Yukon Gear Master Overhaul Kit For Nissan Titan Rear Diff
A Nissan Titan that whines from the back at 50 to 70 mph, clunks when you get on and off the throttle, or keeps wetting the driveshaft with gear oil is telling you the rear differential bearings are worn. The Yukon Gear and Axle YK NM226 is the master overhaul kit for the Nissan M226 rear differential, the Dana 44-based axle under the Titan. It is new and in stock, and it gives you every bearing, race, shim and seal you need to rebuild the center section or install a new ring and pinion in one order.
The M226 is a carrier-in-housing axle with a bolt-on rear cover. The pinion turns on two tapered roller bearings, held at a set preload by a collapsible crush sleeve and the pinion nut. The carrier sits on two side bearings, and the shims behind those bearings fix backlash and side-bearing preload. Pinion depth is also set with a shim. Everything that keeps the gears meshing in the right spot depends on those bearings staying tight. Once they wear, the pinion can walk under load, the contact pattern moves off the center of the teeth and the gears begin to sing. Left alone, the noise turns into gear damage.
Yukon lists the kit contents as carrier bearings and races, 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 silicone for the cover. The bearings and races are Timken.
Note whether the noise follows road speed and changes with throttle; that points to the differential rather than tires or the transmission. Our guide on whine on acceleration vs deceleration explains what each pattern means, and bad transmission vs bad differential noise covers the Titan owner who is not sure which end is making it. Then drain the oil, check the magnet, unbolt the driveshaft and rock the flange. With the cover off, a quick backlash reading with a dial indicator and magnetic base gives you a baseline before teardown.
Yukon lists YK NM226 for the Nissan M226 rear differential and sells it as the Titan rear overhaul kit. Nissan changed the pinion from 29 splines on 2004-2007 Titans to 24 splines on 2008 and later trucks, which matters for the flange; check the old bearing and race numbers to confirm this bearing set matches your axle, especially if it has been regeared. Yukon's related M226 tables also list some 2003-2007 Frontier 4WD and Pathfinder RWD models with the M226 rear, but many Frontiers have a smaller axle, so check the axle tag or the build sheet first. Not sure? Send us your year and VIN before you order. The USA Standard ZK NM226 kit is the lower-cost alternative for the same axle, and it adds oil baffles, slingers and a gasket.
| Brand | Yukon Gear & Axle |
| Part number | YK NM226 |
| Fits | Yukon Gear Master Overhaul Kit For Nissan Titan Rear Diff |
| Type | Differential Overhaul Kits |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Yukon lists one M226 rear overhaul kit for the Titan. The pinion spline count changed in 2008, which affects the flange, so compare your old bearing and race numbers or send us your VIN and we will confirm before it ships.
No. The kit has the bearings, races, pinion seal, shims, ring gear bolts, pinion nut, crush sleeve, thread locker, marking compound and silicone. Gear sets are sold separately.
Both fit the M226 rear. The Yukon kit uses Timken bearings; the USA Standard kit uses Koyo bearings and adds oil baffles, slingers and a gasket.
If the only problem is a leak and the flange does not rock, a seal can be enough. If there is whine, clunk or flange play, the pinion bearings are worn and a new seal will start leaking again soon.
Yukon's chart lists 15-25 in-lb rotating torque with new bearings and 8-12 in-lb when reusing bearings. Tighten the nut in small steps and check often; an over-crushed sleeve must be replaced.
