my 1990 740 wagon will not shift out of low gear until it warms up, could this be from a vacuum leak
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1990 Volvo 740 Question: will a 1989 749 coupe transmission fit in a 1990 740 wagon
Answer #1Bret Bodas from RepairPal Test Shop, June 02, 2010, 09:19Master
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.