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AAM Announces New Ring and Pinion Gear Sets for 2014 and 2015 RAM 3500 Trucks

Posted: March 16, 2017

American Axle & Manufacturing announced the launch of new ring and pinion gear set kits that fit the 11.8" rear axles for the 2014 and 2015 RAM 3500 pickup trucks. RAM built a limited quantity of RAM 3500 pickup trucks with an 11.8" ring gear rear axle and a 6.7 L Diesel.

You will be able to identify this axle by the "11.8" marked in the webbing of the carrier. 

Below you will find the new ring and pinion gear set kit part numbers. Because these new pinion gears have unique threads, we will also include the pinion nut, collapsible spacer and pinion seal packed with the gear sets.  

Ring gear bolts are the same as previous years and must be purchased separately - #40022812 
  • D118373GSK1 - 3.73 ratio ring & pinion gear kit
  • D118410GSK1 - 4.10 ratio ring & pinion gear kit

The new part number sequence designates the "D" is for Dodge. The "118" is for the 11.8" ring gear. The "373" denotes the ratio. The GSK indicates this is a Gear Set Kit. The "kit" means it contains the pinion nut, spacer and pinion seal as well the ring and pinion gear. The "1" designation means it is the first version of this gear set. 

The following are the component parts of the kit besides the ring and pinion gear. 

  • Pinion Nut / #40126149
  • Collapsible Spacer / #40011051
  • Washer / #40003255
  • Pinion Seal / #40113398
 
The same 3 pinion helical gear designed limited slip differential case that is used with the 11.5" gear sets is also used with the 11.8" gear sets.
Part Number 40099548. 
 
The master bearing kit for the 11.8" rear axle is Part Number #74067024.

The same 11.5" aluminum cover pan kit also fits the rear axle with the 11.8" ring gear. 
 

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