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Q:

High pitched sound at higher speeds on 1991 Volvo 240

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
at around 62 mph the engine makes a high pitched sound.
(2) Answers
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Check the fan belt tension. A loose fan belt for the alternator or power steering usually shows up when starting the engine or operating the steering but you could have a loose belt. A cracked heat shield for the exhaust may also cause a noise under certain engine load/temperature conditions.
It sounds like your center support bearing on the drive shaft is bad. There is a two piece drive shaft and a bearing in the middle have that checked