{"id":4023,"date":"2025-07-09T14:30:31","date_gmt":"2025-07-09T14:30:31","guid":{"rendered":"https:\/\/generaltruckparts.com\/?post_type=product&#038;p=3972"},"modified":"2025-11-11T17:21:06","modified_gmt":"2025-11-11T17:21:06","slug":"dana-d170-391","status":"publish","type":"product","link":"https:\/\/generaltruckparts.com\/shop\/differential-axle\/differential-assemblies\/dana-d170-391\/","title":{"rendered":"Dana\/Spicer D170-391 Differential"},"content":{"rendered":"<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p><strong>Dana Spicer D170-391<\/strong><br \/>\n<strong>D170391GTP<\/strong><\/p>\n<p>The <strong>Dana Spicer D170 Series <\/strong>is a heavy-duty <strong>tandem drive axle differential<\/strong> designed to meet the demands of high-torque, high-load applications. Engineered for maximum durability, the D170 offers a rugged design, advanced gearing technology, and a wide selection of gear ratios for performance tuning across various vocational and on-highway applications.<\/p>\n<p>Built to handle extreme duty cycles, the D170 differential is well-suited for refuse trucks, construction vehicles, and long-haul transport. It features <strong>dual-reduction gearing<\/strong> with a <strong>spiral bevel input and helical inter-axle gearing<\/strong>, which improves power flow and minimizes wear. The D170 is also known for its <strong>high torque capacity<\/strong>, <strong>enhanced thermal management<\/strong>, and <strong>long maintenance intervals<\/strong>, making it a cost-effective solution for fleet operators.<\/p>\n<h5><strong>Technical Specifications<\/strong><\/h5>\n<h6><strong>General Features:<\/strong><\/h6>\n<ul>\n<li>Tandem drive axle differential designed for <strong>severe-duty and high-GVWR applications<\/strong><\/li>\n<li>Heavy-duty, dual-reduction gear system for maximum torque transfer<\/li>\n<li>Designed for on-highway, off-highway, and vocational truck markets<\/li>\n<\/ul>\n<h6><strong>Axle Rating &#038; Load Capacity:<\/strong><\/h6>\n<ul>\n<li>Gross Axle Weight Rating (GAWR): <strong>46,000 lbs (20,865 kg)<\/strong><\/li>\n<li>Maximum GCW (Gross Combined Weight): <strong>up to 160,000 lbs (72,575 kg)<\/strong><\/li>\n<\/ul>\n<h6><strong>Gear Design and Ratios:<\/strong><\/h6>\n<ul>\n<li>Gear Type: <strong>Dual-reduction<\/strong> with <strong>spiral bevel input<\/strong> and <strong>helical inter-axle gearing<\/strong><\/li>\n<li>Ring Gear Diameter: <strong>17 inches (432 mm)<\/strong><\/li>\n<li>Input Shaft Spline Count: <strong>39-spline (standard)<\/strong><\/li>\n<li>Available Gear Ratios:\n<ul>\n<li><strong>3.07, 3.31, 3.55, 3.70, 3.91, 4.10, 4.33, 4.56, 4.78, 5.13, 5.29, 5.38, 5.57, 5.86<\/strong><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h6><strong>Construction and Materials:<\/strong><\/h6>\n<ul>\n<li>Carrier Housing: <strong>Cast ductile iron<\/strong> for strength and resistance to thermal and mechanical stress<\/li>\n<li>Heat-treated alloy steel gears for extended wear life<\/li>\n<li>High-strength axle shafts and differential case<\/li>\n<\/ul>\n<h6><strong>Lubrication and Cooling:<\/strong><\/h6>\n<ul>\n<li>Pressurized lubrication system with <strong>internal channels<\/strong> for improved oil flow<\/li>\n<li>Optional <strong>lube pump<\/strong> for severe service applications<\/li>\n<li>Oil Capacity: <strong>Approx. 20\u201322 quarts per axle<\/strong> (varies by configuration)<\/li>\n<\/ul>\n<h6><strong>Differential Lock and Traction:<\/strong><\/h6>\n<ul>\n<li>Inter-axle differential lock (power divider lock) standard on most models<\/li>\n<li>Optional driver-controlled <strong>lockers<\/strong> for additional traction in off-road or poor-traction conditions<\/li>\n<li>Enhanced traction options for logging, oilfield, and off-road conditions<\/li>\n<\/ul>\n<h6><strong>Suspension &#038; Brake Compatibility:<\/strong><\/h6>\n<ul>\n<li>Compatible with a wide range of suspensions: <strong>air, mechanical, and walking beam<\/strong><\/li>\n<li>ABS sensor-ready hub configurations available<\/li>\n<li>Multiple track widths and axle housing configurations for OEM flexibility<\/li>\n<\/ul>\n<h6><strong>Serviceability and Maintenance:<\/strong><\/h6>\n<ul>\n<li>Modular carrier design for simplified removal and service<\/li>\n<li>Extended lubrication change intervals (depending on oil type and duty cycle)<\/li>\n<li>Standardized internal parts with other Dana heavy-duty axles for easier sourcing<\/li>\n<\/ul>\n<h5>Applications:<\/h5>\n<ul>\n<li>Refuse and sanitation trucks<\/li>\n<li>Dump and construction vehicles<\/li>\n<li>Logging and forestry trucks<\/li>\n<li>Oilfield and mining support vehicles<\/li>\n<li>Heavy-haul and specialty vocational trucks<\/li>\n<li>On-highway trucks requiring high GCW capacity<\/li>\n<\/ul>\n<h5>Key Benefits:<\/h5>\n<ul>\n<li>High-capacity axle designed for <strong>maximum torque and heavy payloads<\/strong><\/li>\n<li><strong>Dual-reduction gear design<\/strong> provides strength and smooth torque transfer<\/li>\n<li>Broad gear ratio range allows for tuning performance and fuel efficiency<\/li>\n<li>Designed for <strong>longevity and reduced downtime<\/strong> in severe-duty applications<\/li>\n<li>Supported by Dana&#8217;s global service network and parts availability<\/li>\n<\/ul>\n<p>\u00a0<\/p>\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-a89b3969 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-primary-background-color has-background wp-element-button\" href=\"https:\/\/generaltruckparts.com\/wp-content\/uploads\/2025\/05\/Dana-Differentials-Manual.pdf\">DOWNLOAD D170 MANUAL<\/a><\/div>\n<\/div>\n<p>\u00a0<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p class=\"ai-optimize-28\">The <strong>Dana Spicer D170-391<\/strong> is a heavy-duty <strong>tandem drive axle differential<\/strong> designed to meet the demands of high-torque, high-load applications.<br \/>\n<strong>D170391GTP<\/strong><\/p>\n","protected":false},"featured_media":11539,"template":"","meta":{"_acf_changed":false},"product_brand":[235],"product_cat":[148,170],"product_tag":[2939,2918],"class_list":{"0":"post-4023","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_brand-dana-spicer","7":"product_cat-differential-axle","8":"product_cat-differential-assemblies","9":"product_tag-d170","10":"product_tag-tandem-drive-axle-differential","11":"product_shipping_class-heavy-packages","12":"pa_product-category-differential-axle","13":"pa_subcategory-differential-assemblies","15":"first","16":"instock","17":"featured","18":"taxable","19":"shipping-taxable","20":"purchasable","21":"product-type-simple"},"exclude_global_add_ons":false,"addons":[{"name":"Core Price $1500.00","type":"heading","position":0,"required":false,"title_format":"label","default":"","description_enable":false,"description":"","placeholder_enable":false,"placeholder":"","display":"select","restrictions_type":"any_text","adjust_price":false,"price":"","price_type":"flat_fee","restrictions":false,"min":"0","max":"0","options":[],"id":1762379421},{"name":"Condition","type":"checkbox","position":0,"required":true,"title_format":"label","default":"","description_enable":false,"description":"","placeholder_enable":false,"placeholder":"","display":"select","restrictions_type":"any_text","adjust_price":false,"price":"","price_type":"flat_fee","restrictions":false,"min":"0","max":"0","options":[{"label":"Remanufactured","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"New","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"Quote for both Reman and New","price":"","price_type":"flat_fee","image":0,"visibility":true}],"id":1751388286},{"name":"Carrier Assembly","type":"multiple_choice","position":1,"required":false,"title_format":"label","default":"","description_enable":false,"description":"","placeholder_enable":false,"placeholder":"","display":"select","restrictions_type":"any_text","adjust_price":false,"price":"","price_type":"flat_fee","restrictions":false,"min":"0","max":"0","options":[{"label":"Front: Open \/ 1 air line","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"Front: Locking \/ 2 air lines","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"Rear: Open \/ no air lines","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"Rear: Locking \/ 1 air line","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"Other","price":"","price_type":"flat_fee","image":0,"visibility":true}],"id":1749223020},{"name":"Gear\/Axle Ratio","type":"multiple_choice","position":2,"required":false,"title_format":"label","default":"","description_enable":false,"description":"","placeholder_enable":false,"placeholder":"","display":"select","restrictions_type":"any_text","adjust_price":false,"price":"","price_type":"flat_fee","restrictions":false,"min":"0","max":"0","options":[{"label":"2.26","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"2.28","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"2.39","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"2.47","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"2.53","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"2.64","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"2.79","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"3.08","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"3.21","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"3.42","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"3.55","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"3.70","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"3.90","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"4.10","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"4.30","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"4.56","price":"","price_type":"flat_fee","image":0,"visibility":true},{"label":"Other","price":"","price_type":"flat_fee","image":0,"visibility":true}],"id":1749223221},{"name":"Other notes or requests","type":"custom_textarea","position":3,"required":false,"title_format":"label","default":"","description_enable":false,"description":"","placeholder_enable":false,"placeholder":"","display":"select","restrictions_type":"any_text","adjust_price":false,"price":"","price_type":"flat_fee","restrictions":false,"min":"0","max":"0","options":[],"id":1749443746}],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.5 (Yoast SEO v26.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Dana\/Spicer D170-391 Differential - General Truck Parts and Equipment<\/title>\n<meta name=\"description\" content=\"The Dana Spicer D170-391 is a heavy-duty tandem drive axle differential designed to meet the demands of high-torque, high-load applications. 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