Not quite sure why monkeys became a huge part of 1970s TV (not just cartoons--remember "BJ and the Bear"?) But somehow both Grape Ape and Magilla Gorilla are permanently etched in my brain.
Grape Ape? Lord, what a moron. He's 40 feet tall and says his name a lot. In the 1970s, this was pretty much all the gimmick you needed for a show, apparently. Despite weighing many tons, he somehow had the superpower to jump on the Mystery Machine-ripoff van and not crush it or the passengers. Also, I do not think he was even grape flavored. But this line from Wikipedia cracked me up, once I thought about it for a second: "Grape Ape appeared in the Robot Chicken episode "I'm Trapped." After Grape Ape was killed, a police officer looks at his wallet and sees that his name is Grape Ape. He then asks if the other police officers heard the 'G' in his name."
I much preferred Magilla Gorilla, although I must have seen reruns, since it ran a little before my time. (1963-1967). It kind of made me sad that he was always sitting in a pet store and no one would buy him. Also, he was a more normal-sized ape, and his adventures weren't quite as stupid. "Take our advice, at any price a gorilla like Magilla is mighty nice!"
Did you watch either of these shows? I also think I had a Magilla Gorilla comic book.