Yukon Gear Master Overhaul Kit For Ford 7.25in Diff
Restoring a 1960s Falcon or Comet, a first-generation Mustang, or a 1970s Maverick or Pinto and the rear axle howls at cruise, clunks when you lift off the gas, or drips oil from the pinion? The small Ford 7.25 inch axle in those cars is now 50 to 60 years old, and most have never had a bearing replaced. The Yukon Gear and Axle YK F7.25 master overhaul kit gives you the bearings, races, seal, shims and setup hardware to bring that axle back to quiet, tight condition, or to set up a new ring and pinion.
In any hypoid axle, the pinion gear rides on two tapered roller bearings and the carrier rides on two more. A crush sleeve between the pinion bearings sets how tight the pinion turns, shims fix how deep the pinion sits in the ring gear, and the carrier shims set backlash and side-bearing load. On an axle this old, the bearings have usually lost their preload, the races are pitted from moisture and old oil, and the pinion seal has hardened. The result is gear noise and leaks that new oil will not fix.
Yukon lists the YK F7.25 contents as carrier bearings and races, pinion bearings and races, a pinion seal, a complete shim kit, a pinion nut, a crush sleeve, thread locker, marking compound with a brush, and silicone. The bearings and races are Timken. Ring gear bolts are not in this kit, so plan on new ones if you are installing gears or the old bolts are stretched.
First rule out tires, wheel bearings and the transmission. If the noise follows road speed and changes with throttle, it is very likely the axle. Our guide to whine on acceleration vs deceleration explains which bearing or gear each pattern points to, and the master overhaul kit buyers guide covers when a full kit makes more sense than a seal. With the car on stands, grab the yoke and check for play, then drain the oil and look at what comes out. Measuring backlash with a dial indicator and magnetic base before teardown gives you a reference for reassembly.
The YK F7.25 is listed for the Ford 7.25 inch rear axle in these vehicles: 1960-1970 Ford Falcon, 1960-1969 Mercury Comet, 1964-1970 Ford Mustang, 1967-1968 Ford Fairlane and Ranchero, 1970-1977 Ford Maverick and 1971-1977 Ford Pinto. Many of those cars were also built with other Ford axles, most often the 8 inch, which takes a different kit. Measure the ring gear, read the axle tag if it is still on the housing, or compare your old bearing numbers before you order. If you are unsure, send us the year, model and any axle tag or VIN details and we will check it first. Gear and axle parts for other units are in our rebuild kits category.
| Brand | Yukon Gear & Axle |
| Part number | YK F7.25 |
| Fits | Yukon Gear Master Overhaul Kit For Ford 7.25in Diff |
| Type | Differential Overhaul Kits |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
It fits the 1964-1970 Mustang only when the car has the Ford 7.25 inch rear. Many Mustangs of that era have the Ford 8 inch or 9 inch instead, which use different kits. Check the axle tag or ring gear size, or send us your details before ordering.
No. The YK F7.25 has the carrier and pinion bearings and races, pinion seal, shim kit, pinion nut, crush sleeve, thread locker, marking compound and silicone. Order ring gear bolts separately if you need them.
Yukon lists Timken bearings and races for this kit, along with its own seals and small parts.
If the axle is quiet and the yoke has no play, a seal alone may stop the leak. If there is whine, clunk or yoke play, the pinion bearings are worn and a new seal will usually start leaking again.
You need a bearing puller or separator, race drivers, a dial indicator for backlash and an inch-pound torque wrench for pinion preload. A shop press makes pinion bearing work much easier.
