When your off-road vehicle looks brown instead of its original color, you know you've had a successful off-road adventure. On other days when you're not satisfied with your ride's performance, you may consider modifying the vehicle by adding a crawler box to enhance it. 4 Wheel Parts has you covered by offering the best selection of aftermarket parts for great prices.

Tough Parts for Great Performance
On some days you feel like your off-road vehicle gives a great performance, but most days you find it lacking. Your dream is to install a NP231 crawl box to solve performance problems without altering the drivetrain, and you turn to 4 Wheel Parts to help you realize that dream.

We carry a wide selection of the best aftermarket parts available for off-road vehicles. We have all of the crawler boxes, adapters, control modules and switches you need to enhance your ride's performance. Because we know that only top-quality parts can hold up under the intense pressure of off-roading, we only offer parts from brands like Advance Adapters. Made from the best materials, these parts allow you to feel confident in the performance of your new NP271 transfer case.

Low Prices To Help Your Budget
At 4 Wheel Parts, we don't want you to sacrifice quality for price and settle for buying a used Atlas transfer case. With decades of experience in the automobile industry, we understand quality, but we also know the strain that modifications put on your budget. To help you enhance the performance of your vehicle, we are dedicated to providing you with the lowest price you can find for a Jeep Atlas transfer case. We even have a price-matching guarantee in place so you feel confident when shopping with us.

We don't want to serve you by only offering quality parts- we also strive to provide you with superior service. Trust us to help you find the perfect part for your vehicle, or ask us for installation advice. We are more than happy to help, so shop with us today.

For off-roaders looking for new challenges, a wide range of options and extreme terrain, rock crawling beckons. Crawling over rocks and boulders requires precision, planning and a good spotter. Climbing a mountainside, especially those that are steeper than 45 degrees, and stairs call for low gears, torque and a decent crawl ratio. A low-range transfer case with an NP231 crawl box means the crawl-ability improves and stalling is a thing of the past.

Rock Crawling Essentials
A low crawl speed, a good set of lockers and aggressive bias ply specialty tires can up your game out on the rocks. A crawl box increases the rig's performance without making extensive drivetrain changes. The added low range provided by the crawler box combines with the existing range for improved performance easing over obstacles. The right aftermarket parts give you more control of the vehicle in extreme conditions.

Rock Crawling Ratios
Crawling leaves the undercarriage susceptible to dings, dents and punctures. Relying on momentum to conquer this type of terrain can be catastrophic. Going too fast over rocks and boulders can severely damage your rig, putting an abrupt end to the fun. Low range gearing enables forward motion on gnarly inclines. When the engine spins faster than the axles, torque increases, even at very low speeds. The 231 crawl box is effective for light truck applications. The 242 is the most robust version and includes ultra-low gearing.

Rock Crawling Inventory
At 4WheelParts.com, we have the components you need to upgrade your ride. Adapters, control modules and kits to enhance wheeling performance are in stock and ready to ship. These parts are vehicle specific, so check the model to ensure they fit the make and model you have. Order today and our six warehouses ensure the parts are delivered fast. If you have questions, our friendly knowledgeable customer service center staff can answer your questions to get you back on the trail.