Diversified Machine 4.86MODPKG1 EZ Mod Quick Change Rear End Assembly with GN Tubes, Billet Hubs & Rotors

The Diversified Machine (DMI) 4.86MODPKG1 is a complete EZ Series Mod Quick Change Rear End Assembly built for dirt modified and short track circle track racing. This ready-to-run package includes Grand National (GN) axle tubes, billet hubs, and brake rotors — everything needed to get on track fast.

At the heart of this assembly is the legendary Bulldog Quick Change rear end center featuring a 4.86 ring and pinion ratio and a 10-inch ring gear, set in a lightweight magnesium center housing. The magnesium casting keeps overall weight down while delivering the structural rigidity demanded by competitive modified racing.

EZ Series Side Bells are a signature feature of this package. The EZ design allows axle tube removal and installation in minutes — without removing the rear from the car and without the need for a press. Tubes can be swapped as a complete assembly with brakes, hub, and birdcage pre-mounted, dramatically reducing setup and repair time.

Key Features:

• Complete EZ Series Mod quick change rear end package
• 4.86 ring and pinion gear ratio with 10-inch ring gear
• Lightweight magnesium center housing and bells
• Includes Grand National (GN) axle tubes
• Billet hubs included for superior strength and weight reduction
• Brake rotors included — ready for installation
• EZ Series quick-swap tube design — no press required, no rear removal needed
• O-ringed gear cover with magnetic drain plug and breather assembly
• Heat-treated lower shaft for durability under race conditions
• Made in the USA by Diversified Machine Inc. (DMI)

DMI's Bulldog quick change rear ends have proven themselves at the highest levels of dirt modified and sprint car racing. The 4.86MODPKG1 delivers that same race-proven reliability in a complete, bolt-in-ready package suited for IMCA, UMP, USMTS, and similar modified classes.