Quick answer

Start with the VS4-10 Builders Kit - Straight Axle if you want a VFD transmission and F10 straight axles in one box. Choose the VS4-10 Ultra or Phoenix instead when you want the Currie F10 portal axle platform, where the Currie Portal Overdrive Gear Set (20/28) is a stock replacement rather than an experiment. Pick the VRD1 cage platform only if you are building around the Phoenix body and bumper ecosystem. The deciding factor is axle type and transmission family, not the body.

Currie Portal Overdrive Gear Set (20/28)

Currie Portal Overdrive Gear Set (20/28)

Vanquish sells several crawler platforms that share a brand but not a parts bin. The VS4-10 family splits into straight-axle and portal-axle builds, and the VRD1 cage sits on its own body-mount and bumper hardware. That means the right question is not which kit is best, but which one your local terrain and your parts drawer already support.

This comparison sticks to what the catalog actually states: drivetrain layout, axle design, and which replacement parts fit which kit. Where a specification is not published, treat that as a decision you need to confirm before ordering rather than assuming compatibility.

Drivetrain and axle layout: the real fork in the road

The VS4-10 Builders Kit - Straight Axle pairs the Vanquish Products VFD transmission with F10 straight axles, joined by ISD10 driveshafts with machined CV-style joints. The molded F10 straight axles use a high-clearance design that shrinks the pumpkin and adds strength around the C-hub and knuckle. That combination favors builds where you want the axle housing to slide over rock edges without hanging up.

Portal builds take the opposite approach. The Currie F9 and F10 portal axles carry a 1.67:1 gear ratio as delivered, with the Currie Portal Overdrive Gear Set (20/28) dropping that to 1.4:1. Portal boxes add ground clearance at the wheel, but they also add parts and adjustment points. Neither layout is universally better; they simply fail in different places on the trail.

  • Straight axles: fewer moving parts, simpler to service, less clearance under the diff.
  • Portal axles: more clearance at the wheel, more gear interfaces to maintain.

Where each platform's parts actually fit

Fit is where platform comparisons get practical. The VFD Light Weight Aluminum Motorplate fits VPS09003 and VPS09004 Pro Kits and the VPS10152 VFD Transmission Kit, so it crosses between straight-axle and portal VS4-10 builds that use that transmission. The VFD Sintered Gear Set is narrower: it is a replacement set for the VPS10152 VFD Transmission Kit only.

On the portal side, the Currie Portal Overdrive Gear Set (20/28) is listed for Vanquish Products SCX10-II Portal, VS4-10 Ultra, and VS4-10 Phoenix F10 portal axles, and it is the stock replacement for the VS4-10 Ultra and VS4-10 Phoenix (VPS09007) kits. The VRD1 Rear Cage Parts are a separate ecosystem entirely, built for VPS10184 body mounts, the Phoenix body, and VPS10181 bumpers and sliders.

  • Check the kit number, not just the model name, before ordering a drivetrain part.
  • Cage, body, and bumper hardware rarely crosses between VS4-10 and VRD1 builds.

How the VS4-10 buying decision changes with terrain

If your local trails are loose, steep, and full of ledge steps, the overdrive option on portal axles is the meaningful lever. Vanquish lists the 20/28 gear set as helping with steep climbs and turning radius, and it can be run in the front axle only or in both axles. Front-only keeps the rear wheels driven at the stock ratio, which changes how the truck pulls under throttle.

If your terrain is technical, low-speed rock with tight lines, a straight-axle VS4-10 keeps the driveline simple and the parts count low. You give up wheel-level clearance and the overdrive tuning option, and you gain a shorter list of things to check when the truck starts making noise.

  • Run overdrive front-only for a noticeable steering and climbing change without altering rear axle behavior.
  • Confirm whether your kit already ships with the overdrive set before buying it twice.

Electronics and body choices are not the deciding factor

Lighting and body hardware are easy to swap later, so do not let them drive the platform choice. The Incision Series 3 Light Kit is designed for the VS4-10 Phoenix, the VS4-10 Origin Classic, and its included molded front inner fenders, with molded front light buckets, a heatsink LED, red tail lights, and white front and rear inner fender rock lights. It fits those bodies specifically, not every Vanquish rig.

The same logic applies to the VRD1 Rear Cage Parts, which exist to support the VRD1 body mount and Phoenix body combination. If your build plan starts with a body you already own, work backward to the platform that supports it rather than forward from a kit sale.

  • Buy lighting and cage parts after the platform is settled, not before.
  • A light kit that fits one Vanquish body may not fit another without modification.

Trade-offs to weigh before you order

  • Straight axle vs portal axle: The VS4-10 Builders Kit - Straight Axle uses F10 straight axles with a high-clearance molded housing; portal builds use Currie F9 and F10 axles with a 1.67:1 ratio and an available 1.4:1 overdrive set. Choose straight axles for simplicity and portal axles for wheel-level clearance and overdrive tuning.
  • Overdrive as a stock part vs an upgrade: The Currie Portal Overdrive Gear Set (20/28) is the stock replacement for the VS4-10 Ultra and VS4-10 Phoenix (VPS09007) kits, but on other portal axles it is a change you make yourself. Verify what your kit ships with before buying a gear set you may already have.
  • Shared drivetrain parts vs platform-specific body parts: The VFD Light Weight Aluminum Motorplate fits VPS09003, VPS09004, and the VPS10152 VFD Transmission Kit, while the Incision Series 3 Light Kit is designed for the VS4-10 Phoenix and Origin Classic bodies. Drivetrain parts travel between builds; body and lighting parts usually do not.

Catalog facts that affect your choice

  • VS4-10 Builders Kit - Straight Axle: Features the Vanquish Products VFD transmission and F10 straight axles, connected by ISD10 driveshafts with machined CV-style joints; the molded F10 straight axles use a high-clearance design that minimizes the pumpkin and maximizes strength around the C-hub and knuckle. This is the simplest VS4-10 entry point and the one to pick if you want a single-box drivetrain without portal gear maintenance.
  • Currie Portal Overdrive Gear Set (20/28): A 1.4:1 gear ratio versus the 1.67:1 ratio included in the portal axles; suggested for the front axle only, or front and rear; stock replacement for the VS4-10 Ultra and VS4-10 Phoenix (VPS09007) kits. If you run a portal VS4-10, this is the tuning part that changes climbing and turning behavior, and it is a direct replacement rather than a custom fit.
  • VFD Light Weight Aluminum Motorplate: Machined from 6061 aluminum, clear anodized, with additional material removed to reduce weight; fits VPS09003 and VPS09004 Pro Kits and the VPS10152 VFD Transmission Kit. It crosses between VFD-equipped VS4-10 builds, so it stays useful if you later change axle type but keep the transmission.
  • VRD1 Rear Cage Parts: Replacement VRD1 rear cage parts for use with VPS10184 VRD1 Body Mount set, Phoenix Body, and VPS10181 Phoenix bumpers and slider set; the complete VRD1 cage set is VPS10182. These confirm the VRD1 cage is its own platform with its own body and bumper hardware, not a bolt-on for a VS4-10 chassis.

Which Vanquish platform fits you

Best for

  • Buyers who want a VFD transmission and F10 straight axles in one kit with fewer drivetrain parts to maintain
  • Drivers on technical low-speed rock who value a simple, easy-to-inspect driveline
  • Builders who already own VS4-10-compatible drivetrain parts and want to reuse them

Not for

  • Drivers who need maximum clearance at the wheel and want the portal overdrive tuning option
  • Builders planning around the VRD1 cage, Phoenix body, and VPS10184 body mount hardware
  • Buyers who want a body-specific light kit like the Incision Series 3 without checking body compatibility first

Decide on axle type and transmission family first, then let body, lighting, and cage parts follow. If you want a straightforward VFD and straight-axle build, the VS4-10 Builders Kit - Straight Axle is the clean starting point. If you want portal clearance and the option to run the 1.4:1 overdrive, build around the VS4-10 Ultra or Phoenix and confirm which parts your kit already includes before you add anything.