rear suspension noise over tar strips

[911monty]

If you can, while using jacks under the suspension is certainly better than tightening with wheels off the ground, having your wheels on and resting level on ground, ramps or lift is ideal. Reason being different wheel widths and offsets will have an effect on the leverage placed on the wheel bearing and suspension. While minor compared to being off the ground, for PERFECTION have wheels on. This will keep your alignment much longer due to less suspension settling.

PS: Don't even get me started on how bad wheel spacers are for your wheel bearings!!!