Hi Tom the transmission fluid should be flushed every 2 years or 20-30,000 miles.
The radiator fluid should be changed every 2 years or 30,000 miles if it is the green coolant.
The orange or red coolant can last up to 100,000 miles but some people advise to still have it changed closer to 50,000 miles.
〉 Answered on Jan 15th, 2013 by Colleen McGee, Driving Instructor at Americas Driving School
Every 100,000 miles if under light or normal driving. Extended use, or heavy hauling of any kind, and it should be changed every 50,000 miles. Best of luck!
〉 Answered on Jan 15th, 2013 by Karen Salvaggio, Owner/ Editor Thunder Valley Racing and Professional Race Car Driver at Thunder Valley Racing