You might see a moderate amount of lift with the new springs. The main reason being is the Rubicon springs have a higher spring rate but that could mean a stiffer ride. If all you're wanting to gain is an inch to an inch and a half I'd look into a budget boost. You can pick up four pucks for around $ 25 each and pick up some longer shocks. Skyjacker has a decent BB for around $ 250 which includes the pucks and shocks. I ran it for a little while and it did just fine. The Skyjacker includes everything you'll need.
It would be a waste of money unless you just want a better ride. I have a Rubicon 4.5 lift and the ride is way better than stock. I started with the Rubicon shocks killed one in a few years. I have the Rancho 9000's on my jeep now and I like the fact you can adjust the ride.
they wont help, i blew $75 on them for nothing at all
if you are looking for a suspension lift (not spacers) then get a front and rear set of springs out of a V8 grand cherokee (ZJ) ... they swap in and net you about 1.5" up front and 1.75 out back ... though they do stiffen the ride a little bit.
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