2001 V40 4th gear flare and delay when going to drive

[Skeletor]

I have recently replaced the B4 servo cover, and just flushed the transmission. I notice some improvement in all other gears (they seem to be working normally). However I definitely have a flare when the transmission shifts from 3rd to 4th, and also when going from 5th back to 4th. I also have a noticeable delay when going in to drive (reverse has no delay). So I am wondering what you think. I am thinking that I have a solenoid that needs to be replaced in the valve body??? Not sure if the valve body is the issue, but I am inclined to doubt that. But I am open to suggestions. I was wondering about the transmission control module needing to go through adaptation. I have made a few calls and have been told it does not have a computer so it does not have an adaptation feature. Not sure if that is correct information or not.

[alschnertz]

I've also been wrestling with transmission issues on my '01 S40 lately.

Are you sure the fluid level is correct? I haven't had a delay issue in the S40, but did have delay when shifting into gear from P or N on a '95 850. Turned out the problem was that it was down a pint of fluid. Was surprised that that little amount could cause an issue, but it did clear the problem.

When you check the level, be sure the transmission is hot - like driven for at least a half-hour hot. And check on a level surface. It's kind of a pain to read the dipstick.

I also have heard that you do not need to reprogram anything when changing the TCU on a 2001 S40.