Why You’ll Love It
4” Portal Lift adds ground clearance directly at the hubs
15% or 30% Gear Reduction adds torque and relieves drivetrain stress
Selectable Idler Setup lets you choose dual- or single-idler gearing
Cast or Billet Housings let you choose the construction that fits your build
Limited Lifetime Warranty protects your purchase
Dominate Any Terrain in Your Defender HD8 with GDP Portals
Ready to tackle tougher trails? The SuperATV 4” Portal Gear Lift for your Can-Am Defender HD8 adds ground clearance and a built-in gear reduction for more torque and ground clearance. Run larger tires with ease and choose a 15% or a 30% gear reduction depending on how you like to ride. Upgrade from cast to billet aluminum housing for extra strength. For maximum performance, choose SuperATV's dual idler options.
What Is a Dual Idler?
SuperATV has spent years perfecting its dual idler gear portals. Adding a second idler gear spreads the load over more surface area, giving you more reliable torque and a super-strong gear set. But it’s all about fit—so SuperATV precision CNCs grind every gear from 9310 steel for perfect mesh.
An Option for Every Rider
No matter how you ride, GDP Portal Gear Lifts are ready to deliver. Rip across dunes, blast through trails, crawl through mud, or put in work around the property—there’s a portal built for it. Run a 15% gear reduction for speed and fun, or drop down to 30% for max torque and big tire domination. Upgrade to dual idler gears and push your rig harder than ever.
Protect Your Drivetrain
GDP portals shift the gear reduction to the hub, taking stress off the drivetrain where it matters most. As a result, major components—axles, differential, prop shafts, and transmission—are protected from the excessive force required to turn large tires.
Built Tough with Aluminum and Steel
These portals are made to last. With cast and billet aluminum housings and heavy-duty advanced steel alloy backing plates, they’re built to handle whatever you throw at them.
The 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—SuperATV knows because it tested them
Advanced Gaskets, Seals, and Bearings
The 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
Add a Frame Stiffener
Portals and monster tires push your machine to the limit—and your frame feels it. Ensure maximum durability by installing a SuperATV Frame Stiffener along with your new HD8 portals.
Top-Notch Customer Service
Not sure which portals you need? No problem—SuperATV's customer service team is here for you. Call us up and SuperATV will get you dialed in with the perfect set.
4” Portal Gear Lift Includes:
(4) Assembled portal hub boxes complete with 9310 gears, seals, output shaft, gaskets, and thrust bearings.
(4) Universal hubs and stainless steel slotted rotors with lugs
(4) Specialized steel alloy backing plates
(4) Steel caliper mounting plates
(2) Steel steering arms
Extended brake lines
All required hardware, including recessed castle nut socket
Frame stiffener (optional)
Max Tire Size Recommendations for 4” Portal Gear Lift
Max Tire Size
Required Suspension Setup with 4" Portals
26"
Stock
27"
3" Lift Kit
28" to 34"
2" Forward Offset A-Arms
28" to 38"
6" Lift Kit
If you need help figuring out which gear reduction is right for you, check out SuperATV's portal gear reduction calculator .
Max tire sizes are measured at full compression and full turn. The given tires sizes are the largest SuperATV fits without rubbing. With minor trimming or a small amount of rub, larger tire sizes can be used.
Patent # 11,299,042
Patent # 11,318,787
Frequently Asked Questions (FAQ)
Is a 4-inch portal gear lift better than a standard lift kit for a Can-Am Defender 4?
Yes. A 4-inch portal gear lift gives you both ground clearance and torque—not just height like a standard lift kit. By moving the gear reduction to the hub, portals reduce stress on axles, differentials, and the transmission while allowing you to run larger tires with confidence.
Will this portal gear lift fit my Can-Am Defender 4 or Defender MAX?
This portal gear lift is machine-specific and engineered to fit select Can-Am Defender and Defender MAX models listed in SuperATV's fitment guide. Always check the fitment tab on the product page to confirm compatibility with your exact year and model.
How hard is it to install a SuperATV 4-inch portal gear lift?
Installing portals is more involved than a basic lift because they replace the hubs and integrate gear reduction. SuperATV includes detailed step-by-step instructions, extended brake lines, and all required hardware to make installation as straightforward as possible for experienced DIY riders.
What gear reduction options are available and how do I choose one?
SuperATV offers 15% and 30% gear reduction options. A 15% reduction maintains higher trail speed with added torque, while 30% is ideal for heavy loads, mud riding, or turning larger tires that require more low-end power.
How much wider does the Defender get with this portal gear lift installed?
This 4-inch portal gear lift increases width by approximately 4 inches per side, giving your Defender a wider, more stable stance. The added width improves control when running larger tires or navigating uneven terrain.
What makes SuperATV GDP portals stronger than other portal lifts?
GDP portals use precision-ground 9310 alloy steel gears and offer a dual idler configuration that spreads load across more surface area. This engineering delivers smoother operation and maximum strength under extreme torque, backed by years of real-world testing.
Do I need special wheels or backspacing for this portal gear lift?
Yes. Wheels must be at least 14 inches in diameter and cannot exceed 4.5 inches of backspacing. Following these requirements ensures proper clearance, correct steering geometry, and long-term reliability of the portal system.
Features
Available with billet or cast aluminum housing
Dual idler gear configuration maximizes strength
Cool, quiet, precision ground gears made from 9310 alloy billet steel
1.5 in. diameter 4340 hardened steel drive shaft
Housings use advanced gaskets or O-rings that don’t let anything through
Universal hubs can be set up to work with the following bolt patterns: 4/156, 4/137, 4/115, and 4/110
Gear reduction reduces stress on your drivetrain
Dual idler gear configuration adds a 3/4” front and rear offset—1.5” total extension
Lighter than the competition
Fitment information
Can-Am Defender HD 8 : 2016-2021
Can-Am Defender HD 8 DPS : 2016-2021
Can-Am Defender HD 8 XT : 2016-2021
Can-Am Defender MAX HD 8 : 2017-2021
Can-Am Defender MAX HD 8 DPS : 2017-2021
Can-Am Defender MAX HD 8 XT : 2017-2021
Wheel Requirements:
14” or larger wheel required
Wheels cannot exceed 4-1/2” backspacing
Not compatible with dual beadlock wheels
Wheels need to have a center hole of at least 3.25" (82.55mm) or require a 1” wheel spacer
