I already have a lift under mine but want an extra inch or so. I'm going to use MJ shackles on the rear but, has anyone ever used a budget boost block heavy liflt springs up front?

 

budget boost block heavy lift springs? I'm a little confused. Do you mean coil spacers that go above the coils or stiffer springs?
This?
http://www.4wd.com/productdetails.aspx?partID=11704
or this
http://www.4wd.com/productdetails.aspx?partID=8810

Those go above the coil for more height.

 

Cant type worth a damn this morning.

Just trying to put a spacer on my front springs. I dont think I'd be a problem, but wasnt sure if anyone has attempted it and wondered how the ride was.

 

Coil spacers are the most popular "budget" lift that jeepers use.

I am running two 1" spacers (same as a 2" spacer) on top of my Old Man Emu 2" springs. It rides fine. You should be fine as well. make sure you get an alignment done afterwards and adjust the trackbar (if you have an adjustable one). With your 3" springs, i would go with 1" spacer because you are still running short control arms and 4" is the max you would want to go on shorties before the ride startst getting rough. It's all about the control arm angles.

This is with one spacer:

 

I have 2" spacers on coils and 1" at the shocks

 

Old man Emu, same as mine except mine are black I used 2" bar pin eliminators instead of a spacer on top like yours.

 

ya, and spacers are nice cuz the ride won't change, the springs aren't changing, or getting stiffer, just getting a spacer put in.

 

i have the 2 inch spacers on my coil springs, they work great i think