Peterbilt Window Regulator R21-6009 R21-6011

The R21-6011 is the Left-Hand (Driver Side) electric power window regulator used in a wide range of Peterbilt heavy-duty trucks. While the previously discussed R21-6012 is specific to the Peterbilt 335, the R21-6011 is a more universal part for Peterbilt's vocational and highway models.

• Part Number: R21-6011 (LH / Driver Side).

• Application: Fits Peterbilt models 357, 365, 367, 378, 379, 388, and 389.

• Type: Electric power window regulator (includes the regulator frame; motors are often sold as an assembly).

• Orientation: Driver Side / Left Side.

• Material: Typically features a silver metal frame with durable plastic gear construction. 

• Key Features & Compatibility

• OEM Reference: Direct replacement for Peterbilt/Paccar OEM part numbers R21-6011 and R21-6009.

• Cross-References:

• Dorman: 741-5401.

• Automann: HLK2281.

• Paccar Parts: WNR021000L.

• Peterbilt 379: 1987 – 2007.

• Peterbilt 389: 2008 – 2023.

• Peterbilt 357/378: 1987 – 2007.

Quality and Testing

TinzerMotor produces these window regulators and window motors with a focus on long-term high quality and mechanical reliability:

Heavy-Duty Construction: Uses thickened steel plate components and reinforced pivot points to prevent the "sagging" or jamming common in lower-quality aftermarket parts.

Extensive Testing: Each unit undergoes rigorous cycle testing, involving thousands of manual rotations under simulated glass weight to ensure the internal gears do not strip or slip over time.

Precision Fit: Designed to align perfectly with the original door mounting holes, ensuring a "bolt-on" installation without the need for drilling or modification.

Please contact: 

Ms Riva  

Wechat/WhatsApp +86 15355970956 

Email: riva@ruishuoautoparts.com

Alibaba Shop linkage:

Peterbilt Window Regulator R21-6009 R21-6011