PopularMechanics.com, TransmissionRepairCostGuide.com and AutoMD.com are a few websites that offer general instructions for changing transmission fluid. Some auto dealers such as University Honda offer instructions for particular models on their websites.
PopularMechanics.com offers a detailed analysis for proper transmission care and maintenance in addition to step-by-step instructions for changing the fluid. TransmissionRepairCostGuide.com includes a breakdown of expected costs along with in-depth instructions for changing transmission fluid. AutoMD.com uses color photographs to illustrate each step in the process of changing the transmission fluid and filter.
Some individual dealers offer maintenance instructions for specific models. For instance, the University Honda website offers pointers and a video for changing the transmission fluid in a Honda.