I was looking through the 1984 book "Television Comedy Series: An Episode Guide to 153 TV Sitcoms in Syndication," by Joel Eisner and David Krinsky. (Jerry Beck, back when he was working in TV catalogue sales for United Artists, is credited as one of their sources for the information.)
The book was useful at the time, when episode titles and writing credits were hard to find for most shows; it's been rendered obsolete by the passing of time and the availability of online episode guides. Also, the authors have a bizarre rant in their introduction about how badly television has declined since it started in with social issues and stuff. ("Television banned violence on network shows when they thought it was harmful to children, but did they ever stop to think what mental harm is done when a child believes prostitution, vasectomies, unwed mothers, V.D. etc. are all hilarious subjects?") However, one thing that Eisner and Krinsky have in many of their descriptions, which I find interesting, is a description of how the show did in syndication. (They got some of their information on the shows from TV stations and syndicators, so along with the episode lists they were presumably also able to find out how these shows were doing in reruns, or if they were even being rerun at all.) I thought I'd make a note of some of their descriptions to show how some shows were doing circa 1983 when they were writing this.
I don't know how accurate their information is, but I would suspect that it's fairly close to the mark because it mostly confirms things that were known already: all of the MTM comedies except WKRP performed disappointingly in syndication; Happy Days and its spinoffs all tanked in syndication but The Odd Couple was a huge syndication success; some of the Norman Lear comedies didn't do as well as expected.
One thing that's obvious, once again, is that there is no relationship between how popular a show is in first-run and how popular it is in syndication. Part of the reason is that syndication audiences tend to be younger (a bigger percentage of children is watching in daytime reruns than in prime time), but that can't be the whole explanation for every success or failure. Also it seems like shows that focused on women didn't do well in syndication at the time, though I think that's probably changed since then.
Barney Miller - "The series still does extremely well in syndication."
The Beverly Hillbillies - "The now-syndicated episodes are popular in many Southern cities but not elsewhere, perhaps because it is felt to be so out of date."
The Bob Newhart Show - "The series was very popular during its original run, but it has been a failure in syndication. It now usually runs during the middle of the night or early afternoon."
The Brady Bunch - "Remains one of the most popular reruns of all time."
Chico and the Man - "The series has all but died in syndication even though it is still run all over the country. This is due to the death of Freddie Prinze during the series. What makes matters worse is that now that Jack Albertson has also died, the series is in worse trouble. Within a few years, the show will probably disappear from the air completely."
The Dick Van Dyke Show - "The show was a big hit during the first years of its syndication. However, it has died out in popularity because of its dated look -- caused by the black and white film and fashions of that time."
Family Affair - "The series is still run occasionally but has become too dated for many people and has begun to disappear from many stations."
The Flintstones - "It is still a big hit over twenty years since it was first created, as it can never become dated."
Gilligan's Island - "Despite contemptuous reviews by critics... Gilligan's Island has remained one of the most successful syndicated comedy series of all time."
Gomer Pyle, U.S.M.C. - "Still a popular series today, Gomer Pyle's main audience is in rural areas of the U.S."
Happy Days - "The reruns have not done very well at all. Syndicated under the title Happy Days Again, it has been a big disappointment to the local stations which run the show."
The Jeffersons - "The series is not doing as well as it was expected to do."
Laverne and Shirley - "The series is still doing well on the network, but it is a complete failure in reruns despite the fact that it is running all over the country."
Mary Tyler Moore - "This was a very popular series during its rrun, but has suffered in syndication. This is also a more sophisticated series which fails to attract the attention of children."
Maude - "It has done very poorly in syndication."
Mork and Mindy - "It entered syndication in September 1983 and immediately died."
Nanny and the Professor - "Seen frequently on small rural stations (mainly UHF) but rarely in large cities."
The Odd Couple - "The series did fairly well on the network but is a big hit in syndication."
What's Happening! - "It didn't do very well on the network, but it is doing rather well in syndication."
Other shows that did well in syndication include:
The Addams Family
I Dream of Jeannie
I Love Lucy
Leave it to Beaver
Welcome Back Kotter
WKRP in Cincinnati.
Shows that didn't do well in syndication (as of this book):
Our Miss Brooks
The Patty Duke Show