Hi and thanks for using 2CarPros. Com.
The say bar is designed to help improve vehicle stability. So although it feels fine, it is not working properly. The parts are not expensive and easy to install.
Here are the directions for replacement specific to your vehicle: (Sway bar Link) Picture 1.
2007 Chevrolet Impala V6-3.5L
Vehicle  Steering and Suspension  Suspension  Stabilizer Link  Service and Repair  Front Suspension
FRONT SUSPENSION
Stabilizer Shaft Link Replacement
Removal Procedure
Raise the vehicle and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle.
Remove the tire and wheel assembly.
Remove the stabilizer shaft link bolt and nut.
Remove the stabilizer shaft link from the vehicle.
Installation Procedure
Install the stabilizer link into the vehicle.
Notice: Refer to Fastener Notice.
Install the stabilizer shaft link bolt and nut.
Tighten the stabilizer shaft link nut to 23 N.M (17 lb ft).
Install the tire and wheel assembly.
Lower the vehicle.
________________________________________________
If the problem is a swaybar bushing here are the directions: Pics 2 and 3
2007 Chevrolet Impala V6-3.5L
Vehicle  Steering and Suspension  Suspension  Stabilizer Bushing  Service and Repair  Front Suspension
FRONT SUSPENSION
Stabilizer Shaft Insulator Replacement
Removal Procedure
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
Remove the left and right side stabilizer shaft insulator bracket bolts.
Remove the left and right side stabilizer shaft insulator brackets.
Remove the left and right side stabilizer shaft insulators (1) from the stabilizer shaft (2).
Installation Procedure
Install the left and right side stabilizer shaft insulators (1) to the stabilizer shaft (2).
Install the left and right side stabilizer shaft insulator brackets.
Notice: Refer to Fastener Notice.
Install the left and right side stabilizer shaft insulator bracket bolts.
Tighten the stabilizer shaft insulator bracket bolts to 42 N.M (31 lb ft).
Lower the vehicle.
________________________________________________
I hope this helps. Let me know if you have other questions.
Take care,
Joe
Images (Click to make bigger)
SPONSORED LINKS
Sunday, June 10th, 2018 AT 9:16 PM