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Fifth Wheel to Gooseneck Adapter that Fits Fabex 520 Pin Box  

Updated 06/09/2025 | Published 06/04/2025

Question:

I have the same pin box as Vince C..fabex 520 I need to convert it to a gooseneck. What do you have for this job?

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Expert Reply:

Hey William, for a Fabex 520 pin box the correct fifth wheel to gooseneck adapter would be the Shocker Hitch part # SHK55MR. This is a really nice cushioned adapter that will work great and also give you a nice and smooth ride quality.

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Jameson C
Wm W. profile picture

Wm W.

6/5/2025

Thank you for the information and a speedy response. I'm not sure it would fit my ranch style under bed gooseneck ball plate. Would the universal ranch style adapter work. You see I found out today. The previous owner welded the pin box mounting bolts to the pin box.

Jameson C. profile picture
Etrailer Expert

Jameson C.

6/5/2025

@WmW Yes, the Ranch hitch part # AM3100 would work attached to your Fabex 520. Sorry to hear the pin box was welded as that would make this a bit more difficult. In future if you need to replace the pin box you'd have to cut the plates off of the frame and have new ones welded on.
Wm W. profile picture

Wm W.

6/5/2025

@JamesonC Thank you for your assistance!
Jameson C. profile picture
Etrailer Expert

Jameson C.

6/9/2025

@WmW Glad to help!

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