Whats the difference

[Caman96]

Sent you your Build Sheet. I would ignore anything ebay says about your truck.

 

[GoToGuy]

What about it didn't match? I have medium duty service manuals. If you use that class of vehicle it specs much different, Air brakes , instead of hydraulic, an etc.
As " some other" said that's your correct vin breakdown.

 

[618 Syndicate]

It's a 93 gmt400. And may also be a 93 Cheyenne 3500.
More than one thing can be true at once.