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Does anyone know what this is? It's located under the ecm
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I think VSS.. :unsure:

Please tell us more about the vehicle ( Year, Make, Model ) and list all mods
(y)
 

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Ok is right.
It looks like the DRAC/ VSSB module. It runs the speedometer.
The other side should have a sticker on it with 3 big letters. Telling what series it is.
 

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Ya it splits and converts the speed sensor signals to everything that needs it. Kinda strange that they were using em so late on our trucks. Most things by that time ran off the main ECU. Its also where you can calibrate the speedo if you changed rear end or tire size. I'm not sure if they still do it but there used to be places that would recalibrate them for you or sell you one that had switches on it so a only slightly above average person could calibrate them on their own.
 
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