--- product_id: 75992902 title: "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" brand: "powertrax" price: "626209CFA" currency: XOF in_stock: true reviews_count: 8 url: https://www.desertcart.sn/products/75992902-1840-lr-lock-right-differential-locker-35-spline-fits-ford store_origin: SN region: Senegal --- # Full-time automatic locking Fits Ford 10.25" rear axle 35 spline precision engineering 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 **Brand:** powertrax **Price:** 626209CFA **Availability:** ✅ In Stock ## Summary > 🔧 Lock in power, unlock your off-road potential! ## Quick Answers - **What is this?** 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 by powertrax - **How much does it cost?** 626209CFA with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/75992902-1840-lr-lock-right-differential-locker-35-spline-fits-ford) ## Best For - powertrax enthusiasts ## Why This Product - Trusted powertrax brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built to Endure:** Premium machined construction engineered for rugged off-road durability and reliable performance under pressure. - • **Plug & Play Upgrade:** Drop-in design replaces OEM and aftermarket parts like Eaton and Auburn Gear without hassle or extra parts. - • **Confidence in Every Mile:** Backed by a 2-year/100,000-mile warranty, ensuring your investment is protected on and off the road. - • **Unmatched Traction Mastery:** Full-time automatic locking delivers max power to both wheels, conquering any terrain effortlessly. - • **Seamless Ford Compatibility:** Direct fit for Ford F-250, F-350, E-Series, and Excursion with 10.25" open differentials—no carrier mods needed. ## Overview The PowerTrax 1840-LR Lock-Right Differential Locker is a robust, full-time automatic locking differential designed for Ford 10.25" rear axles with 35 splines. Compatible with popular Ford models like the F-250, F-350, E-Series, and Excursion, it offers a direct drop-in replacement for OEM and aftermarket parts. Engineered for durability and backed by a 2-year/100,000-mile warranty, it enhances traction and off-road performance without requiring carrier modifications. ## Description 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 ## 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. ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | Powertrax | | Brand | PowerTrax | | Model | 1840-LR | | Item Weight | 6.25 pounds | | Product Dimensions | 10.5 x 5.9 x 3.1 inches | | Country of Origin | China | | Item model number | 1840-LR | | Is Discontinued By Manufacturer | No | | Exterior | Machined | | Manufacturer Part Number | 1840-LR | | OEM Part Number | 544911, LBF10.25 | ## Images ![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 - Image 1](https://m.media-amazon.com/images/I/61UJ1rrnJ+L.jpg) ## Available Options This product comes in different **Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Looks like a quality lunchbox locker. *by A***R on April 13, 2025* Easy install. Have not used it offroad yet. ### ⭐⭐⭐⭐⭐ It’s a long review but worth a read *by P***P on November 18, 2023* 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. ### ⭐⭐⭐⭐⭐ Works fantastic *by A***. on March 17, 2023* 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. ## Frequently Bought Together - 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 - Lube Locker LLR-D030 Lubelocker --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sn/products/75992902-1840-lr-lock-right-differential-locker-35-spline-fits-ford](https://www.desertcart.sn/products/75992902-1840-lr-lock-right-differential-locker-35-spline-fits-ford) --- *Product available on Desertcart Senegal* *Store origin: SN* *Last updated: 2026-06-18*