I remember stuff like that too. I was a college kid, so I was looking for something inexpensive but was not interested in one of the direct drives - I would have bought a used belt drive washer first.
I have read that the first direct drive models came out in 1980. I didn't see any for a while, so they must have been limited in production. I do know however that the lower echelons of the Kenmore line were DD by 1984 if not earlier, starting with the 24" machines. The low line 1983 models didn't stay around long. In August 1986 I tried to get a two cycle big capacity machine and the salesman told me they'd been dropped a couple years ago and that a whole new line of big capacity versions of the new design were about to come in. So, I bought the least expensive 70 series. I did this after shopping Whirlpools at Circuit City. They had a belt-drive machine that was about $10 cheaper than the Kenmore and it had a recirculating filter that I thought would be cool, but they had it left only in Toast color, so I went with the white Kenmore. Now I wish I had both.
I was in a "kiddie condo" for school, and was about the only one in the building with a washer. The girls behind me wanted one, so they pooled their money and about 3 weeks later we went back to Sears - the floor had been totally rearranged and the new washers were everywhere. I was horrified, lol! My model and the Lady K were relegated to the closeout area. This was early October 1986.