I have a 1995 AWD Subaru Legacy L Wagon with 190K miles. Lately, I’m getting vibration for about a second or two when I steer left at very low speed, like 5 mph. Most turns are faster than that, so it doesn’t happen very often when driving on streets. Most likely in places such as a parking lot. It feels and sounds similar to driving over a metal grate, and actually thought it was at first. Also, just turning slightly to the left doesn’t do it–at least 45 deg., or maybe a bit more.
Had the manual transmission replaced three years ago, but haven’t had any problem with the steering. I could live with this if it doesn’t get any worse and isn’t a safety issue. But if it needs to be fixed, I’ll take it to a mechanic.