Zumbrota Drivetrain RMTMA5-1 Remanufactured Manual Transmission - AR5 5-Speed 4WD

The Zumbrota Drivetrain RMTMA5-1 is a fully remanufactured Aisin AR5 5-speed manual transmission engineered for 4WD applications. Built to exacting OEM standards, this replacement transmission restores factory-level shifting performance and drivetrain reliability. The AR5 (GM RPO code MA5) is a fully synchronized, heavy-duty gearbox manufactured by Aisin, featuring a robust aluminum case and roller/needle bearing gear train support throughout.

Zumbrota remanufactures each transmission using a rigorous 3-step inspection process to ensure every unit meets or exceeds original factory specifications before leaving the facility:

• Step 1 – Pre-Inspection: Each core is thoroughly examined for case cracks, excessive wear, and OEM-specific problem areas before any rebuilding begins
• Step 2 – Component Measurement: All internal parts are precisely measured to confirm compliance with OEM tolerances and specifications
• Step 3 – Assembly Quality Control: Shaft straightness, gear wear, and synchronizers are extensively tested to meet OEM specs; all seals are replaced
• Dyno-Tested: Every completed unit is dyno-tested for proper operation, shiftability, and noise level before shipment
• Exclusive Hydro-Blast Cleaning: An exclusive hydro-blast rinse and sandblasting procedure on all internal and external parts is followed by a proprietary shot-enticed deep cleaning process

The AR5 is a fully synchronized 5-speed transmission with an overdrive 5th gear. It features a 26-spline input shaft and 27-spline output shaft, with all gear train components supported by needle bearings and shafts supported by roller ball bearings. The transmission carries a rated torque capacity of 260 lb-ft (350 Nm). Gear ratios for the Colorado/Canyon application are: 1st: 3.75 | 2nd: 2.26 | 3rd: 1.37 | 4th: 1.00 | 5th: 0.73.

Transmission Identification Notes: AR5 | Asian Built | Front and Rear Cases with Center Plate | ID: 24236573 | GM RPO: MA5 | Hollander Number: 400-04425 | ID Codes: GBTT, GBTW, GBXS, GCCH, GCCJ

This unit is backed by Zumbrota Drivetrain's 2-Year Unlimited Mileage Limited Warranty for 3/4-ton and lighter applications. A refundable core charge applies — return your original unit upon installation to receive your core deposit back.