help rear shocks

[suffolk boy]

hi yesterday spent the afternoon changing the rear shocks after my bilstiens sprung a leak.all went well apart being a tourer all the back end had to come out .anyway drove it today and it sounds like it is about to fall apart the noise is awful their is a bad rattle . i am my wits end the only thing i think off have i over tightened the bottom bolts effectivley locking up the rear end ?i just did them up until the dynamic absorbers did not rotate.failing a cure for this anyone want to buy a ztt