2009-11 Kenworth T660 T800 W900 Window Regulator Dorman 741-5403 - DMWRG00021



  • Brand New Dorman Power Window Regulator
  • Fits LH (Driver Side) FRONT
  • Power operation
  • Replaces dealer part number: R21-1005, R211005
  • Includes Power Window Motor
  • Direct replacement
  • Built to strict quality control standards
  • Fits models with Daylight Doors only
NOTE: There are different design regulators available for these models. Please compare the original dealer part number listed above to ensure the correct fit.

This window regulator makes a great replacement and has good cost savings over a dealer purchased unit.

Please Note: This window regulator is a high quality aftermarket part that meets or exceeds the performance of the original.  It has been subjected to extensive testing and quality control standards.  That is why we offer this regulator with our superior warranty!


  • This repair is easier than you may think. You'll find our installation videos helpful. In our experience removing and replacing the door panel is the most involved step in the repair. On most vehicles this only requires removing a few screws and push-in clips.
  • You'll get a great feeling of accomplishment after you complete this repair knowing you saved money, and you didn't have to give up your car for a day at the repair shop. Your passengers and other drivers will be amazed.

Fit guaranteed

  • 1A Auto will refund you with no hassle, if this window regulator does not fit the application stated.
    •  This regulator will install just as your original does. Save time and money.


  • Be confident this part will work right. Every regulator is tested after assembly to make sure all mechanisms are working correctly.
  • It is important that your new regulator works for a long period of time. The design of this regulator is tested to withstand 10,000 cycles. That is enough to raise and lower your window 3 times per day for 9 years.


  • Windows that don't work can be frustrating. They can also hurt your vehicles value. An inoperable window could mean $200-$500 discounted off a dealer trade value or asking price.
  • Some shops and dealers charge more for parts and repairs when they think you don't know what is involved. Now you can get the value you deserve. Knowing what this repair entails can be the difference between the value of doing it yourself, or the pain of a costly repair bill.

Part Details

  • Operation: Power
  • Regulator Option: with Motor

Lifetime Warranty

This item is backed by a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser.

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Vehicle Fit

  • 2009-2011 Kenworth T660 with Daylight Doors Front Power Window Regulator with Motor Driver Side Dorman 741-5403
  • 2009-2011 Kenworth T800 with Daylight Doors Front Power Window Regulator with Motor Driver Side Dorman 741-5403
  • 2009-2011 Kenworth W900 with Daylight Doors Front Power Window Regulator with Motor Driver Side Dorman 741-5403

This part replaces:

  • OE # R211005
  • Dorman 741-5403
Part #: DMWRG00021

Order must be placed by 4pm ET
Brand #: 741-5403