Wandering rear end.

[Ekspat]

I have been experiencing a rather worrying problem. If I am driving on a bad road with holy indentations, or over manhole covers the rear end wants to go somewhere else! Also if the road surface is good but smooth and wet the car can suddenly feel as if it was on ice. I went to the garage yesterday and the mechanic used forty minutes checking all the joints and found no worn components. After driving the car himself he suggested the shockers, but I cant even move the corner down at all. It is a very frightening feeling, and I had to stop yesterday when driving home as it felt as though the car could suddenly end up on the wrong side of the road. If the road is good and dry it is fine.
Does anybody have a good explanation?
Thanks.

[Crasher]

It was very common for the subframe diff mount to crack and make the tail wag the dog.

[Ekspat]

That sounds very final, especially when considering that I just replaced it in the summer! Do you know if it is basically the same place it cracks, can one repair it?

I just tried to attach a photo of the new subframe but I cannot see it!

[Crasher]

The mounts can crack around their weld points

https://live.staticflickr.com/65535/52522266476_e358f252ff_o.png (https://flic.kr/p/2o2dkYy)type 85 rear subframe (https://flic.kr/p/2o2dkYy) by Steve Cresswell (https://www.flickr.com/photos/141203253@N03/), on Flickr

[Ekspat]

Pity my photo never appeared as you can see a deffinite difference between the two. The one you sent must have been spot welded and the steel is not very heavy gauge, very flimsy looking. However the one I have has welding very visible and a different construction.
So I will have to check it to be sure but what other possibilities are there, a broken spring or shock absorber?