Can front spacers be used without that front isolator?

 

Yup, I've done it before but it can lead to some squeaking on the trail. No biggie though

 

Even when putting in a 3/4 daystar spacer it would squeak? And just how thick are those front isolators? Are they 1/2 inch?

 

Well first off, all I said is that it can squeak on the trail as polyeurathane is a pretty squeaky material compared to rubber. When flexing your Jeep, things move around and at least for me, I have found this to be the case.

As far as the actual thickness of the factory rubber isolators go, they measure 3/4" but are shaped to cup the coils and I think the measure up to 1/2" once compressed.