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1999-03 7.3L Ford Powerstroke Axles and Differentials

The 1999-2003 Powerstroke equipped F-250 and F-350 trucks featured a Dana 60 assembly up front and either a Dana 80 or 10.5" out back. The 10.5's were reserved for single rear wheel (SRW) applications ... read more

Dynatrac Pro Series Dana 80 Differential Cover DYN-DA80-1X4033-A 8.00 Dynatrac Pro Series Dana 80 Differential Cover Dynatrac DA80-1X4033-A Dynatrac Pro Series Differential Covers offer top-notch protection for your axle’s differential. Dynatrac Dynaloc Locking Hubs 99-04 Ford SuperDuty DYN-FO60-3B396-BA 30.00 Dynatrac Dynaloc Locking Hubs 99-04 Ford SuperDuty Dynatrac FO60-3B396-BA Leave it to Dynatrac to re-design and improve on a 20 year old design that is essential to reliable four-wheeling for your SuperDuty. Yukon Gear & Axle Dana Spicer 80 Ring and Pinion YUK-YG_D80-331-Main 0.00 Yukon Gear & Axle Dana Spicer 80 Ring and Pinion Yukon Gear & Axle YG D80-331 Looking to upgrade your Dana 80's ring and pinon to keep your truck performing with bigger tires? Grab this Yukon Ring and Pinon and be amazed with the quality and durability! Yukon Gear & Axle Ford 10.25" Ring and Pinion YUK-YG_F1025-355L-Main 0.00 Yukon Gear & Axle Ford 10.25" Ring and Pinion Yukon Gear & Axle YG F10.25-355L Looking to upgrade your Ford 10.25" ring and pinon to keep your truck performing with bigger tires? Grab this Yukon Ring and Pinon and be amazed with the quality and durability! Yukon Master Overhaul Kit Dana Spicer 60 Front Dana Spicer 60 Front YUK-YK_D60-F 9.85 Yukon Master Overhaul Kit Dana Spicer 60 Front Dana Spicer 60 Front Yukon Gear & Axle YK D60-F Power Products carries the Yukon Master Overhaul Kit Dana Spicer 60 Front Yukon Master Overhaul Kit Dana Spicer 80 99-10 Ford SuperDuty Dana Spicer 80 YUK-YK_D80-B 13.68 Yukon Master Overhaul Kit Dana Spicer 80 99-10 Ford SuperDuty Dana Spicer 80 Yukon Gear & Axle YK D80-B Power Products carries the Yukon Master Overhaul Kit Dana Spicer 80 1998 Newer Ford Yukon Master Overhaul Kit Ford 85-05 Ford 10.25" Ford 10.25" YUK-YK_F1025 13.25 Yukon Master Overhaul Kit Ford 85-05 Ford 10.25" Ford 10.25" Yukon Gear & Axle YK F10.25 Power Products carries the Yukon Master Overhaul Kit Ford 10.25" Yukon Master Overhaul Kit 1999-2007 Ford 10.5" Ford 10.5" YUK-YK_F105-A 12.78 Yukon Master Overhaul Kit 1999-2007 Ford 10.5" Ford 10.5" Yukon Gear & Axle YK F10.5-A Power Products carries the Yukon Master Overhaul Kit Ford 10.5" Yukon Gear Dana 80 35 Spline Axle Shaft , 40.24" Long , 8 X 4.02" Bolt Pattern Dana 80 35 Spline AXL YUK-YA_D47847-2 19.42 Yukon Gear Dana 80 35 Spline Axle Shaft , 40.24" Long , 8 X 4.02" Bolt Pattern Dana 80 35 Spline AXL Yukon Gear & Axle YA D47847-2 Power Products carries the Yukon Gear Dana 80 35 Spline AXLE SHAFT , 40.24" LONG , 8 X 4.02" Bolt Pattern Yukon 1541H Alloy Rear Axle for Dana 60, 70, and 80 YUK-YA_FF35-Main 0.00 Yukon 1541H Alloy Rear Axle for Dana 60, 70, and 80 Yukon Gear & Axle YA FF35-33.5 Power Products carries the Yukon 1541H alloy rear axle for Dana 60, 70, and 80 Dynatrac Free Spin Heavy-Duty Hub Conversion 1999-14 Ford Super Duty F-250/350 FO60-3X1104 DYN-FO60-3X1104-B-main 0.00 Dynatrac Free Spin Heavy-Duty Hub Conversion 1999-14 Ford Super Duty F-250/350 FO60-3X1104 Dynatrac FO60-3X1104-A With Dynatrac’s Free-Spin kit you can easily change out the problematic unit bearings for durable, reliable, inexpensive and easy to maintain fixed spindle wheel bearings. Yukon Grizzly Locker Ford 10.25" and 10.5" with 35 Splines YUK-YGLF1025-35 36.32 Yukon Grizzly Locker Ford 10.25" and 10.5" with 35 Splines Yukon Gear & Axle YGLF10.25-35 Yukon Grizzly Locker Ford 10.25" and 10.5" with 35 Splines

The 1999-2003 Powerstroke equipped F-250 and F-350 trucks featured a Dana 60 assembly up front and either a Dana 80 or 10.5" out back. The 10.5's were reserved for single rear wheel (SRW) applications, where the larger 80 was used in all duallies (DRW). From the factory, these housings were stuffed with either the popular 3.73 ratio, or the 4.10 most commonly used for heavy duty towing, as it delivers higher RPM's at lower speeds in comparison to the 3.73 ratio.

Over the years, these assemblies have proven themselves relatively reliable on moderately used trucks running stock, or close to stock tire size and power output. For those of us that demand substantial power increases and larger tires, there is room for improvement to improve the reliability and performance that they can afford. One of the best upgrades we can recommend for anyone that has increased tire size, is that of a ring and pinion ratio upgrade. As previously stated, most of these trucks came factory with a 3.73 ratio, designed to have a proper run out with a stock size tire (roughly 31" depending on model year). But as soon as you upgrade to a 35" or larger tire, all of a sudden your RPM vs. speed are effected, even causing a disruption of the shift pattern on automatic transmission equipped trucks.

Lets give the example of upgrading to a 37" tire. By using cross multiplication, we can determine that in order to have the same RPM vs. speed as with the factory tire size, you would want to install a 4.45 gear ratio (3.73/31*37). Unfortunately, in this scenario there is no such thing as a 4.45 ratio, but the closest would be a 4.56 that is readily available. Or, you can also opt to go with a slightly higher ratio of 4.10 that would give you a lower RPM vs. speed compared to stock.

Besides replacing the ring and pinion, we also offer numerous other upgrades, such as ARB Air Lockers, rebuild kits, and so much more. As always, if you have any questions about which product is right for you and your truck don't hesitate to give us a call or send us an e-mail to [email protected] and we would be happy to help.

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