was modified where the air pump was eliminated and further lightened. From at least 1991 onward, all S10 Blazers and Jimmies came with four-wheel anti-lock brakes as standard equipment. The first two years of the ABS system had axleshafts with pressed-on ABS toner rings, which were eliminated during the latter half of the 1993 model year (rear ABS control was now done via the vehicle speed sensor). A 5-speed manual transmission remained standard through 1994, but only with the TBI engine. Only the two engines were offered as options - the base TBI and the CPI (introduced in 1992 for the S-series and Chevrolet Astro minivans; the latter had the "Vortec" logo on the intake plenum). 1993 had a few changes - the center console was raised (with a dual cup holder), and the 4L60E transmission replaced the 700r4. The grille (alongside the S-10 pickup) was revised (which was a chrome-plated version of the base work truck grille found on base S-10 pickups), along with the addition of optional 5-spoke alloy rims (for the 2WD model - basically a copy of the 3rd generation Camaro Z28 15" alloy rim). Although the second generation S-series pickup debuted in 1994, the S-10 Blazer and Jimmy continued unchanged for that year, with the only significant changes being a third brake light and the discontinuation of the rear spoiler. 1994 was a transition year for many automakers when it came to switching from R-12 Freon to CFC-free R134a refrigerant. The redesigned 1994 S-10 and Sonoma pickups used R134a refrigerant. Despite being nearly identical to the 1993 models, the entire 1994 model year full-size pickup and SUV lineup (C/K, Sierra, Suburban, Yukon, etc.), also used R134a. The 1994 S-10 Blazer and Jimmy seem to have used R-12 until the end of their production run and subsequent replacement with redesigned 1995 models that looked like the new-for-1994 pickups. Second generation (1995) The all-new Blazer was introduced in 1994 as a 1995 model year. This time, it lost the S-10 prefix for simpler identification, as the full-size K5 Blazer was discontinued. (the GMT400-based Blazer was rebadged as the Tahoe; the Tahoe package which was the base trim for past S10s was redesignated as the LS.) Exterior and interior size were increased, bumping it up to a mid-sized SUV. The Blazer was Playboy Magazines Truck of the Year for 1995 and was also the unanimous winner of the