--- product_id: 785655047 title: "40k Transmission Oil Cooler lpd47391" brand: "lucky seven" price: "₩497192" currency: KRW in_stock: true reviews_count: 5 category: "Lucky Seven" url: https://www.desertcart.kr/products/785655047-40k-transmission-oil-cooler-lpd47391 store_origin: KR region: South Korea --- # Low pressure drop design 40,000 GVW max capacity No assembly required 40k Transmission Oil Cooler lpd47391 **Brand:** lucky seven **Price:** ₩497192 **Availability:** ✅ In Stock ## Summary > ❄️ Keep your transmission chill, even under pressure! ## Quick Answers - **What is this?** 40k Transmission Oil Cooler lpd47391 by lucky seven - **How much does it cost?** ₩497192 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/785655047-40k-transmission-oil-cooler-lpd47391) ## Best For - lucky seven enthusiasts ## Why This Product - Trusted lucky seven brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Trusted Durability:** Engineered for long-lasting transmission protection - • **Compact & Lightweight:** Sleek 10.2 x 7.6 x 7.6 cm design at just 113g - • **Effortless Installation:** Comes pre-assembled for a hassle-free setup - • **Heavy-Duty Cooling Power:** Handles up to 40,000 GVW for serious performance - • **Optimized Flow Efficiency:** Low pressure drop keeps your transmission running cooler ## Overview The 40k Transmission Oil Cooler LPD47391 by Lucky Seven is a compact, heavy-duty cooler designed for vehicles up to 40,000 GVW. Featuring a low pressure drop design and no assembly required, it ensures efficient heat dissipation to maintain optimal transmission temperatures during demanding drives. ## Description 40k Transmission Oil Cooler lpd47391 Compatible with tru cool Heavy Duty 40,000 GVW Max - low pressure drop trans cooler Review: Excellent Cooling Performance – Huge Temperature Drop While Towing - I installed the LPD47391 40K Transmission Oil Cooler on my Hummer H3, and the results have been outstanding. Before the installation, my transmission oil temperature would climb to around 116°C (241°F) when towing for about an hour. After installing this cooler, I completed a 5-hour towing trip, and the transmission temperature never reached 80°C (176°F). That's a massive improvement and exactly what I was hoping for. Installation was straightforward using only the included hardware and brackets. On the H3, I did have to make a few adjustments: Relocated the horn to create enough mounting space. Moved the wiring attached to the center support in front of the radiator. Mounted the cooler with the ports facing upward to help prevent air from becoming trapped inside the unit. One thing I chose not to use was the supplied hose. I couldn't find sufficient information regarding its pressure or temperature ratings, so for peace of mind I purchased 10 feet of hydraulic transmission-rated hose, cut it into two sections, and used that instead. Overall, I'm extremely happy with this cooler. The reduction in transmission temperature has been dramatic, and it has given me much more confidence when towing for extended periods. If you're looking for a heavy-duty transmission cooler and have the space to install it, I'd definitely recommend this one. Pros: Excellent cooling capacity Significant reduction in transmission temperatures Includes mounting hardware and brackets Solid construction Great for towing applications Cons: Included hose specifications are not clearly documented May require minor vehicle-specific modifications for mounting however i did not drill or cut anything, only used holes that were already there and parts that came with the radiator. Bottom line: A worthwhile upgrade that reduced my towing transmission temperatures from 116°C to under 80°C. Very satisfied with the purchase. Review: It cools great - Well packaged. Installed into diesel with allison 1000, It dropped transmission temperature 20° - 25°. Update: replacement ordered, weld broke and failed. 2nd replacement failed. Will not order again. ## Features - 40k Transmission Oil Cooler lpd47391 Compatible with tru cool Heavy Duty 40,000 GVW Max - low pressure drop trans cooler ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0D99MDZ1X | | Assembly Required | No | | Brand | Lucky Seven | | Customer Reviews | 4.0 4.0 out of 5 stars (108) | | Date First Available | 1 August 2024 | | Exterior | Brushed | | Generic Name | 40k Transmission Oil Cooler | | Item Dimensions LxWxH | 10.2 x 7.6 x 7.6 Centimeters | | Item Weight | 113 g | | Item model number | LPD47391 40k | | Manufacturer | 40k Transmission Oil Cooler | | Manufacturer Part Number | LPD47391 40k | | Model | 40k Transmission Oil Cooler | | Product Dimensions | 10.16 x 7.62 x 7.62 cm; 113.4 g | ## Images ![40k Transmission Oil Cooler lpd47391 - Image 1](https://m.media-amazon.com/images/I/81S0F4hZs5L.jpg) ![40k Transmission Oil Cooler lpd47391 - Image 2](https://m.media-amazon.com/images/I/71Jgv-DYCAL.jpg) ![40k Transmission Oil Cooler lpd47391 - Image 3](https://m.media-amazon.com/images/I/61aN2AQfSAL.jpg) ![40k Transmission Oil Cooler lpd47391 - Image 4](https://m.media-amazon.com/images/I/81Vx5iGeasL.jpg) ![40k Transmission Oil Cooler lpd47391 - Image 5](https://m.media-amazon.com/images/I/81QoITPi5bL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Excellent Cooling Performance – Huge Temperature Drop While Towing *by E***Z on 28 July 2026* I installed the LPD47391 40K Transmission Oil Cooler on my Hummer H3, and the results have been outstanding. Before the installation, my transmission oil temperature would climb to around 116°C (241°F) when towing for about an hour. After installing this cooler, I completed a 5-hour towing trip, and the transmission temperature never reached 80°C (176°F). That's a massive improvement and exactly what I was hoping for. Installation was straightforward using only the included hardware and brackets. On the H3, I did have to make a few adjustments: Relocated the horn to create enough mounting space. Moved the wiring attached to the center support in front of the radiator. Mounted the cooler with the ports facing upward to help prevent air from becoming trapped inside the unit. One thing I chose not to use was the supplied hose. I couldn't find sufficient information regarding its pressure or temperature ratings, so for peace of mind I purchased 10 feet of hydraulic transmission-rated hose, cut it into two sections, and used that instead. Overall, I'm extremely happy with this cooler. The reduction in transmission temperature has been dramatic, and it has given me much more confidence when towing for extended periods. If you're looking for a heavy-duty transmission cooler and have the space to install it, I'd definitely recommend this one. Pros: Excellent cooling capacity Significant reduction in transmission temperatures Includes mounting hardware and brackets Solid construction Great for towing applications Cons: Included hose specifications are not clearly documented May require minor vehicle-specific modifications for mounting however i did not drill or cut anything, only used holes that were already there and parts that came with the radiator. Bottom line: A worthwhile upgrade that reduced my towing transmission temperatures from 116°C to under 80°C. Very satisfied with the purchase. ### ⭐⭐⭐⭐⭐ It cools great *by C***G on 26 June 2025* Well packaged. Installed into diesel with allison 1000, It dropped transmission temperature 20° - 25°. Update: replacement ordered, weld broke and failed. 2nd replacement failed. Will not order again. ### ⭐⭐⭐⭐ Overall good just cheap hose *by T***. on 9 June 2026* Almost really good. It comes with enough hardware and fitting that you’ll need. Just don’t use the hose provided. It busted on me only after 2 hours of driving and had me on the side of the interstate. Replaced with some better stuff. Only reason I’m giving it 4 stars. ## Frequently Bought Together - 40k Transmission Oil Cooler LPD47391, Heavy Duty 40,000 GVW Max, Low Pressure Drop, Compatible with Tru-Cool,Includes Mounting Hardware-Ideal for Heavy Vehicles,40,000 GVW transmission cooler (Silver) - EVIL ENERGY 6AN Male to 5/8 x 18 Inverted Flare Thread Fitting Adapter Straight 2Pcs - EVIL ENERGY 6AN Fuel Line Kit, 6AN Nylon Braided Fuel Line Hose Fitting Kit CPE 20FT Black --- ## 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.kr/products/785655047-40k-transmission-oil-cooler-lpd47391](https://www.desertcart.kr/products/785655047-40k-transmission-oil-cooler-lpd47391) --- *Product available on Desertcart South Korea* *Store origin: KR* *Last updated: 2026-08-27*