Revolution Gear & Axle GM 14-Bolt 11.5in 4.10 Ratio Ring & Pinion Set
Revolution Gear & Axle GM11.5-410 is a 4.10 ring and pinion for the GM/AAM 11.5 inch full-float rear axle, the 14-bolt-cover housing found under heavy-duty Chevrolet Silverado and GMC Sierra 2500HD and 3500 pickups and under 2003-2013 Ram 2500 and 3500 trucks. People land on this part for two reasons: the rear end has started to howl after years of towing, or the truck went to taller tires and now feels lazy pulling a trailer away from a stop. A fresh 4.10 set fixes both.
The 11.5 uses a large pinion driven straight off the rear driveshaft. Its teeth mesh with the 11.5 inch ring gear bolted to the carrier, and the carrier drives the full-floating axle shafts. The ratio, 4.10 here, means the driveshaft turns 4.10 times for every turn of the rear wheels. On a heavy truck that number decides how hard the transmission has to work: too tall a ratio for the tire size and load, and the transmission hunts for gears, the torque converter stays unlocked longer and fluid temperatures climb. Per Revolution, this set has a 30-spline pinion, standard rotation, 12 ring gear bolts with 9/16 inch threads, no carrier break and 8620 steel construction.
Bearing wear on these axles is common and can sound like bad gears. A steady drone that does not change with throttle usually points to bearings; a whine that changes between acceleration and deceleration points to gear contact. Our acceleration vs deceleration whine guide walks through the road test, and the AAM 11.5 problems and rebuild cost guide covers what usually wears out. If the axle only needs bearings, the gears may be reusable. To pick the ratio, multiply your current ratio by the old tire diameter and divide by the new one: a truck on 3.73 gears that moves to tires about 10 percent taller drives like it has roughly 3.39, and 4.10 brings it back to about where it started. If the truck already has 4.10 gears and they are worn, this is a like-for-like replacement.
This set fits the GM/AAM 11.5 inch rear with a 14-bolt cover and a 30-spline pinion. Do not confuse it with the older GM 14-bolt 10.5 inch axle, which uses a different gear set; our 14-bolt vs AAM 11.5 comparison shows how to tell them apart. Revolution sells separate gear sets for the 2019-up GM 11.5 and for the 2014-and-newer coil-spring Ram 2500, and 2014-up Ram 3500 dually trucks moved to the 11.8 inch axle, so those trucks need a different part. Read the ring gear size and ratio from the axle tag, or send us your year and VIN and we will confirm it. If you want more torque multiplication for very large tires or heavy off-road use, the 4.56 version of this 11.5 set is the next step down. Browse every axle part in our hard parts category.
Never reuse old bearings with new gears. For 2010-and-older axles, pair this set with the 03-10 GM/Dodge 11.5 master install kit; the 2011-up axle uses different pinion bearings, so use the 2011-up 11.5 master overhaul kit instead. Revolution's setup chart for the GM 11.5 lists a 0.055 inch starting pinion shim, 20-30 in-lb of pinion bearing preload with new bearings, 0.006-0.010 inch backlash, 175 ft-lb on the ring gear bolts and 200 ft-lb on the bearing caps. Check the contact pattern with marking compound before final assembly; a pinion depth setting tool saves several teardown cycles. Break the gears in gently: Revolution calls for conventional GL-5 gear oil during break-in, no towing for the first 500 miles and an oil change at 500 miles. Our ring and pinion break-in procedure has the step-by-step version.
| Brand | Revolution Gear & Axle |
| Part number | GM11.5-410 |
| Fits | Revolution Gear & Axle GM 14-Bolt 11.5in 4.10 Ratio Ring & Pinion Set |
| Type | Ring & Pinions |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. The 2019-up GM heavy-duty 11.5 axle uses its own gear set. This GM11.5-410 is for the earlier GM/AAM 11.5 14-bolt rear. Send us your year and VIN if you are not sure which axle you have.
It fits the AAM 11.5 used under 2003-2013 Ram 2500 and 3500 trucks. The 2014-up coil-spring Ram 2500 needs a different 11.5 gear set, and 2014-up Ram 3500 dually trucks use the 11.8 inch axle.
A master install kit with new pinion and carrier bearings, shims, crush sleeve, pinion seal and ring gear bolts. Use the 03-10 kit for 2010-and-older axles and a 2011-up kit for newer trucks, since the pinion bearings changed.
Both have 14-bolt covers. Check the ring gear size stamped on the axle tag or ask us with your VIN. The 10.5 inch GM 14-bolt and the 11.5 inch AAM use completely different gear sets.
Revolution recommends a conventional, non-synthetic GL-5 gear oil during break-in with a change at 500 miles. After break-in, refill with the viscosity your owner's manual specifies for the rear axle.
Do the tire math. Multiply your factory ratio by your original tire diameter and divide by the new tire diameter, then pick the ratio that brings you back near stock. 4.56 turns the engine about 11 percent faster than 4.10 at the same speed.
