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I am looking at ordering a 4" lift kit from Rough Country since I can't find any taller lifts for 2wd Suburbans, but they only offer blocks for the rear springs. Be it that my leafs are already starting to sag some and blocks cause axle wrap, I want to replace the leafs with new lift leafs. I haven't found any sites that will show me a 4" lift spring for my exact truck, I'm going to have to jump up or down a few years probably. However, across the board I keep seeing 2 different spring lengths, 52" and 56". I have no clue which one I have. Now, I have to admit I haven't tried to go measure them yet (been busy), but how would I measure how long of springs I need. Would I go from mounting hole to mounting hole, or the actual length of the spring itself. And of course, will other year springs fit on the 1991 Suburban? Thanks