I am going to go with the SDORI ball joint spacers from toytec, I was just wondering if the add-a-leafs are going to be alright or should I spend the extra money and go with a whole new spring set up? Also I have plenty of flex in the rear just want a little extra height to match the ball joint spacers will the add-a-leaf ruin my rear flex?
somewhat...
Add-a-leaves will change the ride height. You have the same amount of flex no matter what. The leaves are basically only there for support....so...
Add-a-leaves will add lift by adding a considerable amount of droop, via a serious bow in the leaves. So when you suck them up by the spring pin, they create a rise



It will buck like a bronco. (At least until they break in. At which point they'll start sagging.)
It will loose droop.
If you are happy with the flex you got:
You can add lift blocks* (just plain spacers) and possibly shocks. I would try to find solid steel. I will assume that since you said, "match the front", we're not talking a ridiculous amount. So blocks will be fine. Sounds like you need about an inch or less.
This will keep ALL of your ride, load capacity and geometry the SAME as it is now.
You can install longer shackles and shock$. Not the most economical, but you will gain more droop. Welded shackles...

will cause more bind, and slightly limit flex. But they are the heaviest duty.
This type...

Will allow more flex. (or, you can just get a set of revolver shackles. That will prolly also lift the rear enough to match the front. Just research the ride. You might not like them.)
revolver shackles - Google Image Search
uhh

A spring with many leaves will flex great. And since you need a minimal amount, I'd say OME. as far as a moderate lift, I feel OME springs are the best. With the many, thin leaves you can "Taylor" the spring to suit your needs. If I wanted or needed 3" or better, obviously (since they don't make leaves with that amount of lift) , I'd look elsewhere.
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