Rear vibration upon acceleration

I’d remove those yesterday.

 

That is trouble on a stock spring Simon. A small block for leveling purposes is reasonable, but using blocks as a lift kit is not a good idea.

 

Yeah I’m trying to get rid of them ASAP they are giving too many headaches

 

Double check that the U-joints are intact also. I had very similar symptoms which progressed to the point where I couldn't ignore it over the course of about a month. I read tons of threads about the angle issue with drivelines, and was convinced that this was the issue until I finally climbed underneath and discovered that one of the U-Joints was completely destroyed. $200 later, a driveline shop had all the U-Joints replaced and I was back in business.

Could be the balance issue, but just make sure that everything looks intact. It could be something obvious which was overlooked.