if i but calmini 3" arms up front and shacles in the back
wont i be short in the rear

Yes, the shackles are good for about 1.5" of lift depending on which ones you get.

you need to buy add-a-leafs too for the rear. costs about $150.

It's better to be short in the rear, Than short in the Front...

Only if you crank the torsion bars to bring the front end up.

The UCA's only bring the front suspension geometry back into check after you lift the truck by cranking the T-bars like Eric was saying and allowing you to re-align the front end. If you put on the UCA's without cranking the T-bars you will have no lift and the suspension geometry will be off until you crank em up.

Tim

so...
i can put these on and lift the front level with the shackles lift and i would b ok after alignment until i can get the extra leaf lift