Fox, King and Icon share the same part numbers for the Trail Boss/AT4 and the base models. Bilstein is the only manufacturer that has specific part numbers for the Trail Boss/AT4. The Trail Boss/AT4 came from the factory with a 2” lift in the front and 1” in the rear. The biggest difference between the Trail Boss/AT4 and the base models is going to be the suspension. This is going to be your mid range compression adjuster offering 10 levels of adjustment to get you dialed in for any street or dirt driving you plan on doing.įrequently Asked Questions Whats the big differences between the Trail Boss and AT4 models compared to base Silverados and Sierras? Can the suspensions be shared? With the Stage 4 system you get Icons tried and true CDCV valve. Now if adjustability is what you are after, look at the Stage 4 system. Stepping up to the Stage 3 system, you will get the same coilovers in the front, but with the added reservoir and the rear shocks get upgraded to 2.5 series shocks with piggyback reservoirs. Icons Stage 2 kit features a 2.5 series extended travel non reservoir coilover for the front and 2.0 series rear shocks. These stages will also include the option of having a steel tubular UCA or a nice looking billet aluminum UCA, with both featuring Icon's popular Delta Joint. These systems will offer up to 1.5” of additional lift height over the factory setup. If you are looking to add some additional height to your Trail Boss or AT4, you will want to look at the Stage 2 or higher suspension systems. With this being said though, everything in their stage series is available for purchase separately. This made it easier on the customer to pick something in their budget. Icon Vehicle Dynamics was the first suspension company to introduce their Stage series of suspension systems. Your low speed compression will be your slower shocks shaft movements (body roll, brake diving, g-outs at the transition of a sand dune) while the high speed compression adjustments allow you to tune for the faster shock shaft movements (washboard roads, potholes). ![]() With the DSC adjusters, you are able to adjust the high speed compression and the low speed compression independently to really dial in the ride quality for the specific terrain that you are going through on any given trip. With the Performance Elite line of Fox shocks you are getting a CNC machined 2.5” diameter body along with reservoirs and Fox’s Dual Speed Compression (DSC) adjusters. The aluminum shock bodies are going to help with the heat dissipation without the need for an external reservoir.įox took this a step further with the new addition of their Performance Elite 2.5 series. For customers looking to keep factory height, but improve off road ride quality while keeping the budget low, the Performance 2.0 is the ticket for you. 2” factory lift over the Non Trail Boss and AT4 modelsĮxisting lift system being replaced by aftermarket options, stacking lifts, upper arms.įox offers both their Performance 2.0 and Performance Elite Series 2.5 options for the Trail Boss and AT4’s.With the new Trail Boss and AT4 packages, GM gave customers a 2” lift in the front and a 1” lift in the rear supported by Rancho monotube struts and shocks tuned specifically to GM’s specifications, higher angle CV axles to accommodate the extra lift and factory 275/65 R18 tires. Chevrolet did offer a Trail Boss package in 2016 but that was short lived and only offered for 1 year before being discontinued. GM took these upgrades further with the introduction of the Trail Boss and AT4 Packages. In the 2019-2021 Silverado 1500 Z71 and the 2019-2021 GMC Sierra 1500 X31 packages, customers were given a dual speed transfer case, steel skid plates, Hill Descent Control, All Terrain tires and Rancho Twin Tube shocks. The Chevrolet Z71, X31 for the GMC trucks, packaged some off road oriented upgrades over the LT and SLE model trucks.
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