They didn't get relegated but when Leeds won the league in 1992 (Howard Wilkinson - still the last English manager to win it), they didn't win an away league match all of the following season.
Norwich City finished third, too.
Since the financial gulf was artificially but very forcefully widened under the ludicrous notion that it would benefit the national team.
Before that, during the 1980s, Liverpool (not the richest club) ruled the roost, but Ipswich Town (twice), Watford, Southampton all finished runners-up...