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Marlin has been experimenting and building differentials since the 1970s. His unique gear setup procedure and high quality parts have created a legendary reputation. We combine our decades of experience with our high quality parts to provide the longest lasting differentials available.
Every differential we build includes the following components:
- Marlin's Exclusive Setup-Up Procedure
- High Quality Yukon Ring & Pinion Gear Set
- Genuine Toyota Japanese-made
KOYO & NSK bearings - Heavy Duty Marlin Crawler EcoSeal Pinion Seal
- Heavy Duty Marlin Crawler Solid Pinion Spacer
- Multi-pattern Pinion Flange
- High Quality Yukon Setup Kit
Having a properly setup differential can make a night and day difference in both the performance and the reliability of your truck. As discussed in detail on our Locker page, traction can be greatly increased with the addition of a locker. Most importantly, having your differential setup properly with the correct pinion-to-ring gear engagement is the difference between lasting 50 miles or 50,000 miles.
to be recognized by Yukon as the #1 top distributor and
builder of high quality Toyota differential products!
If you want to install and never worry about it again,
then run a Marlin Crawler Differential.
Curious how changing your differential ratio will affect your engine and truck's highway speeds? Use our below calculators to get a basic idea of the characteristics with your new differential setup.
Engine RPM Calculator
| R&P |
Tire Size |
Transmission Gear |
Truck Speed MPH |
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Engine RPM |
Truck Speed Calculator
| R&P |
Tire Size |
Transmission Gear |
Engine Speed RPM |
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MPH Truck Speed |
Grizzly Equipped
This is the strongest automatic locker we offer. Using modern technology, the Grizzly Locker is designed from the ground up with a patent-pending internal locking mechanism providing unmatched strength. It's advanced design has resulted in a robust yet easy-going product. Compared to other automatic lockers, the Grizzly Locker has a softer engagement/disengagement thanks to a freely-rotating component design complete with an improved teeth engagement profile. Comes with a one year unconditional warranty!
Zip Air Locker Equipped
The Zip Air Locker is a selectable locker similar in design to the ARB Air Locker, but at a more competitive price. The Zip Locker is based on a proven design that Marlin has used since the late 1980's, but yet it features a strong forged nodular case with high-nickel 4320 Chromoly steel internals for increased strength. The Zip Locker works with air pressure and fully locks or unlocks your differential at the flip of a switch. Recommended for any type of Rock Crawler, and comes with a one year warranty!
ARB Equipped
The ARB Air Locker is a selectable locker that is made in Australia. ARB has an extensive reputation for making high quality products that have been featured in all levels of off roading. Developed in the early 1980s, the ARB Air Locker uses air pressure to engage and fully lock both drive axles for maximum traction. The locker is operated by an interior mounted switch. On board air is required as well as solenoid and switch wiring.
Detroit Equipped
The Detroit Locker is an automatic locking differential that provides ultimate traction for mild to extreme vehicle applications. Its unique, bullet-proof design is engineered to keep both wheels in drive mode – even if one wheel is lifted off the ground. It works in forward and reverse, and features unmatched strength. It is 100 percent automatic locking and is a maintenance-free design.
Truetrac Equipped
The Truetrac is a helical-gear style, limited-slip differential that maximizes wheel traction and enhances driving characteristics. Maintenance-free, it features smooth, automatic operation in forward and reverse. Its versatility makes Truetrac the ideal traction solution for almost any type of vehicle.
Spartan Equipped
This is a low-cost automatic locker that packs a big punch. Like the Grizzly, the Spartan Locker is an improvement upon older designs. Made in the USA, it features a revolutionary spring-and-pin design that makes it stronger than other low-cost automatic lockers. Recommended for lighter vehicles with 35" or smaller tires.
Spool Equipped
This is the Yukon Spool Locker. Yukon builds the strongest and longest lasting spool lockers we've ever seen. Made from high quality 4130 Chromoly steel, we firmly believe this is the strongest and longest lasting spool locker on the market today. The Yukon Spool Locker features a solid, one-piece construction that transfers 100% power to both tires at all times. This is a simple and inexpensive setup that will continuously and fully lock your differential for maximum traction. Please note that we do not recommended spool lockers for on-road use. Please read our Spool Locker Info for safety and usage information.
Toyota Electric Equipped
The Toyota Electric Locker is a selectable locker that may require axle housing modifications. Made by Toyota and offered on 1993 & newer model trucks, the "E-Locker" uses an electric motor and worm drive assembly to engage or disengage the locker via a shift fork and collar. It is a reliable and popular choice and is offered in standard or high pinion configurations. It's proprietary design is only compatible with trucks originally factory equipped with the E-Locker. It is common for older trucks and trucks not originally factory equipped to use the E-Locker, however, axle housing modifications and custom wiring will be required for these applications.
Open Carrier
Sometimes customers just need a fully rebuilt & long lasting high quality open differential from us. We've been building open diffs since the last century and we are happy to now offer complete open differentials on our website. We offer many different applications with gear ratios ranging from 4.11:1 to 5.29:1. We stand behind our differentials and know you will not find a better built differential on the market. Put our diffs to the test!
Please click here to view our important differential break-in information.