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Old 07-04-2009, 05:49 PM   #2
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Join Date: Sep 2005
Posts: 367

Dash 3 standards generally imply computer controls. There is no way to tell the difference though, as SD40-3s are upgrades done after the fact - all of these units came from the factory as either SD40s or SD40-2s, and thus they won't look any different externally. Many roads show the model designation on the side of the cab, however (usually right below the number), so that's one way to tell. Otherwise just look it up on the internet after the fact.
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