Originally Posted by robbiegtp
I just installed upper and lower tubular control arms in the rear and installed lowering springs now when im taking off or when giving it gas i get a knock noise from the rear. I checked all my bolts everything is tight. What could be causing this? Its a 94 mustang. thanks for the help
If the control arms have Heim joints they should break in and stop creaking in a short time.
If you have poly bushings, the noise can be permanent if the bushings are not grease-able. Some companies ship a special silicone installation grease that counters these noises. If they are installed dry they can make quite a bit of noise and it may not go away.