Tire size ans clearence lowerd 12 gt
 

I have 275/35/19 up front 285/40/19 in rear i want a 275/40/ 19 up front but i dont think it will fit under my fender the 275/35 /19 dose fit https://cimg5.ibsrv.net/gimg/themust...05ec127049.jpg285/40/19 in rear 275/35/19 front lowerd thinking about doing 275/40/19 up front

Which springs are you running? I run a square set up with 275 40 19 with Steeda sport springs and have no problems.

I agree with EF1, I ran 275/40-19 for a while. Then I got Steeda sports, and they still fit without rubbing. If you're lowered >= 1.5" up front it could be tight.

Depends also on wheel offset. I'm running 305's up front at the track with no fitment issues aside from i can't turn to steering lock, as the tire will make contact in that extreme case

Why a 285/40 rather than a 285/35?
The 35s are closer to stock diameter, IIRC.