My Cherokee sags a little in the back. I am debating between two options getting me toward a 2 inch budget boost. I plan on using 2" poly spacers in the front but for the rear should I:

1. Replace the leafs with an OEM replacement and do a 2" shackle
Or
2. Get the rubicon express 2.5" add-a-leaf from quadratec. Will the 2.5" compensate for the sag and be "close enough" for an equal 2" lift?

 

add-a-leafs ride like dog *****. and the best way to measure the difference between the front and back is to put the jeep on flat ground and measure the front of your rocker to the ground then the back of the rocker to the ground, thats how I did it and it worked

 

So you suggest new leaf springs and then a shackle drop? Any brand suggestions for a full leaf pack?

 

Shackles and helper leafs will still leave you with bad springs.
I bought mine in january with saggy rear leafs and 4 blown shocks. For around the price of new oem leafs, I got a 3" lift with a full leaf pack. The front shocks and springs, I installed my self. Rust was a problem in the rear, so I had a shop install them. This would have been the same if I was going oem anyway.
In the end, oem or 3" lift ended up costing about the same.