Next step is this, if it is the same as the Chevy trucks, look on the top of the frame rail right next to the steering box. You may have to clean it off a little. The #'s are stamped into the frame and should match your VIN. If not, you may have had a frame swap.
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72 3/4 4x4 350 4spd
72 3/4 4x4 350 auto
2004 Duramax Silverado 4x4
2006 Duramax Crew cab 4x4
2010 Harley Ultra Limited
2011 Harley Street Glide
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