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  • Black PSC steering gear SG856 angle 2 with a threaded output shaft, hex nut and washer displayed on a white background for detailed product presentation.
  • Black PSC steering gear SG856R with a threaded output shaft, hex nut and washer displayed on a white background for detailed product presentation.
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BIG BORE XD® Steering Gear - Ram 2500/3500 (2009-2026)

BIG BORE XD® Steering Gear - Ram 2500/3500 (2009-2026)

$1,395.00
$1,395.00
Sale Out of Stock
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Part Number: SG856R

Type

If you’re running a Ram 2500 or 3500 and your steering’s gotten sloppy, vague, or just plain worn out—PSC’s BIG BORE XD Steering Gear is the upgrade you need. This thing’s built like a tank and designed to handle the kind of abuse that makes stock steering gears tap out.

The SG856 gear features a massive 45 mm sector shaft and a larger lower support bearing, which all but eliminates side-to-side movement. That means tighter steering, better control, and no need for aftermarket steering braces. Inside, an 80mm piston assembly and 16:1 steering ratio deliver smooth, confident handling with about 3.5 turns lock-to-lock.

Whether you’re towing, off-roading, or just want your truck to feel solid again, this gear’s ready to work.

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About:About:

Why you’ll love it

  • Built for heavy-duty use – no more sloppy steering
  • 45 mm sector shaft – stronger than stock, no brace needed
  • 80 mm piston & 16:1 ratio – smooth, responsive feel
  • Direct fit replacement for multiple Mopar part numbers
  • Compatible with factory hoses and pitman arms

Tech InfoTech Info

Heads‑up for installers

This gear fits 2009–2024 RAM 2500/3500 2WD & 4WD trucks without LaneSense Lane Departure Warning. If your truck has LaneSense, this gear won’t work—double-check before ordering. It bolts up to factory high-pressure and return lines and works with both OEM and aftermarket pitman arms.

Fitment

  • Dodge/Ram 2500 & 3500 (2009–2024)
  • 2WD and 4WD models
  • Not compatible with LaneSense Lane Departure Warning

Specs

  • Steering Gear Model: SG856
  • Sector Shaft Diameter: 45 mm
  • Internal Piston: 80 mm
  • Steering Ratio: 16:1 (approx. 3.5 turns lock-to-lock)
  • Ports: Compatible with OEM high-pressure and return lines
  • Pitman Arm Compatibility: Works with factory and aftermarket arms
  • Finish: Black Painted Casting

What’s included

BIG BORE XD Steering Gear

SupportSupport

OEM Cross Reference

Direct replacement for:

  • Mopar 68575538AB
  • Mopar 52122316AC
  • Mopar 52122316AD
  • Mopar 52122315AD
  • Mopar 68575538AB Diesel Engines
  • Mopar 68575536AA Gas Hemi V8 Engines

Overall rating: 4.2 / 5 from 5 reviews.

AI Generated Review Summary

Summary topics

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Review highlights

Reviews

Excellent product

"Installed the BIG Bore steering box and intermediate shaft. Drives way better than when it was new. Steering is nice and tight, no wandering. Instalation is not that hard, just need the right tools, took maybe 3 hours."

— James S. (5/5)

works for sure

"had my box on for 30k miles so far. . fixed my wandering steering. it replaced my redhead. this one better. i will buy a new box again when its time."

— steve (5/5)

UPDATE TO MY FIRST REVIEW” please read”

"PSC completely took care of me. They paid the shop who did the work in full for the extra labor to install the new box. Not to mention sent the new box for free and very fast. Kelvin was an excellent help in the situation and I will be recommending PSC to anyone who wants to listen. My Ram drives and feels better than when it was new. Couldn’t be happier with my experience and the product. Definitely worth the money. I would delete my first review but can’t figure out how."

— Clay C. (5/5)

PLEASE READ BEFORE BUYING! BUYERS BEWARE

"I bought this for my 2013 Ram 2500. In February. It showed up relatively fast so that was nice. I had a very reputable shop in my area do the install because my truck was already in there getting front end work done. Shop installed it and followed instructions perfectly and even called PSC to confirm the steps he was following were correct. I get the truck back and drove it for a week and it was horrible, steering would pulse and at full lock it would feel like it was binding. I also noticed it looked like the box was seeping fluid out. I brought it back to the shop and the mechanic noticed that the box was leaking from the seal on top of box. Also noted that the box was in fact binding. I called PSC and they sent a box right away. The new box was installed and truck drives great. Here’s where PSC completely drops the ball and honestly probably lost a customer. My mechanic submitted a labor claim so I didn’t have to pay twice to get a part installed that was faulty from the factory, PSC has said they will not be paying it cause “They don’t pay labor claims” when it is completely their fault that the first box was faulty. I have honestly never left a bad review for a product so this is a first for me. I will be spreading the word about how PSC treats their customers that spend over $1000 for a part."

— Clay C. (1/5)

best upgrade for that steering wander

"ĺ🌟🌟🌟🌟🌟 After upgrading every steering component that dreaded steering wander still persists only after adding this big bore box the steering wander has finally subdued it got rid of that torque steering when hitting bumps or when the roads are flooded it would pull hard I also recommend to replace the steering wheel intermediate linkage to the heavy duty borgeson design it will best complement the new big bore box its nice that the big bore gets rid of the steering slop but without upgrading the intermediate shaft youll still have a slight side to side play in the steering very slight but noticeable with the borgeson upgraded intermediate shaft it gets rid of any and all slack completely I installed the big bore at home instructions were easy to comprehend and had no issues installing the unit by myself whatsoever the top notch quality and well packaged big bore shipped very fast especially to hawaii and im very pleased this product exists ive put about 40k miles on the new big bore unit and its still holding up strong feels tight from the first day it was installed absolutely zero play on 12. 5x35 -14offset you've a customer for life mahalo nui loa PSC!!! 🌟🌟🌟🌟🌟 👍"

— THC-KINGDOM-808 (5/5)

Q&A

California Prop 65 Warning

California Prop 65 Warning

This product can expose you to chemicals including lead and di (2-ethylhexyl) phthalate, which are known to the State of California to cause cancer, birth defects or other reproductive harm.

For more information, go to www.P65Warnings.ca.gov