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Is your GMC Sierra 2500 HD in need of maintenance? Let us help. 2012 GMC Sierra 2500 HD SLT DIESEL 6.6 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 2500 HD no longer in production? No Worries! We can help you maintain it like new! Ask us how!