For the last few months the automatic tranny on my 91 240 wagon with 240,000 miles has been acting up. Reverse works close to normal when cold,But after 20 minutes of driving it requires significant gas in order to get reverse to partially engage. It almost feels like something might be locking up, causing hesitation in backing up. Changed the transmission fluid using the transmission to radiator line, twice in the last 40,000 miles using non synthetic oil. The tranny was rebuilt by the previous owner at the Volvo dealer around 75,000 ago.
The Transmission also shifts normally in the forward gears except for a slightly harsh shift into second which has been there for the 4 yrs I have owned it. I'm tempted just to drive it till it gives out, but would hate to torch it if there's a cheaper fix.