Before I bought my 5100 zinc's for my 4X4 3/4 ton, I researched a bunch. The stock length 5100's had reviews of being rough due to (for my style truck) the shocks either bottoming out or going to full extension. The 1.5" or 2.5" give a little extra travel. Never the less, I called the above company and told them the how's, when's, and why's of my truck usage. They in turn ask me questions and ultimately recommended the 1.5" for my application. I am completely satisfied with the 5100 zinc's and are a world of improvement over the OEM shocks.
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