Hydraulic-Assist XHD Steering Gearbox Upgrade, 2010-18 Ram 2500/3500


  1. Vastly improved steering system and gearbox life
  2. High-flow custom valve body
  3. Plug-and-Play fit to your trucks’ input and output shafts
  4. Massive, upgraded main bearings (45mm vs factory 35mm) provides a huge improvement in strength and lifespan
  5. 3.25 turns Lock-to-Lock (stock ratio for 2010-present trucks)
  6. Does not require upgraded power steering pump or a steering brace


NOTE: This is for the Gearbox w/ Valve Body only; this does not include the full hydraulic ram and mounting kit. We will have the plug-and-play mounting kits for all years coming out shortly!

Manufactured by PSC, this gearbox utilizes a 100% BRAND NEW current-generation Mopar ‘Big Box’ that is custom machined to accept heavily oversized bearings, at a price that is equivalent to (or even cheaper!) than a stock gearbox or other companies’ remanufactured box. This gearbox is the strongest and most durable option out there for any Ram 2500/3500 truck, and is built to order for your trucks’ configuration. Will fit any 2010-18 4×4 Ram 2500/3500 and some current-model 2wd trucks with solid front axles.

In addition to the box itself being heavily overbuilt, PSC went to the extreme and developed a high-flow valve body for these gearboxes. No longer is the user required to drill holes in their gearbox and hope they don’t ruin the internals or their power steering pump with metal chips floating around! The valve body bolted to this gearbox has integral ports for hydraulic lines, and provides greatly improved flow rates for a far more effective and responsive hydro-assist steering system.

Hydro-Assist Steering: This is the ultimate steering setup for Ram HD trucks, for applications ranging across all uses; daily drivers, work trucks, heavy tow rigs, high-speed desert runners, low speed rock crawlers. The addition of Hydro-Assist steering is a major complement to the stock steering setup by reducing wear on steering components (steering gearbox, steering shaft, trackbar, drag link) while also reducing driver input and maintaining reliability of the vehicle as a whole. Very different from full-hydraulic steering, hydro-assist steering is the best of both worlds.  This system benefits stock vehicles noticeably, and will be a very nice improvement for those owners who tow or who intend to run large tires. Details below:

  1. You maintain the mechanical connection between the steering wheel and the tires so if a fluid leak occurs you will still have the ability to steer.
  2. You maintain the sharp response of a mechanical connection, with steering input being initiated by the drag link, but prolong the life of your steering components by having most of the force provided by the hydraulic ram
  3. Reduces body sway. With most of the force being between the axle and the tie rod, we remove most of the push between the frame-mounted gearbox and the tie-rod, removing a large amount of body sway. This is especially nice if you run a soft swaybar, or none at all, or if you have a high center of gravity.
  4. Steering response above idle is the same or faster than stock steering speed. Steering speed at-idle is slightly slower. Steering is now much easier than in the stock configuration, and is an excellent felt improvement for these trucks.
  5. By adding the hydraulic ram at the tie-rod we are now able to apply most of the steering force with the fewest joints between applied force and the tires. This greatly reduces wear on your drag link and your gearbox. In a stock steering configuration, all steering force travels through the tie rod, but is provided by the drag link and gearbox pushing on it. In a hydro-assist configuration, all steering force still travels through the tie rod, except now the force is taken off of the gearbox and the drag link and is provided mostly by the hydraulic ram


For 2010-18 trucks

  • This upgrade still does not require any changes to your truck. This can be run with stock hoses/fittings, power steering pump and fluid, pitman arm, and steering linkage.

Additional information

Model Year

2010-2013, 2014-2018