Zumbrota Drivetrain RTC226G-1 Remanufactured Transfer Case Electric Shift - NP226 27-Spline

The Zumbrota Drivetrain RTC226G-1 is a remanufactured NP226 (NV226) transfer case designed for 2002–2009 GM SUVs including the Chevrolet Trailblazer, GMC Envoy, and several related platforms. Featuring a 27-spline input shaft, electric shift (E-Shift) operation, slip yoke style rear output shaft, and external spline front output, this unit is a direct-fit replacement for the OEM transfer case.

The transfer case is the critical drivetrain component that splits engine power between the front and rear axles when 4WD is engaged. Using a chain-drive system, the NP226 routes torque from the rear driveshaft circuit to the front driveshaft and differential, enabling four-wheel drive capability. This unit is a two-speed transfer case operating under GM option code NP8.

Remanufacturing Process:

• Complete disassembly, deep cleaning, and thorough inspection prior to rebuild
• Pre-inspection checks for case cracks, excessive wear, and known OEM-related issues
• Mid-process inspection to verify all component parts meet OEM specifications
• Final post-build quality control sign-off by a certified rebuild technician
• Proprietary cleaning process restores all cases to OEM-like finish

Key Specifications:

• Transfer Case Model: NP226 / NV226
• Input Spline Count: 27-Spline
• Shift Type: Electric Shift (E-Shift)
• Rear Output: Slip Yoke Style
• Front Output: External Spline
• Speeds: Two-Speed
• GM Option Code: NP8
• OEM Tag Numbers: 12577425, 12580320, 12580321, 12585314, 12585316, 12588508, 15155589, 15762810, 24228408, 24236607, 24238837, 24242114, 24242561
• Hollander Number: 41

This remanufactured transfer case arrives cleaned and inspected, built to meet or exceed original equipment specifications for a reliable, like-new installation.