I see you posted your problem here as well. I was not aware that you were running a set of 3” and 1” blocks. I dont like running 4” solid blocks but to stack them is asking for a huge problem. I have seen the aluminum pin from the lower block shear off and needless to say the result was a ride to the local pick a part. This ride wasn’t to get more parts, it was to drop what was left for other people to pick apart. The pin shearing is not the only thing that can happen, usually you hit a bump really hard. At this point you might catch a U-bolt since they are so low and one the blocks pops out and at this point you have a good chance of having rear wheel steering with no steering wheel to control it, the hands of fate have you.
I would pull off the 1” block and see if you still have a problem. In case you don’t go back to the other thread, other things to check are the carrier bearing and U-joints.