You will have to implement a c notch in your frame. This will consist of cutting your frame and either making a c notch yourself, or buying a kit. Either way your towing capacity will surely change. Depending on how low you want, you will need to specifically get the right kit. From my understanding a flip kit will automatically drop the rear 6", and 4" is the max you can drop without a c notch. Not sure if this helps, but my 2 cents.
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