The right question for this can be complicated, first of all what are you looking to do with your 4-runner? Towing? Off-roading? Or just overall everday driving?
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Downey makes a 1.5 inch lift progressive spring for the rear, this may be more than you are looking for. I would recommend using a progressive spring because they get stiffer the more load you put on them. I do think that these 1.5" springs would be good since the 4runners tend to sag in the rear anyway. You can check them out on downeyoff-road.com
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