Description

This ring gear (3903309) is engineered for Cummins 6B and 4B engines to deliver accurate starter motor engagement and dependable engine starts. Manufactured to OEM specifications, it provides a perfect fit and long service life. Made from high-strength, wear-resistant materials, it supports reliable performance in commercial vehicles, agricultural equipment, and industrial applications requiring consistent starting system function. Application : AK3921263 Aftermarket Cummins B Series Flywheel 5.9 L, B-Series Cross Reference Numbers: 3921264 4933458 3901395 Flywheel Bolt 3900269 Flywheel Bolt Washer Key Features: OEM-quality replacement Smooth and consistent starter engagement Designed for Cummins 6B/4B engines Durable and wear-resistant construction Easy installation with precise fitment Compatibility: Specifically compatible with Cummins 6B and 4B engines. Confirm engine specifications before purchase.