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Q:

transmision trouble on 1991 Volvo 740

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The does not always shift into overdrive
(1) Answer
This can be due to the upshift cable, overdrive relay or the transmission is going out. Have a Volvo tech take a look at it and they'll be able to determine which one it is.