I swapped out the rear axle and replaced the sagging leaf springs at same time. The shackle was not rusty so I am reusing. I will buy new ones if need be. But I am confused on the OEM shackle, when the bolt is tightened down (spring-to-shackle bolt) it no longer moves very much by hand, only the deflection of the rubber bushing allows any movement. Is that that way its supposed to be? I thought I'd be able to rotate the shackle easily by hand, ie the metal sleeve should rotate inside the rubber bushing.
https://www.amazon.com/gp/product/B00A195LXG/ref=ox_sc_act_title_2?smid=ATVPDKIKX0DER&psc=1
https://www.amazon.com/gp/product/B00A195LXG/ref=ox_sc_act_title_2?smid=ATVPDKIKX0DER&psc=1