Factory lift blocks

[Felske]

Hello all. New to the site and thankful for finding a bunch of likeminded people. This is my 5th Cummins it’s a 2002 6spd 2500 longbox 4wd. About to turn over 500,000 kms (Canada).

 

Love it and it does everything I need it to but recently I’ve been noticing what feels like an awful lot of axle wrap while towing. I got to tearing into it yesterday and found a couple loose u bolts but worse is that the factory lift blocks under the leaf packs seem to be walking off the axle perch. 

 

It it must have been happening for a bit because both the block and the perch are misformed now. My question is do I buy a new lift block and hope for the best or eliminate them all together with just spring or even better I’ve been told to get a shackle flip kit.

 

The pics are just of the left he left side as it was the worst and the only side I found loose u-bolts on. But the right side looks as if it’s moving too. Any input would be appreciated.