Revolution Gear & Axle 98-04 GM 14-Bolt 10.5in Rear Axle Ring & Pinion Master Install Kit

If you are regearing a Chevrolet or GMC 3/4-ton or 1-ton truck or van with the 10.5 in. 14-bolt full-floating rear, or the center section has started to howl after years of towing, the gears are only half the job. The Revolution Gear & Axle 35-2023B is the master install kit for the later, 1998-and-newer version of that axle: new Timken pinion and carrier bearings with their races, plus the seal, shims, crush sleeve and hardware needed to set a ring and pinion up correctly the first time. It is a new kit, not a reman bundle.

What the 35-2023B does in a 10.5 14-bolt

On a full-floater the hubs carry the truck's weight on the axle tubes, so the center section only has to deal with torque, but on a 14-bolt that is a lot of torque. The pinion is held by two large tapered bearings with a crush sleeve between them, and the carrier rides on two side bearings that set backlash through shims. When any of those bearings wear, the pinion moves away from the ring gear under load and the contact pattern runs off the edge of the teeth. New gears installed on old bearings tend to whine within a few thousand miles, which is why a master kit is the standard partner for a regear. Revolution lists this kit with pinion bearings, carrier bearings, pinion shims, carrier shims, a crush sleeve, a pinion seal, ring gear bolts and cover gasket or silicone. Axle seals are not included.

Symptoms that point to the center section

• A whine or howl at cruise that rises and falls with throttle, louder when loaded or towing
• A different tone on coast than on acceleration, often a sign the pinion preload has gone loose
• Clunk or in-and-out play at the pinion yoke
• Gear oil slung on the yoke and driveshaft from a tired pinion seal
• Glitter or chunks on the drain plug magnet after a long tow season

How to confirm it before you buy

Rule out the hubs first. Raise the rear, rock each tire top to bottom and spin it by hand; a full-floater hub bearing makes a grinding or rumbling noise that changes in turns, while gear and pinion bearing noise follows load. Drain the oil and look at it, then pull the cover and check backlash and the tooth pattern. Our 14-bolt problems and rebuild cost guide walks through what usually fails and what a rebuild involves. If the noise is at the wheel ends, you want the 14-bolt hub bearing and seal kit instead.

Fitment

The listing covers the 1998-2004 GM 10.5 in. 14-bolt, and the manufacturer now catalogs this kit for 10.5 14-bolt axles from 1998 through 2017. Its vehicle table names 1999-2000 C2500 and C3500, Silverado and Sierra 2500 HD through 2017, Silverado 3500 through 2006 and Yukon XL 2500. Be careful: GM put a 9.5 in. semi-float 14-bolt under many lighter trucks, and a large share of 2001-and-later 2500 HD and 3500 pickups came with the American Axle 11.5, which also wears a 14-bolt cover. Our 14-bolt vs AAM 11.5 comparison shows how to tell them apart. If yours is the 11.5, the 35-2024 11.5 master kit is the right one. Earlier 14-bolts (1997 and older) use different bearings. Check the axle tag or RPO code, or send us the year and VIN and we will confirm before it ships.

Install notes

• Pair the kit with the ratio you are running, for example a 4.11 ring and pinion for the 14-bolt or the 5.38 thick gear set for big tires.
• Revolution's published GM 10.5 setup figures are 20-35 in-lb pinion preload with new bearings, 0.006-0.010 in. backlash, 120 ft-lb on the ring gear bolts and 135 ft-lb on the carrier caps.
• Check the old pinion nose (pilot) bearing in the housing when you tear down, and press in a new one if it is rough.
• Tighten the pinion nut in small steps and measure turning torque each time; if you overshoot, the crush sleeve has to be replaced. Our pinion depth and backlash guide covers reading the pattern.
• Fill with 75W-90 or 75W-140 gear oil, and add friction modifier only if a clutch-type limited slip calls for it.
• Follow a proper ring and pinion break-in: easy miles, no towing early, and an early oil change.

More 14-bolt bearings and kits are in our rebuild kits section.

Does the 35-2023B fit a 2005 Silverado 2500 HD?

Only if that truck has the GM 10.5 in. 14-bolt. Many 2001-and-later 2500 HD pickups have the American Axle 11.5 instead, which uses the 35-2024 kit. Check the ring gear size or axle code, or send us the VIN and we will confirm.

Are axle seals included?

No. Revolution lists this kit without axle seals. On a full-floater the hub seals live at the wheel ends, so if you are servicing the hubs at the same time, add a 14-bolt hub bearing and seal kit.

Do I need this kit if I am only changing the gear ratio?

Yes, in practice. New gears need new pinion and carrier bearings, a new crush sleeve and the right shims to set depth, preload and backlash. Reusing worn bearings is the most common reason a fresh regear starts to whine.

What gear oil should I use after the rebuild?

A quality 75W-90 or 75W-140 gear oil. Add friction modifier only if the carrier is a clutch-type limited slip that needs it. Change the oil early, after the break-in miles, to flush out the wear-in particles.

What bearing brand is in the kit?

Revolution lists Timken bearings for the 35-2023B, including both pinion bearings and both carrier bearings with their races.