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! You can run this gearbox for now with the included hydraulic caps, in preparation to add an assist ram later on. There are several companies providing these rams and DIY kits if you wish to make your own system with this gearbox and valve body.
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 2003-09 4×4 Ram 2500/3500.
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 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:
- 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.
- 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
- 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.
- 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.
- 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 2003-08 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.
- In some rare cases, the factory gearbox came with smaller M12 bolts that will need to be upgraded to M14 hardware. While this is a very rare circumstance, the factory frame sleeves are already sized for the larger hardware and all taht is needed is the 3 newer bolts. In some rare cases, the factory gearbox came with smaller M12 bolts that will need to be upgraded to M14 hardware. While this is a very rare circumstance, the factory frame sleeves are already sized for the larger hardware and all that is needed is the 3 new bolts.
- While this gearbox does not require changes to anything else, this is a very good time to upgrade your steering to the large sector shaft and 08.5+ T-style Mopar steering if you have not done so already. This does require a new Pitman arm. Even for those trucks who are running the adapter Pitman to run the 08.5+ steering on the original gearbox, we still STRONGLY recommend upgrading to the larger sector shaft and getting a new Pitman for it. The size difference between the factory sector shaft and the later upgrade version available on the 2010-13 trucks is huge, and many 03-08 sector shafts have snapped off completely at the gearbox interface, particularly when used with drop-pitman’s and tall lift kits.
For 2009 trucks:
- This upgrade does not require any changes to your truck. This can be run with stock hoses/fittings, power steering pump and fluid, pitman arm, steering linkage and gearbox bolts. Note that the 2009 model year was an oddball year with many unique parts; it is best to confirm which input type you have and that you have the large-output sector shaft for the 08.5-13 T-style steering. The input shaft can be checked by removing the bolt holding the input shaft to the gearbox, and checking if the input on the gearbox is either fully splined or is a D-style shaft with a flat face.