to the State of California to cause cancer or birth defects or other reproductive harm.