The RCV Big Bell 40/47 Spline CV Axle Set is the ultimate drivetrain solution for extreme custom builds running Rockwell or custom Dana 80 axles. Built around RCVs massive 2.5 ton Rockwell Big Bell CVs, this setup is designed for applications where traditional axle technology simply isnt enough.

These axles use Rockwell length 47-spline stub shafts paired with custom length 40 spline inner shafts, built to order based on your exact measurements. With no tire size limit and no horsepower limit, this system is engineered for the most demanding rock crawling, rock bouncing, and competition environments.

Each set is made to ordersimply submit your measurements, add to cart, and we will handle the rest.

Includes:

• (2) Big Bell CV assemblies with 47-spline Rockwell length stub shafts
• (2) Custom length 40-spline 4340 inner axle shafts
• Lifetime Warranty against breakage

Specifications

• CV Type: Big Bell 2.5 Ton Rockwell CV
• Stub Shaft Spline Count: 47-spline
• Inner Shaft Spline Count: 40-spline
• Inner Shaft Material: 4340 Chromoly
• Application Type: Custom / Heavy-Duty Off-Road
• Tire Size Limit: None
• Horsepower Limit: None
• Manufacturing: Made to order inner shafts

Fitment

• Rockwell axle builds
• Custom Dana 80 axle builds
• Custom heavy duty front or rear axle applications

Tech Insight

RCVs Big Bell CVs are derived from 2.5 ton Rockwell military grade architecture, offering unmatched strength, smooth power delivery, and extreme operating angles. Unlike U-joint or traditional CV designs, Big Bell CVs eliminate binding under load, reduce shock loading, and dramatically increase drivetrain longevity in high horsepower and high traction scenarios.

This 40/47 spline configuration is ideal for builders who want the strength of Rockwell components while retaining flexibility with custom axle housings and dimensions.