Adding a 3.5 lift, need expertise on rear suspension settings

Oh boy. I'm working with a 7 ft garage so I can't afford another .5 or 1 inch

 

Nice ride man. Like it!

 

Here is my old 2014 with a 4.5” BDS and 295/70. I think it looked great but everyone has a different opinion on what looks good.

 

Pic

 

I believe stock Tundra height is ~76 inches. So you have room before you reach 7 feet (84 inches).

 

285/75r18. It's the same size tire. Lots of options.

Also... I wouldn't get that lift. If you want to avoid rub completely, even when turning and compressing the suspension, you'll need to do the same clearance mods regardless.

Get 5100s or similar, set to ~2". Better shocks, and you won't need UCAs. Leave the rear alone. Put 285/75r18s on your stock rims (or go with 295/70 as originally planned), remove or move any plastic that gets in the way. Simple... looks and works good... relatively cheap.