Service Intervals

WARNING: This page does not describe the selected car, but rather 26 other vehicles, including the 1983 GMC Vandura Special, 1983 GMC Vandura, 1983 GMC Value Van, 1983 GMC Suburban, and 1983 GMC S15 Pickup. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Trucks and Vans are identified by 2 different emissions control standard classifications: Light Duty and Heavy Duty. Light Duty refers to vehicles up to 8500lbs. GVW; Heavy Duty refers to vehicles over 8500 lbs. GVW.

Check fluid level at 12 month/7500 mile intervals (6000 miles on heavy duty vehicles). Periodic draining and refilling of transmission is not required, with the following exceptions:

On vehicles equipped with 5-speed manual transaxle, drain and refill transaxle at 30,000 mile intervals.
On all "S" Series trucks with 4-speed transmission, change transmission fluid after the first 7500 miles and at 35,000 mile intervals thereafter.