CV Boot-99 Forester

Nearly a couple of years ago I posted a query to this newsgroup on what could be the source of a solid thumping (noise and physical feedback into steering wheel) coming from the front end steering when making slow turns, like into a parking space- usually after the car has been driven a number of miles to get things warmed up. One suggestion was the viscous couplers. I had our local mech check this out and they agreed that is was the viscous coupler. Repair estimates ranged from $2K to $4K depending on rebuilding the current trans or replacing with a used one. I didn't opt for either. Then there was burning oil smell and I found that the right front CV boot was ripped and spraying lube around. I had the CV boot and axle replaced for around $180 and the thumping is now gone. Now it still may be the viscous couplers because the weather is pretty cold now and I am not sure if that is dampening out the thumping but after many miles and plenty of time to warm things up the thumping is no longer there. Though I would update this forum. Thanks for the helpful suggestions in the past. Mark