Task: Explanation
Input (English): The Muncie SM465 is a heavy-duty, four-speed manual transmission built by General Motors for use in light and medium duty trucks from 1968 to 1991. The SM465 can be found in Chevrolet and GMC full-size trucks, Blazers, Suburbans, among other models. Some applications beyond one-ton pickup trucks came with larger input shafts. Favored by off-road drivers, the SM465 has a very low first gear suitable for rock-crawling. The SM465 has developed a reputation as a highly durable transmission. For the 1992 model-year, the SM465 was replaced in 3/4- and 1-ton pickup truck applications by the New Venture Gear 4500 transmission. Question: Between what years was the transmission built by General Motors used in the full-size, extended length, sport utility vehicle from Chevrolet? Answer: 1968 to 1991
Output (English):  The SM465 can be found in Chevrolet and GMC fullsize trucks, Blazers, Suburbans, among other models.