Rusty's JL Wrangler 3.75" Advanced Kit

Description

Rusty’s 3.75" Advanced Kit for the JL Wrangler was specifically developed to deliver the on-road performance people expect from the JL combined with the ultimate flex and control off the pavement. We weren't the first JL kit to be released, but we feel we have the best. Where others rushed their prototypes to market with little to no testing, we invested the time and effort to thoroughly test everything. The result is what we feel is the best kit in the industry, and there's no need to accept anything less.

In late 2017 we started on coil spring and shock designs as we got small bits of information. In late January 2018, we received our first Rubicon and a Sport, this is when we got ready to get to work. With the Jeep JL being totally redesigned from the departing JK Wrangler, everything was different. Ride quality, handling, and suspension travel were greatly increased on the new JL Wrangler, but it also meant that nothing that was learned from the JK applied to the JL. It was our job to design a coil spring that would ride as good if not better, not lose any of the outstanding road handling manners, increase the lift height for larger tires and add more suspension travel. We knew the challenge ahead of us wasn’t going to be quick, nor was it going to be easy. We also spent countless man hours on the computer designing with 3-D modeling. Now with over a year in design and real-world testing, we feel we have designed and engineered one of our best kits yet.

We developed a dual rate progressive front and rear coil spring. These springs were started from scratch and are a totally different design and spring rate from the departing JK. This extensive development takes time and is costly to design and build. Beware of many manufacturers and their one-size-fits-all mentality by using springs that are designed for other applications. It's certainly cheaper to borrow designs from previous platforms, and it gets you to market more quickly, but that doesn't make it right. Rusty’s JL coils springs were developed corner-specific, meaning that every spring is different on each corner of the vehicle, just as built from the factory. Corner-specific springs mean you can be assured the ride height of the vehicle will be correct, with no cheesy offset spacers needed to keep the vehicle level or reduce spring bowing. The Rusty’s 3.75" kit will give you the clearance on a JL Wrangler to fully flex it with 37-inch tires off road and not have any fender rub, no inner fender rub. You can also easily run a 40-inch tire but bump stops are recommended for vehicles going off road.

KEY FEATURES:

Progressive Dual-Rate Coil Springs Front and Rear
Coils specifically developed from the JL, not borrowed from previous platform designs
Maintains factory ride quality while making room for a larger tire and wheel package
Adjustable upper and lower control arms with Forged Flex Joints front and rear for the ultimate in adjustability and flex
Extended front and rear sway bar links maintain factory sway bar functionality
Available shock absorbers are tuned to work with spring rate

Front Progressive Rate Coil Springs
Rear Progressive Rate Coil Springs
Adjustable Front Upper Control Arms with Forged Flex Ends
Your choice of Adjustable Front Lower Control Arms with Forged Flex Ends or Forged Rubber Ends
Your choice of Adjustable Rear Upper Control Arms with Forged Flex Ends or Forged Rubber Ends
Your choice of Adjustable Rear Lower Control Arms with Forged Flex Ends or Forged Rubber Ends
Adjustable Front Track Bar
Adjustable Rear Track Bar
Front Track Bar Frame Mount Brace
Front and Rear Extended Sway Bar Links
Front Brake Line Extension Brackets
Front Upper and Lower Coil Spring Isolators
Front Lower Coil Spring Retainers
Rear Lower Coil Isolators

You do not need to buy a new driveshaft to install this lift kit. While there is a lot of talk about it, we've had many customers run this lift on a Jeep JL with their stock driveshaft without any problems. Whether or not you'll need an upgrade depends entirely on how you use your Jeep. If you frequently tackle harder off-road trails and conditions, the stock driveshaft will wear out faster, just as it would even without a lift. When that time comes, we recommend replacing it with an aftermarket heavy-duty (HD) driveshaft. Rusty's offers a complete line up of HD driveshafts for when you're ready.

Click to download installation instructions