Draining & Refilling
WARNING: This page does not describe the selected car, but rather 28 other vehicles, including the 1987 GMC Vandura Special, 1987 GMC Vandura, 1987 GMC Value Van, 1987 GMC Suburban, and 1987 GMC Safari. However, it is still accessible from the selected car via links, so may be relevant.
Loosen transmission oil pan bolts. Pry pan loose with a large screwdriver and allow fluid to drain. Remove oil pan, gasket and filter or filter screen. Replace paper element filter (if used). Clean filter screen and pan with solvent and blow dry with compressed air. Install oil pan with new gasket. Add fluid to proper mark on dipstick.