Axle slide side to side proper one side but other side tight due to bent Trailing Arm
 

My understanding is that when an SC is on a lift you should be able to grasp a rear axle with your hand and slide it side to side an inch or so. In other words, you can slide toward the center of the car (toward the transmission) and then outward away from the transmission. You can see this compressing and extending the rubber bellows of the opposing CV boots on the axle.

But, here's the question: Assuming you have an inwardly bent Trailing Arm such that you can no longer slide the Trailing Arm in and out because the inward bend has taken up the proper slack, what is the damaging effect of this when you drive?

Will this high pressure situation ruin the transmission? What is the no-slack axle then putting pressure on as you drive?

Half shaft could just be dry therefore sticking. You can quickly check your general rear alignment using a meter stick or similar straight edge against each rear wheel while at rest on ground. Mark the front and rear tips- measure the distance between the front and rear tips. They should be parallel or preferably have a slight toe in at the front, say about 6mm (1/4"). Anything more or less will indicate a possible alignment issue.
Johan

The half shaft isn't dry because the mechanic had the shaft out to give it new CV boots. Wouldn't slide before it was removed. Required abnormal force to remove the shaft. Afer shaft reinstalled still wouldn't slide. Wheel appears inset toward transmission at least an inch. But car still drives and shifts and doesn't make abnormal suspension or transmission noises. Like someone wrote though before the half shaft is like a pool cue toward the transmission when the wheel hits a curb. What damage can the shaft too by pressing against the transmission without any slide-ability that it should have?