Please check notes in each part listing to ensure the Tensioner Pulley is correct for your 1978 GMC G25 VAN RALLY with a 6.6L 400 4BBL engine. Special restrictions like "California only" or "with sport package" may indicate a Tensioner Pulley fits only certain 1978 GMC G25 VAN RALLY models.
Clicking a "More Info" link will display a picture and/or other details about that Tensioner Pulley in a separate window (you may need to turn off your pop-up-blocking software for this to work).
After choosing a Tensioner Pulley, click the "Add Part" button. Shipping costs will be shown on the Shopping Cart page. You may use your browser's Back button, or click on "Find More Parts", to find more Belt Drive parts, other GMC G25 VAN RALLY parts, or parts for a different vehicle. Please try our Interactive Catalog (click red Start button above) for faster searching. Both catalogs use the same shopping cart, so any auto parts you've already chosen for your 1978 GMC will not be lost if you switch.
