{"product_id":"carli-add-a-pack-rear-leaf-springs-2011-16-ford-f250-f350-4-4-2in-lift","title":"Carli Add-A-Pack Rear Leaf Springs - 2011-16 Ford F250\/F350 4×4 - 2in Lift","description":"\u003c!--kit-includes-start--\u003e\u003c!--kit-includes-v2--\u003e\u003cp\u003e\u003cstrong\u003eKit includes\u003c\/strong\u003e\u003c\/p\u003e\u003ctable style=\"border-collapse:collapse;margin-bottom:12px;\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"text-align:left;padding:4px 14px 4px 0;border-bottom:2px solid #c9cccf;\"\u003eQty\u003c\/th\u003e\n\u003cth style=\"text-align:left;padding:4px 14px 4px 0;border-bottom:2px solid #c9cccf;\"\u003eComponent\u003c\/th\u003e\n\u003cth style=\"text-align:left;padding:4px 14px 4px 0;border-bottom:2px solid #c9cccf;\"\u003ePart #\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:4px 14px 4px 0;border-bottom:1px solid #e1e3e5;\"\u003e1×\u003c\/td\u003e\n\u003ctd style=\"padding:4px 14px 4px 0;border-bottom:1px solid #e1e3e5;\"\u003e\u003ca href=\"\/products\/carli-11-16-ford-f250-350-4x4-progressive-add-a-pack-passenger\"\u003eCarli 11-16 Ford F250\/350 4x4 Progressive Add-A-Pack Passenger\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:4px 14px 4px 0;border-bottom:1px solid #e1e3e5;\"\u003ecliAS-FPAP-11-PASS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:4px 14px 4px 0;border-bottom:1px solid #e1e3e5;\"\u003e1×\u003c\/td\u003e\n\u003ctd style=\"padding:4px 14px 4px 0;border-bottom:1px solid #e1e3e5;\"\u003e\u003ca href=\"\/products\/carli-11-16-ford-f250-350-4x4-progressive-add-a-pack-driver\"\u003eCarli 11-16 Ford F250\/350 4x4 Progressive Add-A-Pack Driver\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:4px 14px 4px 0;border-bottom:1px solid #e1e3e5;\"\u003ecliAS-FPAP-11-DRIVER\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c!--kit-includes-end--\u003e\u003cp\u003eCarli progressive-rate Add-A-Pack rear springs are specifically designed to address the harsh rebound of the factory overload spring they replace. When used in conjunction with a Carli Suspension System, they effectively mitigate the impact of medium to large bumps. By replacing the lower overload springs, which are typically one inch thick and do not follow the contour of the rest of the pack, with a mini progressive six-leaf pack, the overall capacity of the truck remains unchanged as determined by the factory springs. However, the progression of the rear spring rate becomes significantly more predictable. This modification results in a smoother engagement and disengagement of the spring, thereby improving both ride quality and traction.\n\u003cbr\u003eCarli's six-leaf progressive Add-A-Pack rear springs replace the lower overload leaf with six thinner leafs. It maintains factory load capacity while improving ride quality by effectively mitigating the impact of medium to large bumps.\n\u003cbr\u003eWhen it comes to the F350, the main spring pack in the rear is already quite stiff and does not compress much unless under load. As a result, installing the Add-A-Pack on an F350 may actually make the rear suspension stiffer, potentially even stiffer than the stock setup. Due to this reason, the Progressive Add-A-Pack is not recommended for an F350. To achieve optimal ride quality, we highly recommend installing Carli Full Replacement Leaf Spring Packs.\n\u003cbr\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cbr\u003e  \u003cli\u003eProgressive design addresses the harsh rebound of the factory overload spring\u003c\/li\u003e\n\u003cbr\u003e  \u003cli\u003eLoad capacity is maintained, ride quality is improved\u003c\/li\u003e\n\u003cbr\u003e  \u003cli\u003eFits 2011-16 F250\/F350 4×4, w\/ 3.5-inch axle tube\u003c\/li\u003e\n\u003cbr\u003e  \u003cli\u003eIncludes U-bolts and hardware\u003c\/li\u003e\n\u003cbr\u003e  \u003cli\u003eProvides 2.0 inches of lift\u003c\/li\u003e\n\u003cbr\u003e\n\u003c\/ul\u003e\n\n\u003ch3 class=\"fitment-table-managed-heading\"\u003eVehicle Fitment\u003c\/h3\u003e\u003cstyle\u003etable.fitment-table-managed, .fitment-table-managed th, .fitment-table-managed td { border: 1px solid #ddd; border-collapse: collapse; padding: 4px 8px; text-align: left; font-size: 14px; }\u003c\/style\u003e\u003ctable class=\"fitment-table-managed\" data-fitment-source=\"turn14-app\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eTrim\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e2011–2016\u003c\/td\u003e\n\u003ctd\u003eFord\u003c\/td\u003e\n\u003ctd\u003eF-250 Super Duty\u003c\/td\u003e\n\u003ctd\u003eKing Ranch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2011–2016\u003c\/td\u003e\n\u003ctd\u003eFord\u003c\/td\u003e\n\u003ctd\u003eF-250 Super Duty\u003c\/td\u003e\n\u003ctd\u003eLariat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2013–2016\u003c\/td\u003e\n\u003ctd\u003eFord\u003c\/td\u003e\n\u003ctd\u003eF-250 Super Duty\u003c\/td\u003e\n\u003ctd\u003ePlatinum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2011–2016\u003c\/td\u003e\n\u003ctd\u003eFord\u003c\/td\u003e\n\u003ctd\u003eF-250 Super Duty\u003c\/td\u003e\n\u003ctd\u003eXL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2011–2016\u003c\/td\u003e\n\u003ctd\u003eFord\u003c\/td\u003e\n\u003ctd\u003eF-250 Super Duty\u003c\/td\u003e\n\u003ctd\u003eXLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2011–2016\u003c\/td\u003e\n\u003ctd\u003eFord\u003c\/td\u003e\n\u003ctd\u003eF-350 Super Duty\u003c\/td\u003e\n\u003ctd\u003eKing Ranch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2011–2016\u003c\/td\u003e\n\u003ctd\u003eFord\u003c\/td\u003e\n\u003ctd\u003eF-350 Super Duty\u003c\/td\u003e\n\u003ctd\u003eLariat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2013–2016\u003c\/td\u003e\n\u003ctd\u003eFord\u003c\/td\u003e\n\u003ctd\u003eF-350 Super Duty\u003c\/td\u003e\n\u003ctd\u003ePlatinum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2011–2016\u003c\/td\u003e\n\u003ctd\u003eFord\u003c\/td\u003e\n\u003ctd\u003eF-350 Super Duty\u003c\/td\u003e\n\u003ctd\u003eXL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2011–2016\u003c\/td\u003e\n\u003ctd\u003eFord\u003c\/td\u003e\n\u003ctd\u003eF-350 Super Duty\u003c\/td\u003e\n\u003ctd\u003eXLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2011–2016\u003c\/td\u003e\n\u003ctd\u003eFord\u003c\/td\u003e\n\u003ctd\u003eF250\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2011–2016\u003c\/td\u003e\n\u003ctd\u003eFord\u003c\/td\u003e\n\u003ctd\u003eF350\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cbr\u003e\u003cstyle\u003etable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; 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