Yukon 05-20 Ford F-250/F-350 Super Duty 10.5in Rear Differential Chromoly Axle Shaft (Rear Left)
If the left rear shaft in your Super Duty's Sterling 10.5 has twisted its splines, snapped behind the flange, or you are building a diesel that tows heavy on big tires, this is the part you are after. Yukon's YA WF10.5-35-36.93 is a 4340 chromoly replacement for the rear left (driver side) shaft in the Ford 10.5 inch rear axle, listed for 2005-2020 F-250 and F-350 pickups. It has 35 inner splines, measures 36.93 inches end to end and has an O-ring groove at the hub end.
The Sterling 10.5 is a full-floating axle. The truck's weight rides on two tapered wheel bearings on the axle tube spindle, and the shaft does only one job: carry torque from the side gear in the differential out to the hub. The flange bolts to the hub, and the 35-spline inner end slides into the side gear. Because the shaft carries no vehicle weight, a broken one does not drop the wheel off the truck the way a C-clip axle can, but the truck is dead in the water until it is replaced. Stock Sterling shafts are about 1.50 inches thick, and Yukon builds this one from 4340 chromoly with cold roll-formed splines and induction heat treatment, which is what gives it more twist resistance than a plain carbon-steel shaft. Our guide to chromoly vs stock axle shafts explains when the upgrade is worth it.
Pull the shaft: remove the flange bolts at the hub and slide it out. Lay it on a flat bench and roll it to check for bend, and look hard at the inner splines and the radius behind the flange. If the shaft broke, pull the cover and inspect the side gear and spider gears for chips, because a broken shaft usually means a hard shock load went through the whole carrier. Our Sterling 10.5 problems and rebuild cost guide covers the pinion bearing and hub seal failures that often get blamed on shafts, and the full-float vs semi-float guide shows how to tell which design you have.
This listing is the rear left shaft for the Ford 10.5 inch rear with 35-spline shafts, 2005-2020 F-250 and F-350. Yukon notes it can be cut down for 34 to 36.9 inch applications, which tells you shaft length varies across these trucks. Before ordering, measure your old left shaft from the flange face to the end of the splines and compare it to 36.93 inches. Some 2017-and-later F-250s left the factory with a Dana rear instead of a Sterling, so read the axle tag or the axle code on the door sticker. If you are unsure, send us your year and VIN. Need both sides or a Sterling for a different year? Browse hard parts, or plan a full refresh with the Yukon 2011-up Ford 10.5 master overhaul kit.
| Brand | Yukon Gear & Axle |
| Part number | YA WF10.5-35-36.93 |
| Fits | Yukon 05-20 Ford F-250/F-350 Super Duty 10.5in Rear Differential Chromoly Axle Shaft (Rear Left) |
| Vehicle fitment | Ford F-250/F-350 (2005-2020) |
| Type | Axles |
| 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.
It is the rear left (driver side) shaft for the Ford 10.5 inch rear, 35 spline, 36.93 inches long. The right side is a different length on most of these trucks, so measure both sides before ordering a pair.
Only if your truck has the Sterling 10.5 rear. Some 2017-and-later F-250s were built with a Dana rear axle. Check the axle tag or door sticker axle code, or send us your VIN to confirm.
No. The Sterling 10.5 is full floating, so the shaft comes out after you remove the flange bolts at the hub. You only open the cover if the shaft broke and you need to check the side gears and spiders for damage.
75W-90 or 75W-140 gear oil to the bottom of the fill hole. Add friction modifier if the axle has a clutch-type limited slip.
Yukon builds this shaft from 4340 chromoly with rolled splines and induction heat treatment, which resists twisting better than a stock carbon-steel shaft. It is the shaft to pick for diesel torque, towing, larger tires or a locker.
