Can-Am Defender HD8 4" Portal Gear Lift
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INSTALLATION INSTRUCTIONS
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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
Ready to tackle tougher trails? The SuperATV 4” Portal Gear Lift for your Can-Am Defender HD8 gives you 6 inches of lift 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 our dual idler options.
What Is a Dual Idler?
We’ve spent years perfecting our 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 we precision CNC 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.
- 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
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—our customer service team is here for you. Call us up and we’ll 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 our portal gear reduction calculator . | Max tire sizes are measured at full compression and full turn. The given tires sizes are the largest we fit 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)
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.
This portal gear lift is machine-specific and engineered to fit select Can-Am Defender and Defender MAX models listed in our fitment guide. Always check the fitment tab on the product page to confirm compatibility with your exact year and model.
Installing portals is more involved than a basic lift because they replace the hubs and integrate gear reduction. We include detailed step-by-step instructions, extended brake lines, and all required hardware to make installation as straightforward as possible for experienced DIY riders.
We offer 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.
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.
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.
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.
- 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
- 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
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
Ready to tackle tougher trails? The SuperATV 4” Portal Gear Lift for your Can-Am Defender HD8 gives you 6 inches of lift 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 our dual idler options.
What Is a Dual Idler?
We’ve spent years perfecting our 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 we precision CNC 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.
- 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
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—our customer service team is here for you. Call us up and we’ll 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 our portal gear reduction calculator . | Max tire sizes are measured at full compression and full turn. The given tires sizes are the largest we fit 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)
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.
This portal gear lift is machine-specific and engineered to fit select Can-Am Defender and Defender MAX models listed in our fitment guide. Always check the fitment tab on the product page to confirm compatibility with your exact year and model.
Installing portals is more involved than a basic lift because they replace the hubs and integrate gear reduction. We include detailed step-by-step instructions, extended brake lines, and all required hardware to make installation as straightforward as possible for experienced DIY riders.
We offer 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.
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.
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.
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.
- 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
- 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
Warranty & Returns
SuperATV offers premium products and extends one of the industry's best warranties to go with them. Each GDP Portal Gear Lift carries a Limited Lifetime warranty against manufacturing defects to the original purchaser, for the period and subject to the terms stated on our Warranty Policy page.
For complete warranty details see our Warranty Policy page.