Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits. Anti-spam check. Do not fill this in!=== 1991 === <span style="font-weight:normal;">The standard engine was the 4.3-liter ohv V6, which was modified for more quiet operation. Optional engines included 5.0-liter, 5.7-liter, and 7.4-liter ohv V8s, a 6.5-liter diesel V8 and a turbocharged 6.5-liter diesel V8. These engines were used to mate to a wide variety of light- and heavy-duty 5-speed manual and 4-speed automatic overdrive transmissions. Four-wheel-drive versions featured a 2-speed transfer case with a floor-mounted shift lever for shift-on-the-fly operation.</span> Summary: Please note that all contributions to the Cars of the '90s Wiki are considered to be released under the CC-BY-SA Cancel Editing help (opens in new window) Retrieved from "https://90scars.fandom.com/wiki/GMC_Sierra" Categories: Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.