I have a full Detroit v6 rear in my dd. It has about 5000 miles on it and so far I could not be happier. I tow with it as well. It clicks on rare occasion, perhaps once a month, but nothing scary like my lunchbox did. I know the older style Detroits were a lot more violent but improvements were made to them so they are friendlier now and they are now called Soft Lockers. Perhaps yours is the older style? If not, before I spent all the money on a selectable, I would look inside to see if the center pin is in fact sloppy and if so replace it. I know people with ancient ones that work fine.
