If you do replace it...look into the belt-drive ones. Or screw-drive. They are quieter than chain-drive units, but more expensive. I'll have to look at mine to see if there is a weight setting dial. Thanks for the tip!
Oh, and guyod, the door is 16' wide, not tall! It's a pretty standard 2-car garage door size. At least I think it's 16'. Garage is just big enough for my mid-size truck, our wagon, golf clubs, and some other junk. Not too huge. But, thankfully, I have a separate 1-stall garage in the backyard that I use as my shop. That's also where I keep my motorcycle. And, it's my little "getaway" from the wife.