I have an early production 323i wagon, that is developing a transmission problem. The current transmission is a GM A5S 360 or 5L40E with a SW designation on the label.
I am thinking of swapping it with a later GM A5S 390 or 5L50E that was used in 325-s. The gear ratios are the same and it is a direct bolt in, however there are other issues that could come up and I don't want to spend all that work for nothing.
Has anyone done this before or anyone with transmission knowledge could comment?
Thanks in advance