Is your GMC Syclone in need of maintenance? Let us help. 1991 GMC Syclone Base GAS 4.3 V 6 Transmission Automatic 4 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 Syclone no longer in production? No Worries! We can help you maintain it like new! Ask us how!