Take your Arrma 1/5 performance to the next level with the Cobra Racing TrailBOSS 7075-T6 Aluminum Differential Housing—engineered for hardcore bashers, high-speed senders, and anyone tired of cracking stock plastic housings. Designed to fit either the front or rear, this precision-machined upgrade transforms the durability and driveline strength of your Kraton 8S, Outcast 8S, Mojave 1/5, or any Arrma 1/5 platform using this style diff case.

🔧 What’s Included

• 2-piece 7075-T6 CNC-machined differential housing

• Precision 7075-T6 pinion bearing support plate (prevents bearing movement & keeps gear mesh perfect)

• Full hardware set (steel screws, washers, mounts)

• Ready for front or rear installation

Tip: To upgrade both front and rear differentials, simply add two (2) to your cart.

💥 Why Upgrade Your Arrma 1/5 Diff Housing?

Stock plastic 1/5 housings flex under 8S power, causing:

❌ Bearing walks out under load
❌ Diff ring gear loses mesh
❌ Pinion gear chews teeth
❌ Case warps from heat and impacts
❌ Internal components wear prematurely
❌ High-speed instability
❌ Increased drivetrain noise and vibration

If you push your Arrma—even moderately—these failures are inevitable over time.

✅ How This Cobra Racing Housing Solves Every Issue

Cobra Racing’s 7075-T6 aluminum construction is 2–3x stronger than standard aluminum and dramatically stiffer than plastic. Benefits include:

🔥 Zero Flex
Keeps ring and pinion perfectly aligned under brutal landings, throttle punches, and high-speed runs.

🔥 Longer Gear Life
Perfect, consistent mesh extends the life of your ring gear, pinion, bearings, and shims.

🔥 Cooler Operating Temps
Aluminum dissipates heat, preventing diff fluid breakdown and extending service intervals.

🔥 Pinion Bearing Locked
Aluminum bearing retainer plate keeps pinion bearings secure.

🔥 Bulletproof Durability
Survives jumps, flips, cartwheels, and speed runs.

🔥 Smoother, Quieter Drivetrain
Eliminates gear chatter and howl caused by misalignment.

✅ Compatibility (Full List – All Models & Variations)

ARRMA KRATON 1/5 8S

• Kraton 8S BLX (ARA110002)

• Kraton 8S V2 BLX (ARA110002V2)

• Kraton 8S EXB Roller (ARA5208)

• Kraton 8S EXB RTR (ARA110003)

• All Limited Editions / Special Releases

ARRMA OUTCAST 1/5 8S

• Outcast 8S BLX (ARA110002T2)

• Outcast 8S V2 BLX (ARA110002V2T2)

• Outcast 8S EXB Roller (ARA5210)

• Outcast 8S EXB RTR (ARA110003T2)

• All color variations & limited versions

ARRMA MOJAVE 1/5 EXB / Roller Model

• Mojave 1/5 EXB Roller (ARA5209)

• Mojave 1/5 EXB RTR

• All trims using the large-scale 1/5 diff architecture

ARRMA 1/5 Roller & Custom Builds

• All 1/5-scale rollers using the 1/5 8S diff case

• All custom 1/5 builds using the Arrma 8S drivetrain

• All 1/5 platforms designed for 8S power with Kraton/Outcast style diff geometry

• ALL OTHER ARRMA 1/5 that share the same gearbox

🏆 Who This Upgrade Is For

• Serious bashers

• High-speed speed-run drivers

• Skatepark senders

• Heavy 8S setups

• Anyone tired of replacing cracked diff housings

• Builders who want the strongest possible Arrma driveline

💪 Material: 7075-T6 Aluminum

• Used in aircraft structural components, high-performance racing parts, and premium RC upgrades

• Stronger and stiffer than 6061 aluminum

• Ensures your differential stays solid under extreme abuse

🛠️ Front or Rear Compatible

• Works for front differential or rear differential

• Upgrade both ends? Add 2 to your cart

⭐ Upgrade Once. Enjoy It Forever.

This isn’t just an upgrade—it’s a durability solution. Once installed, your Arrma 1/5 drivetrain becomes:

• Smoother

• Quieter

• Cooler

• Far more capable of handling real 8S punishment

Your diff gears will thank you. Your bearings will thank you. You’ll thank yourself after the first full-throttle pass.