1.5" wheel spacer help!

I have bought a set of 1.5" wheel spacers and the nut runs up on the stud with only 2 threads left inside the nut from being flush and they are tight right now, should I be worried that there's only 2 threads and get longer studs or will that be ok?

 

Hub to outside of spacer, or spacer to outside of wheel? If the stud is shy of clearing the nut inside the spacer, I wouldn't think that was good. I wouldn't run them.

Either way, you may want longer studs.

 

The wheel spacers is installed and all the nuts all ran down and are tight but the nut is shy by 2 threads of having the whole stud inside the nut

 

I would not drive like that!!!!!!
Yes you do need longer studs!
Longer studs aren't that easy to install, much easier to go to a .75" spacer instead. Or buy rims with the spacing you really want.
I would never trust my life to two threads...

 

The nut isn't being held on by 2 threads there's a total of 11 threads inside the nut so there's 9 out of 11 threads the nut has on the stud from using all 11 threads inside the nut so is that enough or not enough?

 

I would not drive like that.