2012 GMC Sierra 3500 HD equipped with 6.6L V8 Diesel OHV Turbo, 6.0L V8 Gas OHV, 6.0L V8 Flex OHV
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REF TSB 12-04-21-001A FOR DES STORY BEFORE ORDERING)(FOR 1ST DES SEE 19259038 FRT HALF 2-SPD MAN SHFT ALUM TRANSFER CASE(NQG) 2nd Design 4WD
2012 GMC Sierra 3500 HD equipped with 6.6L V8 Diesel OHV Turbo, 6.0L V8 Gas OHV, 6.0L V8 Flex OHV
REF TSB 12-04-21-001A FOR DES STORY BEFORE ORDERING)(FOR 1ST DES SEE 19259038 FRT HALF 2-SPD MAN SHFT ALUM TRANSFER CASE(NQG) 2nd Design 4WD