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Is your GMC Sierra 3500 HD in need of maintenance? Let us help. 2012 GMC Sierra 3500 HD Denali FLEX 6.0 V 8 Transmission Automatic 6 Replacement parts at near wholesale prices.  We have GMC technicians on hold ready to take your calls and help you place an order. Is your Sierra 3500 HD no longer in production? No Worries! We can help you maintain it like new! Ask us how!