Revolution Gear & Axle 14-18 RAM 2500/3500 11.5in-9.25in Reverse Cut 4.56 Ratio Gear Package
If you have put 35 to 37 inch tires on a 2014-2018 Ram 2500 or 3500 and the truck now feels lazy pulling away, hunts between gears on the highway, or struggles to hold a gear towing up a grade, the factory axle ratio is no longer matched to the tire. This Revolution Gear & Axle 4.56 package (REV-RAM-2500-3500-11.5-18-456) re-gears both axles at once: the AAM 9.25 inch reverse-cut front and the AAM 11.5 inch rear, so the front and rear ratios stay matched for four-wheel drive.
The ring and pinion in each axle set the final drive ratio. A numerically higher ratio like 4.56 turns the driveshaft more times for every turn of the tire, which gives back the leverage that taller tires take away. On a 4x4 Ram the front and rear axles have to carry the same ratio, or the transfer case binds as soon as 4WD is engaged. That is why this package is sold as a set: front ring and pinion, front master install kit, rear ring and pinion and rear master install kit, with Timken bearings in the master kits. The rear gears use the proven 2013-and-earlier 11.5 inch gear design, and the kit supplies the updated pinion bearings and crush sleeve that let those gears sit correctly in the 2014-2018 housing.
Check your current ratio first. The axle tag on the cover bolt or the build sheet for your VIN gives it, and counting driveshaft turns against one tire turn with the truck on stands confirms it. If you are chasing a noise rather than a tire size change, pull the rear cover and look at the ring gear teeth and the fluid before you spend money; a single failed bearing may only need the 2014-up Ram AAM 11.5 master overhaul kit rather than new gears. Wheel bearing noise from the rear axle ends is also common on these trucks and is easy to confuse with gear whine.
This package is listed for 2014-2018 Ram 2500 and 3500 single rear wheel trucks with the AAM 11.5 inch rear axle and AAM 9.25 inch front axle. It is not for trucks with the Aisin heavy-duty transmission, which use the larger 11.8 inch rear axle, and it is not for dual rear wheel trucks. 2003-2010 trucks need the 2003-2010 Dodge 2500/3500 4.56 package instead, because the earlier housings and front carriers differ. Read the axle tag on both housings and, if you are unsure, send us your year and VIN before ordering. You can browse more parts for these axles on the hard parts page.
Gear setup is precision work. Each axle needs pinion depth set with shims, pinion bearing preload set against the new crush sleeve, carrier bearing preload, and backlash, then a contact pattern check with marking compound on both the drive and coast side of the teeth. Expect to press bearings on and off the pinion and carrier, so most owners have a driveline shop do it. Ring gear bolts get thread locker and the factory torque; do not reuse a crushed sleeve. Fill each axle to the bottom of the fill plug with the synthetic GL-5 grade listed in your owner's manual; Ram's rear specification varies by configuration, so check the manual or axle tag rather than guessing. Break new gears in gently: no towing and no long full-throttle pulls for the first few hundred miles, then change the gear oil early to remove setup wear metal.
While both axles are open, it is the right time to replace the rear 11.5 inch axle bearings and seals, since the master install kits cover the gear and carrier bearings, not the wheel ends. A heavy-duty 11.5 inch diff cover is also worth adding if the truck sees rocks or trail use. After the job, recalibrate the speedometer and shift points for the new ratio and tire size.
| Brand | Revolution Gear & Axle |
| Part number | REV-RAM-2500-3500-11.5-18-456 |
| Fits | Revolution Gear & Axle 14-18 RAM 2500/3500 11.5in-9.25in Reverse Cut 4.56 Ratio Gear Package |
| Vehicle fitment | RAM 2500/3500 11.5In-9.25In Reverse Cut (2014-2018) |
| Type | Differential Install Kits |
| 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. It is listed for single rear wheel 2500 and 3500 trucks with the AAM 11.5 inch rear. Dually and Aisin-transmission trucks use the 11.8 inch rear axle and need different gears.
4.56 is a common choice for HD Rams running roughly 35 to 37 inch tires, especially if the truck tows. Your current ratio, engine and how much you tow all matter, so compare RPM at your normal cruising speed before choosing.
On a 4x4, yes. The front and rear must share the same ratio or the drivetrain binds in 4WD. That is why this package includes front and rear gears and both master install kits.
Front ring and pinion, front master install kit, rear ring and pinion and rear master install kit, with Timken bearings. Wheel bearings and axle seals at the rear axle ends are separate.
Yes. Change the tire size and axle ratio in the vehicle programming with a tuner or dealer tool so the speedometer, shift points and stability control use the correct values.
