Hello,

I have a 1990 740 that has about 227,000 miles on it. Recently replaced the fuel pump and a week later, though it functions normally in the city, when I take the car onto the freeway, it will run in the overdrive gear instead of Drive.

I checked the relay behind the ashtray, it looks fine.

The mechanic where I usually take my car told me over the phone that it could be a kickback cable; however, when I looked in a Chilton service manual, there was no mention of a kickback cable anywhere.

If I change the transmission oil will that be a good start to eliminating my troubleshooting options? Can anyone explain to me the procedure for changing transmission oil?

Any other troubleshooting advise would help alot. Thanks.