Sometimes, but normally there shouldn't be more than a slight clunk when it ingages. I have occasionally experienced grinding gears for a few seconds.
Thanks Will 4R.
Since I bought my 08' 4runner it never make a sound, nor would you feel it engage until about a month, or so ago. Then it was pretty severe. I took it in to a local dealer and they tried to convince me that it was normal for it to make noise and kick when it engaged. Thats why I was looking for some experience form other 4runner owners.
This is my first 4runner and I like it, except for a few concerns like the 4wd.
Thanks again.