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will a 1989 749 coupe transmission fit in a 1990 740 wagon on 1990 Volvo 740

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
my 1990 740 wagon will not shift out of low gear until it warms up, could this be from a vacuum leak
(1) Answer
The transmissions don't use vacuum for shift control, so no, vacuum leaks won't cause this. If the fluid level is OK, then check the kick down cable, they start sticking and can cause shifting issues. If that is OK then you may have a transmission with internal issues, and it will need to be checked by a good transmission shop.