Providing height adjustability, dual front shocks and ultimate bottom-out resistance, the Coilover Bypass kit is the best option for the avid off-roader. 2.5" Coilover and 2-Tube, 2.5" bypasses adorn the front wheel well, while 3-Tube Rear Bypasses and Full Progressive Leaf Springs round off the rear. This system maintains great on-road manners and is the most off-road capable of our 2.5" lift lineup.
Shock Diameter - 2.5"
Lift Height - 2.5"
Tire Size - Up To 35"
Front Travel - 8"
Rear Travel - 12"
Base Kit Includes:
CS-FCO25SPKG-BYP-LVL-05 - Carli Custom Tuned KING 2.5" Remote Reservoir Coilover Shocks, 2-Tube Front and 4-Tube Rear Bypass Shocks with Stainless Shafts & Reservoir Mounts
CS-FCOMKIT-05 - Upper and Lower Coilover Conversion Brackets and Hardware
CS-FORDBBL-05 - Brake Lines
CS-FCASTERSHIM-25 - Caster Shims
CS-FPRB-05 - Track Bar
CS-FBDF05-25 - Front Bump Drop Pucks
CS-SRM-25 - Short Reservoir Mounts
This is one of our most capable off-road systems. Similar in street ride to the Coilover and Pintop kit with seemingly no bottom, we spec’d this system with King 2.5” Front Coilovers, 8” Stroke 2-Tube Front Bypasses, 12” Stroke Rear 3-Tube Bypass with an oversized rebound tube. This system is also height adjustable approximately 1” to compensate for large bumpers/winches.
For those unfamiliar, a bypass shock has external tubes with one-way check valves that are fully adjustable to allow users to tailor the amount of fluid that bypasses the piston/valving on either the compression or rebound stroke within the effective range of the bypass tube. Typically, there will be a tube surrounding the compression zone at ride height that will allow fluid to freely move around the piston giving a supple ride. Once a large hit is encountered, the piston will move upward closing off the port, thereby forcing all fluid through the valving which substantially increases the shock’s resistance in this secondary zone. This acts as an internal bump-stop of sorts and gives tunable progression to the shock making it the perfect dual purpose setup.
Conversely, on the rebound side, we normally spec tubes that are oversized and deep in the travel stroke to allow a high volume of oil to bypass ensuring the shock shaft comes out quick enough to maintain contact with the ground (doesn’t get hung-up in the bump-zone after a large hit). As the shock extends and closes off the rebound tube, all the valving on the rebound side engages to slow the shaft as it reaches maximum extension, top-out. Simply put, the larger the shock diameter, the more capable the setup; the more tubes and “zones”, the more adjustability; the larger the tubes, the more fluid can flow around the piston and the more valving you can run to increase the stopping power in the “bump-stop” or “top-out” zone.
The Coilover/Bypass system boasts Carli specific, blueprinted, King 2.5” shocks on all four corners. In an effort to provide customers with the best product, we designed a custom piston to determine proper base flow rates to ensure the shock works well in the heavy duty truck platform; we then tuned the shocks around the custom pistons based on the only thing that matters to us, seat-of-the-pants feel. We round off ALL our King shocks with shafts machined and polished from a solid piece of 17-4 Stainless. Unlike King’s standard shafts, there is no coating to wear off, weather can’t hurt them and if there is a small chip, you can round the edges with emery cloth to ensure the seal housing isn’t damaged as they’re not brittle like the stock, hardened shafts. The shocks are finished with King oil good to -55° F. Note that all King shocks are built with a plated steel body. If subjected to inclement weather for extended periods, we recommend wrapping your shocks in 3M to provide a moisture barrier that’s replaceable.
The truck will sit 2.5” higher in the front and have more wheel travel thanks to the Coilovers. Stainless Brake Lines and an Adjustable Track Bar round off the front end geometry correction while Caster Shims improve on the stock handling. The rear is outfitted with a block eliminating Full Progressive Spring Pack lifting it 2” requiring no block to achieve proper ride height in the rear. The result is extended travel and a softer ride while wheel hop/axle wrap are minimized at the cost of 15% less load capacity than a stock F250.
Wheel and Tire:
On our 2.5” Ford Bypass Equipped Systems, we recommend 17”-18” wheels, no more than 9” wide with 5” of backspacing with Carli Fabricated Radius Arms. Tires, 37x12.5” will fit with some trimming; 35” will likely fit without trimming. The more rubber, the better the small bump compliance will be at proper inflation pressures. The ride will firm up as you go larger in wheel diameter. For more details, see our article on wheel and tire selection and tire pressures.
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