Yukon Gear High Performance Gear Set For Dana 80 in a 3.73 Ratio
The Dana 80 is the rear axle under dually Ford F-350 and F-450 Super Duty trucks, 1994-2002 Ram 2500 and 3500 diesels, GM C3500HD and Kodiak chassis and one-ton E-series and Express vans. A 3.73 ratio is a common towing gear for these trucks, and the Yukon Gear & Axle YG D80-373 is a new 3.73 ring and pinion for an axle that has started to howl, chipped a tooth under load, or needs to change from a taller highway ratio.
Yukon lists this set with an 11.25 in. ring gear, a 37 spline pinion and 12 ring gear bolts. The Dana 80 is full floating: the hubs carry the truck's weight and the axle shafts only transmit torque, so the ring and pinion and their bearings take the full output of a diesel pulling a gooseneck or a camper. At 3.73 the driveshaft turns 3.73 times per wheel turn, a middle ground between the 3.54 and 4.10 ratios these trucks also used.
Yukon's fitment notes say this set fits a 3-series, 3.73-and-down carrier. Its technical note also warns that 1998-and-newer Ford F-350 dually trucks left the factory with a thin 3.73 gear on a 4-series carrier. On those trucks, check the carrier you have before ordering, because a set built for the 3-series carrier will not install on a 4-series case without changing the carrier. Our carrier break explainer covers why the case changes with ratio. If you are adding traction during the job, the Dura Grip for 35 spline, 3.73-and-down Dana 80s matches this carrier range.
Bearing growl and gear whine overlap on this axle, and replacing gears without bearings rarely ends the noise. Our Dana 80 rear axle problems guide explains how to separate them. Check the axle tag for the current ratio, pull the cover to inspect the tooth contact, and check for pinion play at the yoke.
Yukon's fitment table for YG D80-373 lists 1988-1997 Ford F-350, 1999-2015 F-350 Super Duty, 1999-2005 F-450 Super Duty, 1988-2010 E-350 and 2000-2005 E-450 vans, 1994-2002 Dodge Ram 2500 and 3500, 1990-2002 GM C/K3500 and C3500HD, 2003-2009 C4500 Kodiak and 1996-2007 Express 3500. Ford Dana 80s use either a 4.125 in. or a 4.375 in. pinion bearing race, which changes the bearing kit but not this gear set. Send your year, VIN and axle tag if you are unsure. Other ratios for the same axle include the Dana 80 3.55 set and the Dana 80 5.38 set.
Pair the gears with a master kit: the 4.125 in. race kit (ZK D80-A) or the 4.375 in. race kit for Ford (YK D80-B). The Dana 80 sets pinion preload with shims rather than a crush sleeve. Yukon's setup chart lists a 0.060 in. starting pinion shim, 25-40 in-lb pinion bearing preload with new bearings (10-16 in-lb used), 0.006-0.011 in. backlash, 175 ft-lb ring gear bolts and 90 ft-lb cap bolts. Use a housing spreader to set the carrier, fill with 75W-90 or 75W-140 gear oil (with friction modifier for a limited slip), and follow the ring and pinion break-in procedure before you tow.
| Brand | Yukon Gear & Axle |
| Part number | YG D80-373 |
| Fits | Yukon Gear High Performance Gear Set For Dana 80 in a 3.73 Ratio |
| Type | Final Drive Gears |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The Dana 80 in that truck is listed, but Yukon notes that 1998-and-newer F-350 duallys came with a thin 3.73 gear on a 4-series carrier, while this set fits the 3-series 3.73-and-down carrier. Send us your VIN and axle tag so we can confirm the carrier before you order.
No. The Dana 80 sets pinion bearing preload with shims. The master overhaul kit for your axle supplies them.
It depends on the pinion bearing race. Most Dana 80s use a 4.125 in. race, and many 1999-up Fords use a 4.375 in. race. Measure the old race or read its part number before you order the kit.
If your carrier is the 3.73-and-down type it will. Change the clutch packs while it is apart and add friction modifier unless your gear oil already has it.
Use 75W-90 or 75W-140 gear oil and fill to the bottom of the fill hole. Change it after the first few hundred miles, because new gears put metal into the oil while they seat.
