Thank you. You're right, the dryer is the much lighter machine. I'm still hoping the washer can be fixed, but if not maybe we won't break the bank.

I wouldn't spend much money fixing a 13 yo machine. If it is just a minor part, fine, but dumping money into it is not a great idea.

if the dryer works then keep it. Juts make sure that it is secured somehow to the washer so it doesn't walk off the top. I just wouldn't sit it on top as the washer will vibrate

I agree with you, I don't like replacing things that aren't broken. My gas dryer is almost 26 years old and we are on our 3rd washing maching. It seems like the dryer is much simpler technology and less likely to break.

Don't expect the delivery company to stack them.

Have you settled on what you would get as a replacement washer? If you are looking at current Whirlpool/Maytag front load models, your existing stacking kit may fit the new washer or a current stacking kit may fit the existing dryer. That was the case a couple of years ago when I helped a friend replace the dryer in her Whirlpool duet stack. (In her case, it was the dryer she wanted to replace, but it seemed that new kits fit older machines and vice versa.)

As tjmwine says, delivery companies generally refuse to stack different brands or mismatched sets. So, you may need help in putting the old dryer back up. That said, if you have basic DIY skills, or have friends who do, and you buy a different brand of washer with dimensions similar to your old Duet, you may be able to adapt the new washer's stacking kit to work with your existing dryer. This generally involves drilling new mounting slots or holes in the old dryer's sheet metal so the bracket can tie on with sheet metal screws.

In past threads here on the subject of stacking mixed brands of washer and dryer, a common suggestion has been to add a platform of 5/8" or 3/4" plywood an inch or so above the washer and place the dryer on that. (Hopefully, your dryer vent still lines up properly.) Others here have gone with variations on what Dan1888 suggested above --- putting a pad or pads on top of the washer. That gets frowned on in areas that are earthquake prone (and some that are not) , and you'll sometimes see recommendations for adding a retaining bar or two across the front of the dryer to limit the risk of it falling forward from a laundry closet.

My suggestion has worked in a non-earthquake prone location. No other fastening system has been needed. The pads do not allow the dryer to move at all. My lower is a Miele. The dryer is light and I didn't need anyone to assist two of us with installation.