Yukon Gear Ring Gear Bolt Kit For Toyota Landcruiser

Re-gearing a Land Cruiser for bigger tires, or tearing into a 9.5 inch differential that has started to whine, puts the ring gear fasteners back in your hands. Reusing them is a gamble: they have been heat cycled and torqued before, and one that stretches or backs off can let the ring gear walk on the carrier and destroy the whole gear set. The Yukon Gear and Axle MK TLC-RGBOLT is a fresh set of ring gear bolts and nuts for standard rotation Toyota Land Cruiser differentials, so the most important clamp in the axle starts out new.

What the ring gear bolts do in a Land Cruiser differential

The ring gear is bolted to a flange on the differential carrier, and every bit of torque that reaches the axle shafts passes from the pinion, into the ring gear, and through those fasteners into the carrier. Their clamping force is what keeps the ring gear tight and square on the flange. If the clamp is lost, the gear can move, the contact pattern changes and the bolts start to shear. On the Land Cruiser the ring gear is held with bolts and nuts rather than threading into the gear, and Yukon lists this kit as 12 bolts and 12 nuts, which is a full set for one gear.

Symptoms of tired or loose ring gear hardware

• A clunk or knock on and off the throttle that was not there before
• A whine whose pitch shifts because the gear is no longer running true on the carrier
• Bolt heads or nuts that are loose, rounded, or show fresh witness marks during an inspection
• Metal in the gear oil, or a cracked carrier flange after a fastener failure
• Original fasteners that have already been reused through one or more gear changes

How to confirm you need it

Drain the oil and look at what comes out. Fine gray paste is normal wear, but chips or bolt fragments mean the carrier comes out now. With the third member on the bench, check each fastener for looseness and thread damage. If you are installing new gears, plan on new bolts and nuts regardless of how the old ones look; the extra cost is small next to a ring and pinion set.

Fitment

Yukon lists the MK TLC-RGBOLT for standard rotation Toyota Land Cruiser differentials across the 1960-1968, 1969-1974, 1975-1990 and 1991-1997 model years, with the 4WD trucks called out for 1975 onward and the 1991-1997 trucks on the 30 spline differential. Some Land Cruiser axles use reverse rotation gears, and this kit is listed for standard rotation only, so match it to the gear set you are installing. If you are unsure which axle your truck has, send us the year and VIN before you order. More Land Cruiser differential parts are listed in our shop, including the Yukon YK TLC-B master overhaul kit for the 1991-1997 9.5 inch rear.

Install notes

• Clean the carrier flange and the back of the ring gear completely; a burr or a flake of old thread locker under the gear causes runout
• Use thread locker on the threads and tighten in a crisscross pattern in stages to the torque in your Toyota service manual
• Check ring gear runout before you set backlash and the contact pattern
• The YK TLC-B master kit does not include ring gear bolts, so this kit is its natural partner on a full rebuild
• Re-gearing on a budget with reusable bearings? Pair it with the Yukon MK TLC minor install kit
• Worn carrier or pinion bearings can be replaced with the Toyota 9.5 Land Cruiser differential bearing kit
• Planning a ratio change on a 1991-1997 truck without the factory locker? See the Yukon 4.88 gear and install kit package, and confirm what it includes before you order bolts twice
• Fill with the gear oil grade Toyota specifies for your axle, then drive gently for the first few hundred miles to break in new gears

What is in the Yukon MK TLC-RGBOLT kit?

Yukon lists it as 12 ring gear bolts and 12 nuts, a full set to mount one ring gear on a standard rotation Land Cruiser carrier.

Which Land Cruisers does it fit?

Yukon's fitment covers standard rotation Toyota Land Cruiser differentials from 1960 through 1997, with 4WD trucks listed from 1975 and the 30 spline differential for 1991-1997. Reverse rotation gear sets are not covered.

Can I reuse my old ring gear bolts?

It is not recommended. They have been stretched and heat cycled, and a loose ring gear can wreck a new gear set. New bolts are cheap insurance on any gear change or overhaul.

Does the YK TLC-B master overhaul kit include ring gear bolts?

No. Yukon notes the YK TLC-B does not include them, which is why this bolt kit is commonly ordered with it.

What torque do the ring gear bolts need?

Use the torque in the Toyota service manual for your year and axle, applied in a crisscross pattern in stages with thread locker on the threads.