Athearn Genesis HO G63839 Motor Retrofit Kit for SD45/SD40

$49.98 $37.99
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Athearn Genesis HO G63839 Motor Retrofit Kit for SD45/SD40
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Current Stock Level: 6


Three benefits to Genesis power to your RTR Locomotives: Streamlined DCC speed curves, lower motor current draw, quieter motor operation for DCC Sound

Use with the DCC-Sound Ready underframe only; models produced after 8/13!

Simple Installation
Molded on motor saddle mounts
Included extended Dog-Bone universal
Included mounting screws
Balanced flywheels
DCC Ready! NMRA 8 pin and Decoder Harness plugs
Pre-soldered motor wire leads

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8 Reviews Hide Reviews Show Reviews

  • 5
    Athearn loco upgrade

    Posted by KC on Nov 18th 2019

    Been updating all my old athearn locos with these motors, makes them run smooth and quiet, however, the blue box frames, as well as the RTR, require machine work to make the motor fit, I have my own harbor freight mill and it works perfectly for this kind of work.

  • 2
    Athearn Genesis motor upgrade for RTR loco

    Posted by Ken on Nov 18th 2019

    I bought the motor to upgrade my SD45T-2 RTR that I recently bought.
    I first found that the DCC ready light board did not mount on the motor adapter. I had to duct tape it. The motor kit includes an adapter drive shaft, but that didn't fit.

  • 5
    Retrofit motors

    Posted by Bobby Hearty on Aug 2nd 2019

    Very well built. Shipping was excellent

  • 5
    Athearn Genesis retrofit motor

    Posted by Keith on Feb 8th 2019

    Have been installing these in every Athearn loco that I own (blue box and RTR, 4 and 6 axle) it does however require that I mill the frame to lower the motor down and sometimes even custom length drivelines. Have also been machining the frames for others in my club, a little work required but it’s worth it to hear an old blue box run as quiet and smooth as any newer loco.

  • 1
    A waste

    Posted by Unknown on Jun 28th 2018

    Nice motor it's no good without the under frame you must order separately do the math $36 retro motor kit additional $30 for separately under frame you must purchase to make it work $ $66 total then time to put it together if you add sound later you might as well breakdown spend$ 250 bucks for DCC sound brand new up to date out the box

  • 5
    great motor, easy change out

    Posted by Unknown on Jun 28th 2018

    Great way to upgrade your RTR motors. Keep in mind, this is very important, these motors are for the newer, upgraded Athearn SD40/45 frames, not the early RTR versions. So if you have the older locos, you will have some milling to do to make them fit.

  • 4
    Nice Re-Power unit

    Posted by JR on Jun 28th 2018

    Works for re-powering RTR locomotives whose motors leave a little to be desired. Keep in mind it does not necessarily drop right into the frame on some or most of the locomotives. One may have to mill out and file some of the frame material depending on which engine you are trying to put this in.

    However, it runs great and the fact that it is paired up with the circuit board is great too.

  • 5
    Motor Refit

    Posted by Graham on Jun 28th 2018

    I brought this motor to replace to motor that was in my BN SD40-2 and I'm so glad I did. It works so much better and runs a lot faster compared to the original.