If your van's a
keeper, one of the first things you should get for it is a factory service manual. The repair books from Haynes, Chilton,etc. just don't compare. If your patient, you may score one cheap on e-bay. If you dont have the time or patience, places like
Books4Cars.com can hook you up immediately. they have one listed (93 G-Van Shop Service Repair Manual by General Motors for Chevrolet & GMC full size Vans incl: Rally, Vandura and Magnavan 93_G_Svc) for
$59.95. Even at that price, it'll pay for itself the first time you use it.