Is your GMC R2500 in need of maintenance? Let us help. 1988 GMC R2500 Sierra Classic GAS 5.7 V 8 Transmission Automatic 3 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 R2500 no longer in production? No Worries! We can help you maintain it like new! Ask us how!