Yukon Gear Master Overhaul Kit For 2011+ Chrysler 9.25in ZF Rear
A Ram 1500 that whines from the rear on the highway, howls on deceleration, or leaks gear oil at the pinion seal has worn bearings in the rear differential, and on 2011-and-later trucks that differential is usually the ZF-built 9.25 in. rear. The Yukon Gear & Axle YK C9.25ZF is the master overhaul kit for that axle. It carries the Timken carrier bearings and races, the Timken pinion bearings and races, a pinion seal, a complete shim kit, ring gear bolts, a pinion nut, a crush sleeve, thread locker, marking compound with a brush, and a gasket, so the center section can be rebuilt or re-geared from one box.
The ZF 9.25 is a semi-floating rear with a 235 mm ring gear, built by ZF rather than the older Chrysler and American Axle 9.25 designs. The pinion rides on two tapered bearings held in preload by a crush sleeve, and the carrier rides on two more tapered bearings positioned by shims, which also set how the ring gear meshes with the pinion. When those bearings wear, the gear mesh moves and the axle starts to whine at a steady cruise or on coast. The pinion seal is the other common failure, usually from a worn bearing letting the pinion move or from a nicked flange. Replacing every bearing, race, seal and the crush sleeve together resets the center section instead of mixing new parts with worn ones. Our Chrysler 9.25 axle problems guide explains how the ZF rear differs from the older 9.25.
Drive the truck and note when the noise happens: on throttle, on coast, or at all times. Then raise the rear and grab the pinion flange; any up-and-down or in-and-out movement points to worn pinion bearings or lost preload. Drain the oil and look at the drain plug and the cover. If the noise follows the wheels in turns rather than the throttle, check the axle bearings first, since that is a different repair. If the gears themselves are chipped or the truck is getting new ratio gears, the full kit is the right choice; if only the pinion side is leaking or loose on a low-mileage axle, the Yukon ZF 9.25 pinion install kit covers that end.
Yukon lists the YK C9.25ZF for 2011-and-up Chrysler 9.25 in. ZF rear axles. Dealer fitment shows:
It does not fit the older Chrysler-design 9.25 rear used in 2001-2010 Ram 1500, Durango and Dakota trucks, and it is not the AAM 9.25 front axle on heavy-duty Rams. Some 2011-2012 trucks were built during the changeover, so look at the axle tag or ring gear size, or send us your year, model and VIN and we will confirm before it ships. Pair it with the rest of our rebuild kits and axle parts as needed.
| Brand | Yukon Gear & Axle |
| Part number | YK C9.25ZF |
| Fits | Yukon Gear Master Overhaul Kit For 2011+ Chrysler 9.25in ZF Rear |
| Type | Differential Overhaul Kits |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. 2008 Rams use the older Chrysler-design 9.25 rear, which needs a different kit. This kit is for the ZF-built 9.25 rear found on 2011-2018 Ram 1500 and 2019-2020 Ram 1500 Classic.
Timken carrier bearings and races, Timken pinion bearings and races, a pinion seal, a complete shim kit, ring gear bolts, a pinion nut, a crush sleeve, thread locker, marking compound with a brush, and a gasket.
It is the most complete way to do it, because new gears need new bearings, a new crush sleeve and shims to set depth and backlash. If your carrier bearings are low mileage and you are only replacing the pinion side, the Yukon pinion install kit is the lighter option.
Not always. Whine that changes with throttle or coast usually points to the gears or pinion bearings. A growl that changes when you turn usually points to an axle bearing. Check pinion flange play and the gear oil for metal before tearing it down.
Yukon lists carrier bearings, pinion bearings and a pinion seal. Axle bearings and axle seals are not in the listed contents, so order them separately if yours are worn or leaking.
