I am completely redo-ing my rear suspension, and all the bushings springs etc are shot. I think the poly bushings will last longer and I would hate to want to go back later and stiffen the rear up some more. The springs have solid aluminum front and poly rear, I will have poly for the shackles also (ordered them already). I bet once its all together it will jar my teeth but wont be all floaty loose and rickety like it is now.
Ok, aluminum and iron don't really wear well together, unless it's a high silicon alloy. When was the last time time it was lubed and have you checked it for movement without any weight on the springs?
Back when I installed my poly bushings I made my own, thicker shackles about 3/4" longer than stock for just a slight lift. Welded grade 8 bolts in and used loc-tite to hold the nuts. Probably could have used nylon insert locknuts, too.
I need to replace these bushings as well. A leaf spring shop told me that they would rearch my springs and put new bushings and u bolts .Should I buy these bushings and take them in since they might have a hard time finding them?And is it better to have rubber bushings or poly?I replaced my whole front end with moog rubber bushings
If you used all Moog rubber bushings up front then use all Moog rubber bushings in the back. It depends on your car and the type of driving you do. If you have a modified suspension, lowering, special springs, frame connectors, or other mod's then sure put the poly bushings in. If not and you just want a cruiser then put the new stock ones in. You shouldn't run a standard rubber bushing in the spring eye and then put poly bushings in the shackle...............either use all rubber or all poly, but don't mix and match.
I'd second that. Poly is a night and day difference when it comes to reducing sloppy handling/improving initial response.. but can be like driving an unloaded dumptruck when cruising around on less than perfect roads. And the more poly you use.. the worse it gets.