Driveshaft Shop 1200HP Rear Axle Bar/CV Upgrade – BMW M4 (F80/F82/F83)

OVERVIEW

The rear axle bar and inner CV upgrade for the 2014+ F80-F83 M3/M4. The Driveshaft Shop developed a set of 300M axle bars along with chromoly inner and outer CV internal components. Using proprietary 1.25″ diameter high-grade 300M bars (stock axle bars are 28 spline), a custom chromoly CV cage and race set, these axles become practically indestructible. The factory outer CV housing is made from a very strong material, so this upgrade is more than enough to handle the 1200 HP rating offered.

This is a send-in service on your own factory axles. DSS tempers and shot-peens the OEM outer and inner housings, installs factory-style metal boot covers on the outer CV (double o-ring sealed), and installs the new chromoly cage/race internals along with 30-spline bars.

SPECS

• Proprietary 1.25″ diameter high-grade 300M axle bars
• 30-spline bars (stock axle bars are 28 spline)
• Custom chromoly CV cage and race set
• Chromoly inner and outer CV internal components
• Factory outer CV housings retained, tempered and shot-peened
• Factory-style metal boot covers on the outer CV, double o-ring sealed
• Rated to 1200 HP
• Warranty: 1 year (The Driveshaft Shop)
• Built to order on your cores — call for current lead times

PARTS INCLUDED

• Upgrade service only: 300M axle bars, chromoly inner/outer CV internals, cage and race set and metal boot covers installed into your supplied OEM axle housings. Your factory axles are required as cores.

TECH RESOURCES

Additional Parts Required

• Your factory OEM axles. This is an upgrade-only service — you must send in your own axles for DSS to assemble the set.
• RMA number. Call for lead times and an RMA number before shipping your axles in.
• Single-use axle nuts and any damaged OEM boots or hardware should be replaced at reassembly.
• Professional installation is recommended.

Installation

• The Driveshaft Shop does not publish a downloadable installation guide for this upgrade. Contact Speed Logic or The Driveshaft Shop directly for RMA, lead time and torque guidance.

Notes

• **You must send in your axles to have this process done, please call for lead times and an RMA number before sending them in.**
• Upgrade service only — no new axle housings are supplied. Confirm model year fitment and current lead times with Speed Logic before ordering.

PART NUMBER

• M4R1
• DSS SKU: 510415

VEHICLE APPLICATIONS