Poly bushing change out
I did my complete car myself. Did you remove the metal sleeve that was around the old bushing? When installing poly you are supposed to press out the sleeve. The poly bushing is a little bigger to make up the difference. I actually did mine with the bar still in the car. I had everything else out already, left the bar attached to the rearend, but took the bolts out of the crossmember that runs up to the tranny to give room for it to slide a little. Then put a jack under the rearend housing,(make sure you have rubber between the jack and the housing so it doesn't slide. Then take the bolt out of one side at a time and slowly lower it and it will hang just enough under the bracket to get the bushing and sleeve out. I took an air saw and cut a groove almost all the way through the sleeve in two places, and then used a long chisel and a hammer and tapped the sleeve on the outer edge between the cuts to cause it to break the rest of the way. It then collapsed into the hole and I could pull it out. Even with the sleeve out the fit will be tight. If you need to, use a large pair of channel locks to help press it in, just put something on the jaws to keep it from cutting into the bushing. Make sure you lube all the bushings good when installing them, or they will squeek. If you need extra lube, Advance, and Auto Zone sell extra tubes.Also, you are supposed to put weight back on everything before you torque it all down to specs so not to cause binding.