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PowerTrax

PowerTrax 1840-LR Lock-Right Differential Locker, 35 Spline, Fits ford 10.25", Rear, Open Differential, Compatible with ford F-250, F-350, E-Series, Excursion

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Availability: In Stock.
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Arrives Friday, Mar 20
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Style: Ford 10.25" (10 1/4") 35 Spline Axle 12 Bolt Differential (1840-LR)


Features

  • PowerTrax 1840-LR Differential Locker Designed for ford 10.25" Open Differential, 35 Spline; Improves traction and off-road performance; Strong, durable construction for reliable operation in harsh conditions.
  • Compatible With Multiple ford Models Fits ford F-250, F-350, E-Series, Excursion; Ideal for full-floating axles; for use in 10.5" if 3-pinion carrier is replaced with 2-pinion carrier (E7TZ4204C).
  • No Clutch Packs or Friction Plates Unlike LSDs, it provides full-time automatic locking, offering maximum power to both wheels; Drop-in design ensures simple installation without modifying the carrier.
  • Replaces OEM & Aftermarket Parts Direct replacement for Eaton 225SL56A, Auburn Gear 542089, Spicer 73109X, PowerTrax GT101035, ARB RD140; Ensures compatibility with factory axles and gear setups.
  • Backed by 2-Year/100,000 Mile Warranty Manufactured with premium materials for durability and reliability; Designed for rugged applications, delivering consistent performance on and off the road.

Description

PowerTrax 1840-LR Lock-Right Differential Locker – ford 10.25" 35 SplineUpgrade your vehicle's traction with the PowerTrax 1840-LR Lock-Right Differential Locker. Engineered for ford 10.25" Open Differentials with 35 Spline axles, this locker enhances off-road capability and ensures maximum power distribution.⚙️ Features & Benefits:🔹 Drop-In Installation – No modifications needed, making installation quick and hassle-free.🔹 Maximum Traction – Locks automatically to send equal torque to both wheels for enhanced performance.🔹 Durable Construction – Built with premium materials to withstand extreme conditions.🔹 No Clutch Packs or Friction Plates – Eliminates wear and tear, ensuring a maintenance-free experience.🔹 Designed for Open Differentials – Compatible with 10.25" ford rear differentials; Can be used in 10.5" with a 2-pinion carrier swap.🚗 Applications & Compatibility:✔️ Fits ford F-250, F-350, E-Series, Excursion (various years)✔️ for full-floating axles only; Compatible with factory and aftermarket gear ratios✔️ Works in open differentials only, not compatible with LSDs🔄 Replaces OEM & Aftermarket Parts:✔️ Eaton: 225SL56A✔️ Auburn Gear: 542089, 544911, 546089✔️ Spicer: 73109X✔️ PowerTrax: GT101035✔️ ARB: RD140🔧 Warranty & Reliability:Backed by a 2-Year/100,000 Mile Warranty, PowerTrax ensures durability and performance. Designed for rugged use, this differential locker delivers reliable traction for both on-road and off-road driving.🔥 Why Choose PowerTrax?✅ Industry leader in traction-enhancing differentials✅ Proven technology for off-road, performance, and daily driving✅ Easy-to-install solutions designed for maximum reliabilityUpgrade your ford 10.25" differential with the PowerTrax 1840-LR Differential Locker and experience superior traction today!

Manufacturer: ‎Powertrax


Brand: ‎PowerTrax


Model: ‎1840-LR


Item Weight: ‎6.25 pounds


Product Dimensions: ‎10.5 x 5.9 x 3.1 inches


Item model number: ‎1840-LR


Is Discontinued By Manufacturer: ‎No


Exterior: ‎Machined


Manufacturer Part Number: ‎1840-LR


OEM Part Number: ‎544911, LBF10.25


Date First Available: February 27, 2014


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Mar 20

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

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Top Amazon Reviews

    • Works fantastic
Style: Chrysler 9.25" Rear 31 Spline Axle Diffe...
Review Image by Alex K. Alex K.
The media could not be loaded. Pros -it works great off road and in the snow, totally locks the diff up, easy to install. IMPORTANT axle end play specs, set them right!! Wife drives the vehicle and doesn’t notices it. on road works well also. Cons - install manual sucks, clunky at times, hard on tires. It is easy to install. Unfortunately in the Chrysler 9 1/4 diff I installed this on came with Posi case. And the original part I ordered was the one for the Posi case. I didn’t fit, called tech support to verify I had the right part, they were quick to help. Unfortunately I had to order this locker along with new open case $135 new spider gear set $70 “just for the shims” the backlash adjustment tool $25 bearing set $100, fee to get the bearing pressed on $40, and backlash gauge for $30. I installed this on a 1999 Durango 4wd. The installed required a lot more work also had to weld the abs/speed tone ring to the case because when installing the original ring gear to the new open case. The tone ring had enough clearance to spin free. Time consuming and annoy. But the locker works fantastic. On road it’s mildly noticeable clicking around turns and clunky at times. But overall not a big deal, my wife drives the Durango often and has never complained about it. Video upload was with vehicle in 2wd. ... show more
Reviewed in the United States on March 17, 2023 by Alex K. Alex K.
    • Good for burnouts
Style: Ford 8.8" 31 Spline Axle 3/4 10 Bolt Dif...
Review Image by Phillysteak18 Phillysteak18
Directions could be clearer, but after some thinking and video watching, once installed, the locker works perfectly! And for anyone looking for a locker to do some burnouts with, this will work!
Reviewed in the United States on October 17, 2025 by Phillysteak18 Phillysteak18
    • It’s a long review but worth a read
Style: GM 8.5" 28 Spline Axle 10 Bolt Different...
Review Image by Phillip Phillip
Installed in a 8.5 10 bolt open carrier. Went into a c10 with 5.3 4L60 and 275/60/15s. Install was breeze, just go read Motortrends install write up and it’s smooth. I was able to push the springs in the just my fingers and it went fine. I did install with the ring gear on but out of the truck, but doing it while still in the carrier wouldn’t be an issue either. TIPS FOR C CLIP AXLES—Just be patient, work the axles back and forth while holding clips in and you will eventually get the spacers in to cover the clips. I used a knife in the center, it’s a pain in the a..but keep working with it. I used 2.25ish quarts of 80w90 Lucas, I do have turndowns but I heard the clicking a couple times but nothing bad. If you’re around 10ish percent throttle, you may can take a sharp corner while clicking but it could lock halfway through. Again, not bad, I dig it actually. Second, when you let off the throttle, then get back on it, it may feel a little odd..a shimmy maybe but you don’t even have to touch the wheel. It’s not bad at all. If you’re getting this for the street, I strongly recommend just be sure to understand the trade offs ( chirping sometimes, a clunk or two some, clicking) If it’s chirping in a corner, it’s very easy to just throttle up a bit and it’ll spin on up easier than you think. Just don’t fear a locker, get it! I will update if any issues arise. ... show more
Reviewed in the United States on November 18, 2023 by Phillip Phillip
    • Last 8 months
Style: Toyota Tacoma 8.4" 30 Spline Axle 12 Bol...
Review Image by H. H.
Review Image by H. H.
Review Image by H. H.
Review Image by H. H.
Review Image by H. H.
I have a 1998 Toyota T100, 4x4 with the 8.4 axle. I was looking for a new solution to replace my stock open differential once it finally gave up after 26 years of solid use. Came across this PowerTrax 1615-LR Lock-Right Differential Lock Assembly. $300+ was a good price. Locks up in off road use and should lock/unlock on the street. Easy installation. Had a shop look over my work and they said it looked good. Seemed to work pretty good the first 2 months. Did the break in period, swapped out the diff oil. Did everything you're supposed to do. Then I started to get some slamming coming out of the rear differential. Felt like someone was crashing into the back of my truck. Asked many of knowledgable people about how these worked and if that kind of clacking and punching was common and they all said, "Yea. Those things are notorious for all kinds of weird sounds and actions." So I continued to use it. Well, as of 10/25/24 (8 months since I bought it), I'm replacing it with an electronic locker. As you can see from the picture, all the teeth are rounded off and the pins and springs seats are broken. Showed the gear and axle shop my differential and they said that this is common for these kinds of lockers. ... show more
Reviewed in the United States on October 30, 2024 by H. H.
    • Improved off road handling at the expense added noises and handling on tarmac
Style: Suzuki 6.9" Front | Rear 22/26 Spline Ax...
Lock Right is a great invention. Simple yet very effective off road. It eliminates the weak point of a differential off road; transmitting the torque to the wheel with the least traction and causing you to stall. There are 2 forces that influence the Locker. One is delivered from the engine through the drive shaft, the other comes from the wheels due to different rotation speeds. The first force causes the Locker to lock while the latter causes it to unlock. Off road, where there is little traction, the force coming from the engine “prevails”, locks the Locker and ensures that torque is delivered to the wheel that is on the ground keeping you moving forward. On tarmac the situation is different especially during turning. Here you need to be very careful with the accelerator. The wheels’ uneven rotation tell the Locker to unlock. However, if you press the accelerator, the drive shaft tells the Locker to lock and now you have a fight. This fight is translated into loud knocking sounds that are unpleasant at best but can also cause vigorous rocking of the car (especially in manual gear transmission). By the way, normal behavior while turning is a clicking sound, which means the Locker unlocks. This is one sound that you need to get used to. I did not drive yet on wet tarmac, but I imagine you need to be extra careful during turning since there is not enough road traction to unlock the Locker and you might have to deal with a spinning car. Bottom line. If you can live with the disadvantages of the Locker in day to day driving in order to have better off road experience, install it. ... show more
Reviewed in the United States on March 30, 2013 by Menahem Yaniv
    • Check to make sure it works on your model
Style: Dana 41 | Dana 44 10 Spline Axles Differ...
Nice locker, however, it did not fit my Jeep as advertised. My jeep is a 1962 and at some point, they changed to a 19-spline axle instead of a 10 Spline axle. No one's fault just changes in parts by the MFG that was not listed on some early models. I would recommend it to anyone that needs a locker. Very heavy and robust. It also works on the split axle with the space in between the axles. ... show more
Reviewed in the United States on July 1, 2024 by van howard

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