Bulletproof Front Differential Re-Build – Polaris RZR 900 (2012–2013)
Eliminate OEM Weak Points – Upgrade to Bulletproof Reliability
The Bulletproof Front Differential Re-Build for 2012–2013 Polaris RZR 900 replaces every failure-prone plastic OEM component with billet aluminum and 4130 Chromoly steel upgrades, engineered for extreme off-road performance and longevity.
This rebuild package includes a billet torsion spring retainer, 6-tooth billet sprague cage, 6-tooth 4130 Chromoly cage plate, and upgraded bearings & high heat-rated seals. Designed for heavy abuse, it improves bearing tolerances, eliminates drivetrain slop, and restores dependable 4WD operation.
Key Features
- Full OEM Plastic Replacement – Billet and Chromoly internals for maximum durability
- Precision Machining – Custom shims for accurate ring & pinion gear lash
- Upgraded Bearings & Seals – Withstand heat, load, and contamination
- 4WD Fix – Resolves engagement and disengagement issues
- Pro Re-Build Service – Certified tech installation with bench load testing included
Vehicle Fitment
- 2012 Polaris RZR 900
- 2013 Polaris RZR 900
Important Notes
- Customer ships diff to SandCraft for rebuild service
- Includes 2 oz Justice Bros gear oil treatment—top off with diff oil before riding
- Return shipping included after rebuild completion
Why Upgrade?
If your RZR 900 struggles with 4WD engagement, stays stuck in 4WD, or produces excessive noise, this Bulletproof rebuild is your long-term solution. Built with billet and Chromoly parts, it’s the ultimate fix for riders who demand strength, precision, and reliability in their drivetrain.
