BW1370 & BW4401 Transfer Case ’89-’93 GM K3500 | 2-Prong, 4″ Bell F Yoke, R S/Y

GM K3500 Transfer Case Zumbrota Drivetrain has built a strong reputation for delivering high-quality remanufactured transfer cases. As vehicle technology continues to evolve, we have refined our manufacturing processes to ensure superior performance and reliability. Our customers trust us for our commitment to vision, quality, and dependability—and we stand by that promise.

High-Quality Remanufacturing Process

GM K3500 Transfer Case To ensure top quality and reliability, all our transfer cases are carefully remanufactured to meet high standards. Whether you’re reselling or installing, you can trust their performance and durability.

Stringent Quality Inspections

• Each unit undergoes three thorough inspections during the remanufacturing process.
• Pre-Inspection: Ensures the unit is free of case cracks, excessive wear, and common OEM-related issues found in many cores.
• Mid-Process Inspection: Confirms all component parts meet OEM specifications.
• Final Post-Build Inspection: Verifies the unit adheres to our strict quality standards.
  • Throughout the process, all units are meticulously inspected to maintain our high-quality benchmark.

Advanced Cleaning & Component Replacement

• 100% replacement of seals, bearings, viscous couplers (when applicable), and other common wear components.

• Cases are cleaned using rinse technology, restoring them to an OEM-like finish.

Warranty Coverage to GM K3500 Transfer Case

• Every transfer case is backed by our standard 2-year/unlimited mileage warranty long-term reliability and performance.

Product Details: GM K3500 Transfer Case

• Model: BW1370/BW4401
• Front Output Yoke: 4-Inch Bell Style
• Rear Output Shaft: Slip Yoke Style
• Shift Indicator: Prong Shift Indicator Switch
• PTO Opening: Yes
• Tag Numbers:  15607553,  15659498,  15696735,  15965653
• Hollander Number: 412-275
• Other Reference Numbers: UMT118-1

Compatible Models

• 1993 Chevrolet K3500 (BW1370/BW4401)
• 1993 GMC K3500 (BW1370/BW4401)