Yes, you can replace your 3,500 lb 7-leaf springs with leaf springs that have 3 or 4 leaves because the weight rating is the same. The number of leaves isn't a determining factor; for example, there are 4-leaf springs for both 2k and 6k axles. So you simply need springs with the correct rating for your axle, as well as the right length.
For that, you'll want to measure the length from center-to-center of the spring eyes, taking into account you current leaf springs will have elongated... view full answer...
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