A couple of questions are frequently asked by customers is how to properly fill their Dynatrac ProRock® axle with gear oil, and which gear oil is best to use. Let’s dive right in!
First, they recommend a high-quality GL-5 mineral-based gear oil (not synthetic). In moderate to cold climates, use SAE 85/90. If you live in a hot climate, use SAE 85/140.
The specific fill procedure is a little different for the Dynatrac ProRock 44™ and the Dynatrac ProRock 60/XD60® axles. They go through each in the following sections.
Dynatrac ProRock 44™
With the axle installed under the vehicle and the vehicle sitting on level ground, remove both threaded plugs in the differential cover. The large, upper hole is the fill hole, and the small, lower hole is the fluid-level hole. Add oil through the upper hole until it starts to run out of the lower hole. Install both threaded plugs.
A typical ProRock 44™ axle will take approximately 2 quarts of oil.
Dynatrac ProRock 60/XD60®
The Dynatrac ProRock 60® and ProRock XD60® have a little different fill procedure. Many of these axles have an optional, patented Dynatrac Dual Sump High Volume (DSHV) system that provides additional lubrication to the pinion bearings. This must also be filled with oil when changing the oil in the axle or filling the axle with gear oil for the first time.
With the axle installed under the vehicle and the vehicle sitting on level ground, remove both threaded plugs in the differential cover. The large, upper hole is the fill hole, and the small, lower hole is the fluid-level hole. Add oil through the upper hole until it starts to run out of the lower hole. Don’t install the threaded plugs yet.
Wait for oil to stop coming out of the lower hole before moving on to the next step.
If your ProRock 60® and ProRock XD60® has DSHV system, there is a small threaded plug in the pinion section of the axle housing. Remove this plug and add gear oil. This fills the DSHV system. Stop adding oil when gear oil begins to come out of the lower hole in the differential cover.
Now you can install all three threaded plugs.
A typical ProRock 60® or ProRock XD60® front axle will take approximately 2.5-3 quarts of oil, while a ProRock 60® and ProRock XD60® rear axle.
A few things to keep in mind when filing any ProRock® axle with gear oil:
Dynatrac™ introduces the missing link in GM IFS truck drivetrain: the ProRock XD60-GM-IFS™ for the ultimate upgrade in front axle strength and durability. Developed for military applications, the ProRock XD60-GM-IFS provides unmatched strength and durability for 2007 and newer GM 2500 HD 4x4 trucks with Duramax and Allison transmission.
The core of the new Dynatrac ProRock XD60-GM-IFS is high-strength nodular iron center section. The XD60-GM-IFS features exclusive larger carrier and pinion bearings for even more strength. It uses a massive 10.1-inch ring gear compared to the factory 9.25-inch gear. Even more significant to durability, though, Dynatrac designed the new center section for world-class rigidity, increasing the stability of critical tolerances during high stress. This nearly eliminates the chance of gear failure caused by axle housing deflection.
The ProRock XD60-GM-IFS features optimal cast-in bosses for air locker and electric locker connections, and the mounting points for the housing are an integral part of the casting.
In addition to these engineering advancements in the center section, the Dynatrac XD60-GM-IFS features an all-new structurally-integrated differential cover designed to add strength to the overall housing. The cover is made from nodular iron, attaches with 7/16-inch Grade 9 fasteners and a captured O-ring seal.
The Dynatrac ProRock XD60-GM-IFS comes with 35-spline or 40-spline 4340 inner axleshafts and supports stock, 934 or Series-30 CV flanges. The ProRock XD60-GM-IFS accepts a full range of differentials, including air lockers and electric lockers. Gear ratios are available from 3.54:1 to 5.38:1.
The Dynatrac ProRock 60® for 2005-2015 Toyota Tacoma trucks offers the legendary strength of a Dynatrac axle housing and axleshafts in a Builder’s Kit. This high-pinion ProRock 60 housing features heavy-duty suspension-mount brackets jig-fitted and welded in place to bolt to factory suspension. The axles have the correct Toyota wheel bolt pattern to accept stock or common aftermarket wheels for these applications, and it is compatible with the ABS and the stability control system.
The ProRock 60 Builder’s Kit for Tacomas includes a high-pinion ProRock 60 housing, high-strength 35-spline axleshafts and Pro Series™ differential cover. This new axle includes the vital components and features that have made the ProRock 60 an icon in the industry:
The ProRock 60 Builder’s Kit is a significant improvement in rear-axle strength for Tacomas. It uses a 9.75-inch ring gear, compared to the stock 8.0-inch ring gear that comes in these trucks. The Dynatrac axleshafts are 35-spline, compared to the stock 30-spline shafts, and the Dynatrac shafts feature a unique heat-treat process for additional strength. The ProRock center section has Dynatrac legendary strength engineered into it, and the axle tubes have 0.3125-inch wall thickness, compared to 0.200-inch from the factory. The customer re-uses the brakes and ABS sensors, and he can either can supply the differential and ring-and-pinion gear of his choice to complete the axle assembly or order them separately from Dynatrac.
Dynatrac™ introduces a solution for IFS 4x4s and KOH competitors that delivers an unmatched combination of strength, durability, size and value. The all-new Dynatrac ProRock XD60-IFS™ will take the abuse of high-horsepower and high-traction off-road tires, letting competitors use the skinny pedal without fear of breaking the differential.
More than just legendary Dynatrac strength and durability, the XD60-IFS is also narrower than the competing axles at just 13.7 inches from flange-to-flange. This improves half-shaft angles and lets builders add suspension travel. The patented Dynatrac ProRock™ design also delivers best-in-class ground clearance and reduces the overall frontal impact area. It’s built to take impacts, so you can run a Dynatrac ProRock without a skid plate, freeing up even more ground clearance.
For over 25 years, Dynatrac has been the industry leader in high-performance axle and drivetrain assemblies. Dynatrac products are designed using the finest materials, processes and engineering available, and its products are backed by the best service and warranty in the business. From complete replacement ProRock axle assemblies to high-quality replacement and upgrade components, Dynatrac is committed to delivering the best performance, reliability and quality possible.
The new Dynatrac ProRock XD60-IFS starts with a centersection cast from high-strength nodular iron. Dynatrac designed the new centersection for increased rigidity, increasing the stability of critical tolerances during high stress for better durability, and it features exclusive larger carrier and pinion bearings for even more strength. The axle was designed to hold a larger differential and 10.1-inch ring gear. This is a reverse-cut, high-pinion ring gear, which is far stronger than the competition. The ProRock XD60-IFS also has optimal cast-in features for air locker and electric locker connections, and the mounting points for the housing are an integral part of the casting.
In addition to these engineering advancements in the centersection, the Dynatrac XD60-IFS features an all-new structurally-integrated differential cover designed to add strength to the overall housing anDyantrac ProRock XD60-IFS 017-2d to withstand brutal beatings in demanding off-road and racing conditions. The lower bolt heads are deeply embedded in the cover for skid protection, and the fasteners are the largest in the industry: 7/16-inch compared to conventional 3/8-inch. The RockRibs have been placed for optimal protection.
The Dynatrac ProRock XD60-IFS comes with 40-spline 4340 inner axleshafts and either 934 or series 30 flanges. The ProRock XD60-IFS accepts a full range of differentials, including air lockers and electric lockers. Gear ratios are available from 3.54:1 to 5.38:1. You can shop for the ProRock XD60-IFS by clicking here.
The Dynatrac AL-X Experimental axle explores the possibility of a lightweight, high-performance axle for the off-road industry. The Dynatrac AL-X is a product of the vast OEM engineering and testing resources of AAM combined with the off-road design and expertise of Dynatrac, resulting in an axle with industry-leading performance-to-weight ratio.
Features include:
Dynatrac™ continues to push the limits of innovation in axle assembly technology, with its all-new ProRock 80-IRS® Independent Axle Assembly. This is the evolution of the Pro60-IRS® and complements the ProRock XD60-IFS. The ProRock 80-IRS is designed to exceed the demanding needs of racing, military and commercial applications. It incorporates Dynatrac innovations from the company’s line of ProRock™ solid axles and the engineering and expertise that Dynatrac team brings to every project.
The ProRock 80-IRS packs incredible strength in a lightweight and easy-to-fit assembly, and it is made in the U.S. from all U.S.-made materials. The ProRock 80-IRS starts with the Dynatrac exclusive center section cast from nodular iron. This casting is designed to maximize ground clearance and strength. External mounting points allow the ProRock 80-IRS to be secured in the front or rear of common frame rail or tube chassis designs and narrow output flanges maximize half-shaft lengths to reduce operating angles. The ProRock 80-IRS features a massive 11.25-inch ring gear and 37-spline pinion, as well as 35-spline or optional 40-spline half-shaft flanges. The assembly is available with 934, Series-21 or Series-30 CV shaft interface flanges. Gear ratios ranging from 3.54 and 5.38 are available, and the ProRock 80-IRS will accept all popular open, limited-slip and locking differentials.
As the performance of specialty vehicles increases, so do the demands on the axle assemblies. Desert racing and rock crawling events, where massive tires go from air to ground repeatedly under power, shave the teeth off ring-and-pinion assemblies. Heavy armored military vehicles put incredible strain on IRS drive components. Commercial and racing applications simply wear out regular axle assemblies. The Dynatrac ProRock 80-IRS ups the ante in all areas of independent axle assembly strength without increasing weight or bulk. Whether you’re building high-speed desert racer, high-powered rock crawler or a wide variety of armored or specialty commercial vehicles, the Dynatrac ProRock 80-IRS will ensure you get there and back.
If you're shopping for an off-road axle for your Jeep, there are a lot of choices. They all promise to be a bolt-in and an upgrade to the factory axles, but don't be fooled: there are some key differences! If you're looking for a Dana 44 upgrade or the strength and durability of a Dana 60-based axle, here are some important questions you need to ask companies that you're considering:
1. Will your axle manufacturer spend the time with you before the sale to make sure you're getting the right axle and the right options for your vehicle and how you use it? Or do they have one flavor that is supposed to work for everyone?
2. Is your confidence in your axle's quality and performance assured because it is 100% manufactured and assembled in the United States? Don't get fooled by others with Chinese parts or weasel words like "assembled in the US."
3. Has your axle been designed from the ground up exclusively with components that are designed to work together? Some use components from other axles that are forced to work together.
4. For the life of your vehicle will you be able to service your axles with off-the-shelf components like brakes, bearings, races, and seals?
5. Can you be assured a "no-fault" warranty if you properly service and maintain your axles?
6. Will your axle be manufactured with built-in caster that will be correct for the setup of your Jeep? Or does it have one-size-fits-all frontend geometry?
7. Will your axle be made from 100% new parts and not with some parts that are recycled, refurbished or salvaged?
8. Will your new axle come with premium parts included in the price such as a nodular iron differential cover, ball joints and OEM-quality suspension bushings? Or will you have to pay extra for these items?
9. Has the casting for your new axle been engineered from the ground up for the type of abuse that off-roading dishes out?
10. With a looming rock approaching your investment, does your axle have the best-in-class ground clearance you need to keep from getting hung-up, stuck, or damaged? Only if it is a patented ProRock axle from Dynatrac!
You’re probably familiar with Dynatrac and its axles, but did you know that the company was the first to introduce a high-clearance differential housing for off-roading? In 2002 the ProRock 60® debuted and changed the off-road axle industry forever. The patented design of the ProRock 60 provides more ground clearance than a much weaker and less capable Dana 44 axle, and a full inch more clearance than a Dynatrac Pro 60™ or traditional Dana 60. This feature alone allows your 4x4 to keep moving forward up the trail, instead of hung up and stuck.
This was the start of the ProRock family of axles which all share these advantages:
Dynatrac continues to lead the way in high ground clearance, severe-duty axle assemblies for the off-road enthusiast market. The all-new Dynatrac standard-cut, full-float ProRock XD60® is the strongest and lightest axle in its class. This axle is designed specifically for Jeep Wrangler and 4x4 builds using 37 to 40-inch-diameter tires. The ProRock XD60 fills a need between the current ProRock XD60 semi-float and ProRock 80™.
The new Dynatrac ProRock XD60 starts with a highly engineered center-section cast from high-strength nodular iron. The patented ProRock® design provides the best ground clearance in the industry. The ProRock XD60 is 100 percent made in the USA.
This newest Dynatrac center-section uses a standard-cut ring-and-pinion gear set, providing maximum strength for rear-axle applications on 4x4 vehicles with large tires. The axle tubes have also been strengthened, using 4-inch outside-diameter tubing with various wall thicknesses. This combination of a larger diameter without excessive tube-wall thickness provides incredible strength without adding unneeded weight, making the ProRock XD60 the strongest and lightest rear axle in its class. Additional strength is provided through the Dynatrac full-float design that includes 100 percent USA-made 35-spline floating shafts; 40-spline shafts are available as an option.
The Dynatrac standard-cut, full-float ProRock XD60 is available with the same exclusive and revolutionary strength features of our ProRock XD60 high-pinion, reverse-cut axle introduced last year. Using CAD/FEA and advanced engineering tools, Dynatrac designed the new center-section for more rigidity, increasing the stability of critical tolerances during high stress for unmatched ring-and-pinion durability. It is also available with oversized carrier and pinion bearings, providing a 50 percent load capacity increase over standard Dana 60 bearing sets.
The ProRock XD60 is the only axle in its class specifically designed to support 40-spline chromoly axleshafts with a Dynatrac-exclusive 40-spline ARB Air Locker. This air locker is equipped with the industry’s first oversized carrier bearing trunnion, which will not deform nor cone-out under severe loads. Both 35- and 40-spline axleshaft and differential options are available in this same axle. This allows customers to upgrade to 40-spline shafts at a later time when their appetite for tougher trails increases with their skills and experience.
For more than 25 years, Dynatrac has been the industry leader in high-performance axle and drivetrain assemblies. Dynatrac products are designed using the finest materials, processes and engineering available, and its products are backed by the best service and warranty in the business. From complete replacement ProRock® axle assemblies to high-quality replacement and upgrade components, Dynatrac is committed to delivering the best performance, reliability and quality possible.
In 2003 Dynatrac was the first company to engineer the Free-Spin™ manual locking hub conversion kit to replace the problematic unit wheel bearings found on Ford Super Duty and Dodge Ram Heavy Duty 3/4 and 1-ton 4x4 pickup trucks. Unitized wheel bearings are especially prone to wear on lifted applications with bigger tires, and on trucks used for commercial purposes that see heavy-duty use all day, every day.
The Dynatrac Free-Spin locking hub conversion kit reduces parasitic friction and wear on the front axleshafts, ring and pinion, differential bearings, and front driveshaft and U-joints. Reduced friction equates to increased fuel economy and decreased drivetrain noise on the highway. The Dynatrac Free-Spin kit is the only locking hub conversion kit that is 100 percent made in the U.S.
Each Dynatrac Free-Spin kit features one-piece forged, heat-treated, solid chromoly, fixed spindles that simply bolt onto your steering knuckles in place of the unit bearings. These spindles provide greater wheel-bearing separation for longer bearing life and increased strength and durability. Unlike the stock unit bearings, the Dynatrac Free-Spin wheel bearings are completely serviceable. The bearings, races, and seals are all common over-the-counter components that you can find at your local auto parts store. The included Timken bearings ride in nodular-iron wheel hubs loaded with forged wheel studs. All Dynatrac Free-Spin bearings feature metal cages for the rollers that promote long life. Factory unit bearings have plastic bearing cages for the rollers, which can melt from heat when the grease becomes contaminated, causing the bearings to fail and your truck to become immobilized. New stub axles, also made in the U.S., are forged from double heat-treated chromoly.
Dynatrac Free-Spin kits are available with Warn or Dynatrac DynaLoc™ manual locking hubs. Like the rest of the kit, DynaLoc hubs are 100 percent U.S.-made. They feature a unique interlocking tooth design, which makes them three times stronger than traditional Dana 60 manual locking hubs. This is the first truly new locking hub design in 20 years. Internal gears are made from heat-treated chromoly steel with a special tooth design that won’t disengage under a high-torque load. DynaLoc manual locking hubs engage and disengage with only an 1/8 of a turn, and default to a locked position for reliable operation that will never leave you stuck and stranded.
The new DynaLoc™ 40-spline hub from Dynatrac brings complete hub-to-hub 40-spline strength to ProRock XD60™ and ProRock 80™ front axles. The Dynatrac DynaLoc hub design has stood apart from competitors since it was introduced in 2006, boasting more strength and unique features than any locking hub in the past 35 years. Dynatrac’s new 40-spline version sets new benchmarks for strength and durability, and further widens the lead DynaLoc locking hubs have over other brands. DynaLoc hubs are 100 percent made in the USA.
The Dynatrac DynaLoc 40-spline hubs are part of a complete 40-spline 1550 package for the ProRock XD60 and ProRock 80 front-axle assemblies, providing customers with unmatched strength from hub-to-hub. The key components in this ultra-strong package include:
This combination builds upon the unique strength characteristics that made the ProRock XD60 the strongest and lightest axle in its class. And no axle matches the ground clearance provided by the patented ProRock® design.
For more than 25 years, Dynatrac has been the industry leader in high-performance axle and drivetrain assemblies. Dynatrac products are designed using the finest materials, processes and engineering available, and its products are backed by the best service and warranty in the business. From complete replacement ProRock® axle assemblies to high-quality replacement and upgrade components, Dynatrac is committed to delivering the best performance, reliability and quality possible.
Dynatrac introduces 40-spline 1550 front axle shaft kits designed specifically for the ProRock XD60™ and ProRock 80™ front axle assemblies. The massive axle shafts are part of a complete 40-spline 1550 LT® package for these axles, providing customers with unmatched strength from hub-to-hub. And they are 100 percent made in the USA.
Dynatrac axle shafts are made from 4340 chromoly steel, and feature a proprietary heat-treating process to give them optimal torsional strength, while maintaining toughness and ductility to absorb shock loads that might otherwise damage differentials and ring-and-pinion gears. The one-piece forgings add significant reinforcement around the axle joint caps to protect against deformation under intense loads, a leading cause of steering-joint failure. The steering joints are 1550, the largest available in the industry. Steering angles up to 50 degrees are attainable with these Dynatrac shafts and 1550 LT wheel ends, giving customers a tight turning radius.
The Dynatrac 40-spline 1550 front axle shaft kit is part of entire system for the ProRock XD60, and is the only way to get true 40-spline strength hub-to-hub in a 60-based front axle assembly. The system includes:
This combination builds upon the unique strength characteristics that make the ProRock XD60 the strongest and lightest axle in its class. And no axle matches the ground clearance provided by the patented ProRock® design.
For more than 25 years, Dynatrac has been the industry leader in high-performance axle and drivetrain assemblies. Dynatrac products are designed using the finest materials, processes and engineering available, and its products are backed by the best service and warranty in the business. From complete replacement ProRock® axle assemblies to high-quality replacement and upgrade components, Dynatrac is committed to delivering the best performance, reliability and quality possible.
Dynatrac™ introduces front and rear JK44 Axleshaft Upgrade Kits for the 2007 and newer Jeep Wranglers (JK). These kits are made in the U.S., and they provide an affordable way to significantly increase the strength of factory Dana 44 axles (and ProRock 44™ front axles) with high-quality Dynatrac components. The Dynatrac JK44 Axleshaft Upgrade Kits come with everything you’ll need to replace and upgrade the factory shafts.
The front Dynatrac JK44 Axleshafts are made from high-strength 4340 chromoly. These 30-spline shafts come with 1350 U-joints, and are a direct fit to retain the factory wheel hub. They fit in both Dana 44 and Dynatrac ProRock 44 axles without any modification to the housings.
The rear JK44 Axleshaft Upgrade Kit increases the shaft diameter to from 32- to 35-spline. The shafts feature Dynatrac proprietary deep heat-treat for optimum yield strength (resistance to twisting) without making the axleshafts brittle. The shafts are U.S.-made, equipped with rolled splines and include new wheel studs, billet steel retainers, seals and all of the hardware that will be needed for installation.
The front and rear Dynatrac JK44 Axleshaft Upgrade Kits are ideal for Jeep Wranglers being upgraded with a Dynatrac ProRock 44 housing and retaining the rear factory axle, or those who aren’t quite ready for a ProRock 44 and want to add as much strength as possible to a front and rear set of factory Dana 44 axles.