The patented Insta-Trac system was standard on all four-wheel-drive Compact S-series, and fullsize C/K Pickup models. Insta-Trac made it easy to shift into and out of four-wheel drive without leaving the cab. “On-the-fly” shifting from 2WD to 4WD HI and back at any speed is possible with the Insta-Trac system (vehicle must be stopped to shift into 4-LO). … Continue reading 1986 Chevrolet 4X4 Insta-Trac Manufacturer Promo