Rear suspension knock., Searching wasn't helpful. Options

[richee3]

I recently installed TRD coilovers on the Celica to replace the aged stock suspension. The struts weren't totally blown but they weren't great and the springs had to have helper blocks in them, but they were quiet. After lowering, we found that the rear started knocking quite badly. Based on recent threads, I replaced the rear sway bushings with 16 mm with Energy Suspension bushings and the end links with Racing Beat Miata end links. While this cut the knocking down by half, there is still a persistent knock. It only happens at low speeds and seems to be from the right side more than the left, but it isn't strictly on one side or the other. All nuts and bolts have been checked and are confirmed to be tight.

When I searched, the only potential suspects I can find are trailing or control arms or the exhaust hitting the car. I don't believe it's the exhaust since it only happens at low speeds and I've followed the Celica and the exhaust seems stationary. So what are the odds that I need new rear bushings and it didn't become apparent until I was lowered? Anything else I should check? Any help or advice is greatly appreciated.

By the way, I'm intending to replace my rear bushings anyway, I just haven't done it yet. Procrastination is terrible.

[richee3]

Thanks guys. I've got some stuff to test for sure when I get a chance, and hopefully I can find the source of the knocking. It's driving me crazy. It sounds like something is very loose in the rear end, but goes away above 15-20 miles an hour. If I hadn't rechecked them a couple of times already, I'd swear I left a nut or a bolt loose somewhere, but all the ones I've touched are tight. I guess lowering added enough stress to make an existing problem more obvious. I was planning on replacing my bushings anyway but Stef's thread scares me since I have no air tools. I'll probably have to pay to have that job done so I've been putting it off. It's going to happen eventually, so why not now?