Carli Progressive Leaf Spring Kit for 2017+ FORD F250/350 4X4 - 1" Lift

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Carli Suspension worked in conjunction with Deaver Leaf Springs to design a leaf spring pack to match Carli's 2.5″ and 4.5″ Suspension Lifts while providing a much more predictable and supple ride with only a slight reduction from a standard 3/4-ton load capacity. The factory leaf spring packs have 2-4 heavy main springs and an immobile lower overload making for a jarring ride; replacing them with Carli's 9-Leaf main pack and 3-Leaf overload provide much more spring rate progression. This makes for a softer unloaded ride, massive suspension travel increase and impressive capacity as the rear end compresses engaging all the springs.

The Carli Suspension Super Duty Full Spring Pack is designed and built to Carli's specifications supporting up to 15″ of wheel travel. The center-pin is relocated to accommodate (up to) 38 inch tires, 37″ recommended, and levels the rear perfectly to match Carli's 2.5″/3.5″ front suspension systems, respectively. This spring pack delivers smoother suspension cycling in all situations: highway, off road and towing.

• Block eliminating, Full Progressive Spring Pack
• Includes new U-Bolts and Rear Bump Stop Drops
• Provides a 1/2″, rear high stance to Carli Leveling Suspension Systems
• 37″ Tire Fitment
• Fitment: 2017-23 Ford F250/350 4×4, Diesel 3.5-4.0″ Axle Tube

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• Block eliminating, Full Progressive Spring Pack
• Heavy Duty Full Replacement Leaf Springs designed for those with constant 1,000lbs in the bed
• Includes new U-Bolts and Rear Bump Stop Drops
• Provides a 1″, rear high stance on Matching 2.5″ Leveling Suspension Systems
• 37″ Tire Fitment
• Heavy Duty Full Replacement Leaf Springs designed for those with constant 1,000lbs in the bed.
• Carli Full Replacement Leaf Springs are Designed to work with Carli's Custom Valved Shocks.
• The springs DO NOT work well with off-the-shelf Valving.
• 37″ Tire Fitment Based on Recommend Wheels Specification of no more than 9″ wide with 5-5.5″ of ckspacing.
• Fitment: 2017-23 Ford F250/350 4×4, Diesel 3.5-4.0″ Axle Tube

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As the “Overland” Market has grown, and with it, the different in-bed camper segments, we’ve found ourselves adapting. The “HD” spring can be pushed from it’s recommended 1,000lbs. but not by much. Plus, if you’re spending that kind of money on a custom spring pack, why settle for “almost” correct? We started with the TFL Truck. If you’re unfamiliar with them, The Fast Lane Truck is a popular YouTube truck-testing channel. We participated in the build of their 2020 F250 they equipped for their “No Pavement Needed” series in which they took a Carli Pintop equipped Super Duty across the country with a 4 Wheel Camper Hawk pop-up in the bed supported by Carli's “XHD” leaf spring pack.

The constant 1,800lb.-2,000lb bedload required us to build a beefier version of the HD leaf springs. With this leaf spring and the added spring rate, we require customers to run the Pintop (King 2.5″) shock package for which we’ve developed a custom shock tune refining the overall ride, handling, spring rates and heightened center of gravity that accompany a rig modified as such. The result can be seen in the MANY videos TFL published featuring this bad-ass rig.

• Block eliminating, Full Progressive Spring Pack
• Includes new U-Bolts and Rear Bump Stop Drops
• 37″ Tire Fitment
• Fitment: 2017-23 Ford F250/350 4×4, Diesel 3.5-4.0″ Axle Tube

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Overland with a large cab-over camper or build an off-road rescue rig, these XXHD leaf springs support a 3,500lb. constant bed-load. Custom designed originally for the guys at Motorsports Safety Solutions (First Responders in Off-Road Racing, see build article HERE), these leaf springs bolster the SRW F350’s max bed-load capability into a working load capacity that’s huge on travel and fully progressive. The truck for which they were built scaled at 11,740lbs (5,400 front, 6,340 rear). The build article linked has in depth measurements and pictures to show how truly massive these springs are.

Developed for the massive, flagship, off-road race-rescue truck, we’ve sold these springs to many customers with custom flat-beds and large, fixed campers. So long as you’re around the 6,500lb. rear axle weight (confirmed on certified scale), these will be the perfect means of suspending your adventure rig!

• Block eliminating, Full Progressive Spring Pack
• Includes new U-Bolts and Rear Bump Stop Drops
• 37″ Tire Fitment
• Fitment: 2017-23 Ford F250/350 4×4, Diesel 3.5-4.0″ Axle Tube