Axles - Differentials | 1999-2003 Ford 7.3 Powerstroke

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

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Yukon Gear & Axle Dana Spicer 80 Ring and Pinion YUK-YG_D80-331-Main 0.00

Yukon Gear & Axle YG D80-331

Yukon Gear & Axle Dana Spicer 80 Ring and Pinion $ 377.51 2050-01-01

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 YG F10.25-355L

Yukon Gear & Axle Ford 10.25" Ring and Pinion $ 330.31 2050-01-01

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 YUK-YK_D60-F 9.85

Yukon Gear & Axle YK D60-F

Yukon Master Overhaul Kit Dana Spicer 60 Front $ 359.11 2050-01-01

Power Products carries the Yukon Master Overhaul Kit Dana Spicer 60 Front Yukon Master Overhaul Kit Dana Spicer 80 99-16 Ford SuperDuty Dana Spicer 80 YUK-YK_D80-B 13.68

Yukon Gear & Axle YK D80-B

Yukon Master Overhaul Kit Dana Spicer 80 99-16 Ford SuperDuty Dana Spicer 80 $ 617.51 2050-01-01

Diesel Power Products carries the Yukon Master Overhaul Kit Dana Spicer 80for 1999-2016 Ford Yukon Master Overhaul Kit Ford 85-99 10.25" YUK-YK_F1025 13.25

Yukon Gear & Axle YK F10.25

Yukon Master Overhaul Kit Ford 85-99 10.25" $ 435.11 2050-01-01

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 Gear & Axle YK F10.5-A

Yukon Master Overhaul Kit 1999-2007 Ford 10.5" Ford 10.5" $ 504.71 2050-01-01

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 & Axle YA D47847-2

Yukon Gear Dana 80 35 Spline Axle Shaft , 40.24" Long , 8 X 4.02" Bolt Pattern Dana 80 35 Spline AXL $ 343.11 2050-01-01

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 Gear & Axle YA FF35-33.5

Yukon 1541H Alloy Rear Axle for Dana 60, 70, and 80 $ 221.51 2050-01-01

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 FO60-3X1104-A

Dynatrac Free Spin Heavy-Duty Hub Conversion 1999-14 Ford Super Duty F-250/350 FO60-3X1104 $ 1684.53 2050-01-01

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 Gear & Axle YGLF10.25-35

Yukon Grizzly Locker Ford 10.25" and 10.5" with 35 Splines $ 919.11 2050-01-01

Yukon Grizzly Locker Ford 10.25" and 10.5" with 35 Splines Spyntec Hub Conversion Kit 99-08 Ford F-250 / F-350 SuperDuty SAST-F9904C-Main 0.00

SpynTec Industries SAST-F9904C

Spyntec Hub Conversion Kit 99-08 Ford F-250 / F-350 SuperDuty $ 1700 2050-01-01

Better fuel economy, less wear and tear, strength....that's all what you can expect from installing a Spyntec Hub Conversion Kit on your Ford SuperDuty! AFE Power 10.5" Rear Differential Cover 94-23 Ford F-250 / F-350 AFE-46-70022 15.00

AFE 46-70022

AFE Power 10.5" Rear Differential Cover 94-23 Ford F-250 / F-350 $ 355 2050-01-01

Keep your rear differential cool and looking good with an AFE differential cover for your SuperDuty

Description

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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