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  • Overhead view of a black steering gear with a machined input and output shaft, accompanied by a washer and hex nut positioned below the gear on a white background.
  • Angled view of a black steering gear with visible input and output shafts, showing precision-machined details and red alignment marks on a white background.
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BIG BORE XD® Steering Gears – GM 2500/3500 & Hummer H2 (1999–2010)

BIG BORE XD® Steering Gears – GM 2500/3500 & Hummer H2 (1999–2010)

$1,095.00
$1,095.00
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Shipping calculated at checkout.

Part Number: SG039

Ports

The factory steering gear in these trucks has always been a weak spot—until now. PSC’s BIG BORE XD Steering Gear is built to handle the demands of lifted trucks, oversized tires, and serious off-road use. With a beefed-up 45mm sector shaft and upgraded roller bearings, this gear eliminates the deflection and seal failures that plague OEM units. 

Whether you’re running a standard setup or PSC’s Cylinder Assist system, we’ve got the gear for you. All-new components, no remanufactured parts, and PSC’s proven durability make this a must-have upgrade for your GM 2500/3500 or Hummer H2. 

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About:About:

Why you’ll love it

  • SG039R is available for setups running a PSC Cylinder Assist Steering System.
  • SG039 requires a PA806 4-Master Spline Pitman Arm—don’t forget to grab one if you don’t already have it.

Tech InfoTech Info

Heads‑up for installers

  • Requires PA806 4-Master Spline Pitman Arm.
  • Make sure to flush and bleed the system properly. 
  • Cylinder Assist version includes ports for ram assist plumbing. 

Fitment

  • Vehicles: GM 2500/3500 4x4 & Hummer H2
  • Years: 1999–2010
  • Note: SG039R is for use with PSC Cylinder Assist® systems.

Specs

  • Sector Shaft: 45mm diameter 
  • Bearings: Upgraded roller bearings 
  • Ports: Standard or Cylinder Assist® (SG039R)
  • Build: All-new components, not remanufactured

What’s included

(1) BIG BORE XD Steering Gear (choose standard or Cylinder Assist)

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