Yukon Gear Chrome Replacement Cover For Dana 80

The Dana 80 lives under the heaviest one-ton pickups and vans of the 1990s and 2000s: Ford F-350 and F-450 Super Duty, E-350 and E-450 vans, 1994-2002 Dodge Ram 2500 and 3500 Cummins trucks, and GM C/K3500 duallys and Express 3500 vans. When the stamped rear cover on one of those trucks rots out, gets crushed by a hitch or keeps seeping oil, the Yukon YP C1-D80 is a stock-shape replacement finished in chrome. It bolts to the housing with your original hardware and puts a bright, easy-to-clean surface where you can spot a fresh leak at a glance.

What the cover does on a Dana 80

The Dana 80 is a full-floating rear axle with an 11.25 inch ring gear, and you can pick it out by its straight tubes, the 80 cast into the housing and its 10-bolt asymmetrical cover. That cover is what this part replaces. It seals the back of the carrier and forms the sump for the gear oil that the big ring gear throws onto the pinion bearings and carrier bearings. Because these axles spend their lives towing fifth-wheels and hauling at or near their rating, they make a lot of heat, and the oil level matters. A slow cover leak that drops the level an inch or two is how many Dana 80s end up with worn carrier and pinion bearings and a chewed ring gear.

Signs it is time for a new cover

• Gear oil seeping from the cover seam, usually lowest at the bottom bolts
• Heavy rust or scale on the cover from road salt and standing water
• A dent from a trailer hitch, ball mount or off-road strike that pushes the cover toward the ring gear
• Bolt holes that are elongated or stripped from past fluid services
• Rising axle temperature or new gear noise after the truck was run low on oil

How to confirm before you buy

Degrease the housing and drive the truck, then look at where the wet starts. A wet cover seam means the cover or its seal; oil on the yoke or at the hub means a pinion seal or a hub seal, which this part will not fix. Our diff cover leak guide covers gasket versus RTV and how to tell the leaks apart. If you already hear whine or clunk, read Dana 80 rear axle problems and rebuild cost first, since bearing wear should be dealt with while the cover is off anyway.

Fitment

Yukon lists this cover for the Dana 80 in 1988-1997 Ford F-350 and F-Super Duty, 1999-2015 F-350 Super Duty, 1999-2005 F-450 Super Duty, 1988-2010 E-350 vans and 2000-2005 E-450; 1994-2002 Dodge Ram 2500 and 3500, 1995-1998 B3500 and 1999-2003 Ram 2500 vans; and GM 1990-2000 C/K3500, 1991-2002 C3500HD, 1996-2007 Express 3500, 1992-1995 G30, 1997-1999 P30 and 2003-2009 C4500 Kodiak. It fits both 35-spline and 37-spline axles, because the cover pattern does not change with the shaft spline.

Not every truck on that list left the factory with a Dana 80. Ford, Dodge and GM all used other rear axles in the same model years depending on engine, gross weight and single or dual rear wheels. Confirm the 80 cast into the housing and the 10-bolt asymmetrical cover before ordering, or send us the year and VIN. Other parts for this axle are listed under hard parts.

Install notes

• Break the cover loose at the bottom and let the oil drain into a wide pan. Look at the magnet and the drained oil: fine gray paste is normal, chunks or bronze glitter mean bearings or gears are failing.
• Scrape every trace of old gasket or RTV off the housing flange and clean it dry. A clean flange matters more than the sealer you pick.
• Seal with a new Dana 80 cover gasket or a thin, continuous bead of gear-oil-rated RTV inside the bolt circle. Snug the bolts in a cross pattern so the stamped flange is not bent.
• Fill with 75W-90 or 75W-140 gear oil to the bottom of the fill hole. A Ford Super Duty with the factory Trac-Lok limited slip also needs limited-slip friction modifier; Wikipedia notes Dana replaced the Power-Lok with the Trac-Lok in 1998.
• If the oil showed wear, plan a bearing job. The Dana 80 carrier bearing kit covers the side bearings. Full overhaul kits are split by pinion bearing size: the 4.375 inch OD kit for 1998-up Fords and the 4.125 inch OD kit for the others.

This is a factory-pattern cover with a chrome finish, so it restores a clean, sealed axle rather than adding armor. For trucks that see rocks, deep ruts or heavy hitch contact, Yukon's nodular iron Hardcore Dana 80 cover is the tougher option. At a 5.1 lb shipping weight, this one is a simple swap you can do in the driveway in under an hour.

How do I know my truck has a Dana 80 and not another axle?

Look for 80 cast into the housing, straight axle tubes and a 10-bolt cover with an asymmetrical shape. Many trucks on the fitment list were also built with other rear axles, so check the housing or send us your year and VIN.

Does it matter if my Dana 80 has 35 or 37 spline axles?

No. Yukon lists this cover for both 35-spline and 37-spline Dana 80 axles. The spline count changes the shafts and carrier, not the cover.

Is a gasket included?

The listing is for the cover itself. Use a new Dana 80 cover gasket or gear-oil-rated RTV, and reuse your original cover bolts if the threads are good.

What oil goes back in a Dana 80?

Use 75W-90 or 75W-140 gear oil filled to the bottom of the fill hole. If the axle has a clutch-type limited slip, such as the Trac-Lok used in Ford Super Duty trucks from 1998, add limited-slip friction modifier.

Should I replace anything else while the cover is off?

Inspect the oil and magnet. Metal chunks or a whine on the road mean carrier or pinion bearings, and that is the time to do a carrier bearing kit or master overhaul kit, not after the ring gear is damaged.