Currie F9/F10 Portal Rear Inner Axle Shafts Upgrade Guide
By Vanquish Products - Premium RC Crawler Kits & Accessories | Published: 2026-10-29
Category: Buying Guides
Learn when and why to upgrade to Currie F9/F10 portal rear inner axle shafts for your RC crawler, with fitment rules and trade-offs.
Quick answer
Upgrade to Currie F9/F10 portal rear inner axle shafts when you need stronger chromoly steel replacement stubs for VS4-10 Ultra or Currie F9/F10 portal axles. They are not compatible with Axial Capra axles.
Why upgrade to chromoly steel shafts?
The Currie F9/F10 portal rear inner axle shafts are machined from high-quality chromoly steel, offering increased strength over stock shafts. This is especially useful for heavy rigs, high-torque brushless motors, or aggressive crawling where standard shafts may twist or snap.
However, the upgrade only makes sense if you already run a compatible portal axle setup. If you are on a stock VS4-10 or similar axle without portals, these shafts won't fit.
Compatibility limits you need to know
These shafts are designed as replacement stubs for VPS08360, VPS08361, and VS4-10 Ultra portal axles. They are not for use with Axial Capra axles—Capra rear axle shafts are a different part (VPS08083).
If you are upgrading a Capra, look for the correct Capra-specific shafts instead. Mixing them will result in improper engagement and potential drivetrain damage.
Decision rules for upgrading
- Check your axle type first: These shafts fit only Currie F9/F10 portal axles used in VPS08360, VPS08361, and VS4-10 Ultra. If you have a different portal axle, verify compatibility before purchasing. Measure your stub shaft length and spline count to confirm fitment.
- Not for Axial Capra: Capra rear axle shafts are a separate part (VPS08083). Do not use these shafts in a Capra; they will not engage correctly.
- Consider your driving style: If you run a heavy rig or high-torque motor and have had stock shafts fail, upgrading to chromoly steel is a worthwhile investment. For light or casual crawling, stock shafts may suffice. Assess your current failure rate before deciding.
Product facts
- Currie F9/F10 Portal Rear Inner Axle Shafts: Currie F9/F10 Portal Rear Inner Axle Shafts are machined from high quality chromoly steel and are replacement stub shafts for VPS08360, VPS08361 and VS4-10 Ultra. Chromoly steel offers better durability than standard steel, reducing the risk of bending or breaking under heavy loads during technical crawling.
Currie F9/F10 Portal Rear Inner Axle Shafts
Who should upgrade?
Best for
- Owners of VS4-10 Ultra or Currie F9/F10 portal axles who need stronger replacement stubs
- Crawlers running heavy rigs or high-torque brushless motors
Not for
- Axial Capra owners (use VPS08083 instead)
- Builds on non-portal axles or stock VS4-10 without portal conversion
