Yale uses 23 letters of the alphabet to designate the year in the serial number. When they get to the end of the alphabet, they start over. The letter "Y" is either a 1978 or a 2001. That model number was made in 1978 but not 2001. So it is a 1978. By the way, your serial number is not too far from my own.

The "GLC030" part of the model number tells us this is a LP fueled, cushion tire forklift with a 3000 lb lifting capacity. The "C" narrows it down to a part of the model run and the "B" further narrows it down to a particular part of the "C" portion of the model run. "J" means it was made in Japan. "UA" means it has a Mazda UA engine. the letter "E" designates the type of mast. I think "E" means triple mast. And finally, "083" is how tall the mast is in inches when at rest