Yep. Just had a look and the mount is stuffed. Actually it looks very bad, probably because it is still under load. The transmission mount is OK but I will need to change that soon too because of the extra work it has to do at the moment.
Well this isn't technically a suspension post but it's more commonly used for suspension than anything else.
I'm robably going to get flamed for this but for those who don't know I hate urethane for most applications it's used for. Eg Engine mounts (as you can see below) and most suspension mounts. The exceptions are those which have very little lateral or vertical load and no twist apart from perpendicular to the mount.
For example, urethane mounts on our front upper wishbone where it bolts to the car I'd be OK with (hence they are still in my car). Swaybar D rubbers I'm OK with as well as there is not too much vertical load applied to them. However, lower control arms, no thanks.
The reason being Urethane deforms much more plastically (as opposed to elastically) than rubber, meaning it doesn't spring back properly. The problem is deformation of the mount over time (a relatively short time) and then things move like they shouldn't.
Anyway, I couldn't find just how old this rollstop was but it is certainly less than 3 years. And check it out! and that's without an engine in it so add another 5mm or so deflection with the engine hanging on, probably 10mm under load. The tailshaft was hanging mighty low I must say. Now that half my vibrations are gone, back to getting that SAYC diff angle correct....