Yukon Gear 1541H Alloy 5 Lug Right Hand Rear Axle For 83-86 Ford 8.8in Truck

If the passenger-side rear wheel on an early 8.8-inch Ford truck is humming, weeping gear oil onto the brake shoes, or the shaft has snapped at the spline, you are shopping for a right-hand rear axle shaft. Yukon Gear and Axle YA F880002 is a 1541H alloy replacement for the right side of the Ford 8.8 inch rear axle used in 1983 through 1986 Ford trucks. Yukon specifies it as 31 spline, 5 lug, 31-1/16 inches long, with a 2.87 inch brake pilot. These were the first model years Ford put the 8.8 under its trucks, so original shafts on these rigs are now forty years old and often worn past saving.

What the rear axle shaft does in a Ford 8.8

The 8.8 is a semi-floating, C-clip rear. The splined inner end of the shaft locks into the differential side gear, and a C-clip in a groove on that end, held in place by the pinion cross shaft, keeps the shaft from walking out of the housing. At the outer end the wheel bearing rollers run straight on a ground journal on the shaft itself, so the shaft is both the drive member and the inner bearing race, and it carries the weight of that corner of the truck. On a truck that tows or hauls, that journal and the spline take a beating. Yukon builds this shaft from 1541H alloy steel, which it describes as stronger than stock, and that matters if the truck now has a locker, a bigger engine or larger tires.

Symptoms of a worn or damaged right rear shaft

• A growl or whine from the passenger rear that rises with road speed and gets louder as weight shifts onto that side in a left-hand turn.
• Gear oil on the inside of the right rear tire or soaking the brake shoes, because a seal cannot hold against a grooved or pitted journal.
• A clunk, or a truck that will not move in gear while one rear wheel spins freely, which points to a broken shaft or stripped splines.
• Wheel wobble or brake drum runout after a hard hit, from a bent flange.
• Repeated bearing failures on the same side, a sign the bearing track on the shaft is worn.

How to confirm it before you buy

Jack up the rear, spin the right wheel by hand and listen for roughness, then pull the cover, remove the cross shaft lock bolt and cross shaft, push the shaft in and take out the C-clip. Slide the shaft out and inspect the bearing journal: a visible track, pitting or flaking means the shaft needs replacing, not just a bearing. Count the splines and measure the overall length. The Ford 8.8 was built with both 28 and 31 spline shafts, so do not assume; this part is 31 spline and 31-1/16 inches. If your old shaft is different, stop and send us your year, model and VIN.

Fitment

Yukon lists YA F880002 for the Ford 8.8 inch rear axle in 1983 to 1986 Ford trucks, right-hand (passenger) side only. It is a 5 lug flange with a 2.87 inch brake pilot, and Yukon does not list an ABS tone ring for this shaft. Because these trucks have had decades for axles to be swapped, confirm the axle tag reads 8.8, then match spline count, length and lug pattern to the shaft you remove. The left side is a separate part. For other axle, gear and differential parts, browse our hard parts catalog.

Install notes

• Fit a new wheel bearing and seal with the new shaft every time. The Yukon 8.8 install kit with axle bearings and seals covers them along with a ratio change, but confirm the 2.25 inch bearing OD matches your housing first.
• Seat the C-clip fully in its groove before reinstalling the cross shaft, and use a new or thread-locked cross shaft lock bolt.
• With the cover off, check the carrier and pinion bearings. A tired original rear is worth a Ford 8.8 master bearing kit with Timken bearings, and the Yukon carrier installation kit for the Ford 8.8 covers the carrier side alone.
• Refill with the gear oil grade on your axle tag or in the owner manual, and add friction modifier if the truck has a Traction-Lok limited slip.

Which side does YA F880002 fit?

It is a right-hand rear shaft, the passenger side. The driver side is a separate part, so order each side by its own number.

My 1985 F-150 has an 8.8 rear. How do I know if I need 31 spline?

Count the splines on the shaft you remove. The Ford 8.8 was made with both 28 and 31 spline shafts, and this part is 31 spline only. Also check that your old shaft measures 31-1/16 inches overall.

Do I need a new wheel bearing with this axle shaft?

Yes. The bearing rollers ride directly on the shaft journal, so a new bearing and seal should go in with the new shaft. Reusing an old bearing shortens the life of the new journal.

Does this shaft have an ABS tone ring?

Yukon does not list a tone ring for this 1983-1986 truck shaft. If your truck has a sensor that reads off the axle, compare it with your original before installing and send us the VIN if unsure.

What gear oil goes back in the 8.8?

Use the grade on your axle tag or in the owner manual, and add friction modifier if the rear has a Traction-Lok limited slip. Check the fill level at the fill plug once the cover is back on.