No way a brush guard would necessitate any t-bar adjustment.

1) Torsion bars are the "springs" ths support the front end, except they're straight steel rods that twist under tension.

2) The amount of adjustment that will necessitate an alignment varies from truck to truck, depending on how close to the alignment tolerances it is before you make the adjustment. Some have plenty of leeway, some don't.

3) see #2

Don't mess with your t-bars unless you're getting tires that are 32" or larger in diameter.

Brent