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  • Collection of steering parts including a steering gear, pump, hoses, pitman and idler arms and two PSC 715 bottles on a white background.
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BIG BORE XD® Steering Kit - GMC 2500 / 3500 6.6L Duramax (1999-2010)

BIG BORE XD® Steering Kit - GMC 2500 / 3500 6.6L Duramax (1999-2010)

$1,950.00
$1,950.00
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Part Number: SK339

If you’re tired of wrestling that big GMC around on the trail or hauling heavy loads, this kit is the real deal. Our BIG BORE XD Steering Kit gives your truck the muscle it needs to steer smooth and easy, even when you’re running big tires or working it hard.

We’ve packed this kit with everything you need to do it right the first time: a beefed-up Cylinder Assist Steering Gear, a high-performance pump with a remote reservoir, a stout assist cylinder with all the hardware, and a full install hose kit. Top it off with PSC 715 fluid, and you’ve got a system that’ll take the heat and keep on working.

This setup is built for guys who want reliability, strength, and a steering system that feels like it should’ve come from the factory this way. Whether you’re crawling rocks, towing, or just want to make your truck drive like a dream, this kit’s got your back.

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About:About:

Why you’ll love it

  • Big Tires? No Problem. Handles oversized tires without breaking a sweat.
  • Built to Last. Heavy-duty components that can take a beating.
  • Smooth Steering Feel. No more fighting the wheel on the trail or job site.
  • Complete Kit. Everything you need in one box—no guessing, no hunting for parts.

Tech InfoTech Info

Heads‑up for installers

  • This kit works with IFS trucks, but you’ll need a reduced-stroke cylinder (6.0"–6.5") for proper clearance.
  • A fluid cooler is highly recommended to keep temps in check and protect your pump.
  • Always use PSC 715 fluid for best performance and long life. 

Fitment

  • GMC 2500 / 3500 Heavy Duty
  • Engine: 6.6L Duramax 
  • Years: 1999–2010 
  • Works with Dana 60 straight axle conversions and IFS setups (with reduced-stroke cylinder).

Use it with

  • PSC 715 Power Steering Fluid (a must-have) 
  • PSC Fluid Cooler Kit for extra protection 
  • PSC High-Pressure Hose Upgrade for extreme builds

Specs

  • Steering Gear: BIG BORE XD Cylinder Assist
  • Pump: High-Performance Kit with Remote Reservoir
  • Cylinder: Assist Cylinder with Hardware
  • Recommended Fluid: PSC 715
  • Recommended Add-On: Fluid Cooler

What’s included

  • SG039: BIG BORE XD Steering Gear – GM 2500/3500 & Hummer H2 (1999–2010)
  • PK1404: High Performance Series Pump Kit – GMC 2500/3500 w/ 6.6L Duramax (1999–2010)
  • PA810: 99-06 GMC 2500/3500 HD XD Pitman Arm and Idler Arm Kit
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