Axles - Differentials | 2011-2016 GM 6.6 Duramax LML

The 2011-2016 Duramax equipped 2500HD and 3500 trucks feature an IFS (Independent Front Suspension) AAM 9.25" assembly up front and either an AAM 11.5 or 11.8 out back. The 2011-2012 models were equip ... read more

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Yukon Gear & Axle GM 9.25" IFS Ring and Pinion Gear Set 01-19 GM Duramax YUK-YG_GM925-342R-Main 0.00

Yukon Gear & Axle YG GM9.25-342R

Yukon Gear & Axle GM 9.25" IFS Ring and Pinion Gear Set 01-19 GM Duramax $ 392.89 2050-01-01

Looking to upgrade your AGM's AAM 9.25 ring and pinon to keep your truck performing with bigger tires? Grab this Yukon Ring and Pinon and be amazed with the quality and durability! Yukon Master Overhaul Kit 11-19 GM 2500HD / 3500 GM 9.25" IFS YUK-YK_GM925IFS-B 9.09

Yukon Gear & Axle YK GM9.25IFS-B

Yukon Master Overhaul Kit 11-19 GM 2500HD / 3500 GM 9.25" IFS $ 888.89 2050-01-01

Power Products carries the Yukon Master Overhaul Kit for 2011+ GM 9.25" IFS Yukon Master Overhaul Kit 11-19 GM / 11-18 Ram 11.5" YUK-YK_GM115-B 8.00

Yukon Gear & Axle YK GM11.5-B

Yukon Master Overhaul Kit 11-19 GM / 11-18 Ram 11.5" $ 749.89 2050-01-01

Whether you're replacing your ring and pinion or it's just time for a rebuild, Yukon builds the BEST overhaul kits on the market, actually making your front or rear end STRONGER than stock! ARB On-Board High Performance 12 Volt Air Compressor ARB-CKSA12 8.00

ARB CKSA12

ARB On-Board High Performance 12 Volt Air Compressor $ 241 2050-01-01

This permanently mounted air compressor is specifically designed to be used with the installation of ARB Air Lockers. This kit comes complete with a full wiring loom with air locker solenoid plug in contact, mounting hardware with reinforcing bracket, and a quality compressor isolating switch. ARB CKMA12 On-Board High Performance 12 Volt Air Compressor ARB-CKMA12 12.00

ARB CKMA12

ARB CKMA12 On-Board High Performance 12 Volt Air Compressor $ 338 2050-01-01

The ARB Heavy Duty Compressor is a life saver by delivering available air on tap whenever you need it. ARB On-Board High Performance 12 Volt Twin Air Compressor ARB-CKMTA12 22.00

ARB CKMTA12

ARB On-Board High Performance 12 Volt Twin Air Compressor $ 616 2050-01-01

The ARB Twin Air Heavy Duty Compressor is a life saver by delivering available air on tap whenever you need it. ARB One Gallon Air Tank ARB-171507 12.00

ARB 171507

ARB One Gallon Air Tank $ 178 2050-01-01

This air tank is to be used specifically with the ARB On-Board Air Compressors to improve their efficiency by giving more available air volume. ARB Air Locker AAM 11.5" 14-Bolt ARB-RD139 57.00

ARB RD139

ARB Air Locker AAM 11.5" 14-Bolt $ 1158 2050-01-01

No more compromising with your AAM 11.5" equipped truck, the ARB Air Locker provides the ultimate in traction for off-road use, but delivers the streetability of an open differential. Yukon Steel Spool AAM 11.5" 30 Spline YUK-YP_FSGM115-30 45.00

Yukon Gear & Axle YP FSGM11.5-30

Yukon Steel Spool AAM 11.5" 30 Spline $ 1568.89 2050-01-01

Get 100% traction to both tires for the ultimate in traction for your American Axle 11.5" rear end. Yukon Steel Spool 11.5" with Upgraded 38 Splines YUK-YP_FSGM115-38 45.00

Yukon Gear & Axle YP FSGM11.5-38

Yukon Steel Spool 11.5" with Upgraded 38 Splines $ 1568.89 2050-01-01

Get 100% traction to both tires for the ultimate in traction for your 11.5" with 38 spline axles. ARB E-Z Deflator Kit ARB505 2.00

ARB ARB505

ARB E-Z Deflator Kit $ 54 2050-01-01

Looking for an easy way to deflate your tires? ARB's E-Z deflator will do the trick with it's quick and easy tire deflation and accurate pressure readings. PPE Heavy Duty Rear Aluminum Differential Cover 03-18 Cummins / 01-19 Duramax PPE-138051000-main 0.00

PPE (Pacific Performance Eng.) 138051000

PPE Heavy Duty Rear Aluminum Differential Cover 03-18 Cummins / 01-19 Duramax $ 287.99 2050-01-01

Keep your diff running cool with this simple to install PPE Differential Cover.

Description

The 2011-2016 Duramax equipped 2500HD and 3500 trucks feature an IFS (Independent Front Suspension) AAM 9.25" assembly up front and either an AAM 11.5 or 11.8 out back. The 2011-2012 models were equipped with the long standing 11.5 that had been used since 2001, but the 2013 models were upgraded to an 11.8" ring gear for increased strength. From the factory, these housings were typically stuffed with the popular 3.73 ratio, but also had other options, such as a 4.10 used primarily for heavier towing, in most cases.

Over the years, these assemblies have proven themselves relatively reliable on moderately used trucks running stock, or close to stock tire size and power output. For those of us that demand substantial power increases and larger tires, there is room for improvement to improve the reliability and performance that they can afford. One of the best upgrades we can recommend for anyone that has increased tire size, is that of a ring and pinion ratio upgrade. As previously stated, most of these trucks came factory with a 3.73 ratio, designed to have a proper run out with a stock size tire (roughly 32"). But as soon as you upgrade to a 37" or larger tire, all of a sudden your RPM vs. speed are effected, even causing a disruption of the shift pattern on automatic transmission equipped trucks.

Lets give the example of upgrading to a 37" tire. By using cross multiplication, we can determine that in order to have the same RPM vs. speed as with the factory tire size, you would want to install a 4.31 gear ratio (3.73/32*37). Unfortunately, in this scenario there is no such thing as a 4.31 ratio, but darn close would be a 4.30 that is readily available. Or, you can also opt to go with a slightly lower ratio of 4.56 that would give you a higher RPM vs. speed compared to stock, which is especially useful for those towing frequently.

Besides replacing the ring and pinion, we also offer numerous other upgrades, such as ARB Air Lockers, rebuild kits, and so much more. As always, if you have any questions about which product is right for you and your truck don't hesitate to give us a call or send us an e-mail to [email protected] and we would be happy to help.

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