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  • Steering kit with gear, cylinder, four PSC 715 bottles, pump, clevis joints, hoses, fittings, hardware, mounts, reservoir and clamp in front of a white background.
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BIG BORE XD® Cylinder Assist® Kit – GM 2500 / 3500 4WD – Straight Axle Conversion

BIG BORE XD® Cylinder Assist® Kit – GM 2500 / 3500 4WD – Straight Axle Conversion

$2,605.00
$2,605.00
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Part Number: SK336

Vehicle/Model Year

Swapping a Dana 60 under your GM 2500 or 3500 and want steering that can handle it? This BIG BORE XD Cylinder Assist Kit is built for straight axle conversions and off-road setups that need serious turning power. Whether you're rock crawling, trail running, or just want your steering to feel solid again, this kit gives you the muscle to turn big tires like they’re stock.

PSC’s been leading the way in Cylinder Assist systems for GM trucks, and this kit includes everything you need for a clean, bolt-on install—no guesswork, no piecing parts together. You’ll get our top-of-the-line steering gear, high-performance pump kit with remote reservoir, assist cylinder with hardware, and a hose kit to tie it all together.

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About:About:

Why you’ll love it

  • Built for straight axle conversions – no more steering struggles
  • Turns big tires with ease – even aired down on the trail
  • Complete kit – everything you need in one box 
  • PSC-trusted components – tested and trail-proven
  • PSC 715 fluid recommended – keeps things cool and smooth

Tech InfoTech Info

Heads‑up for installers

This kit is designed for Dana 60 straight axle conversions on 1988–1998 or 1999.5-2006 GM 2500/3500 4WD trucks. It can be installed on IFS trucks, but you’ll need a reduced stroke cylinder (6.0"–6.5") to make it work. A fluid cooler is highly recommended to protect your pump and keep the system running strong.

Fitment

  • GM 2500 & 3500 4WD (1988–1998)
  • GM 2500/3500 4WD trucks (1999.5-2006)
  • Straight axle conversions (Dana 60)
  • Can be adapted to IFS with reduced stroke cylinder

Use it with

  • GM 2500/3500 4WD trucks (1988–1998)
  • GM 2500/3500 4WD trucks (1999.5-2006) 
  • Dana 60 straight axle conversions 
  • PSC fluid coolers and PSC 715 Power Steering Fluid

Specs

  • Steering Gear: SG840R – Big Bore Cylinder Assist Steering Gear
  • Pump Kit: High-performance pump with remote reservoir
  • Cylinder: 1.5" PSC Assist Cylinder with hardware 
  • Hose Kit: Complete installation hose kit
  • Fluid: PSC 715 recommended
  • Compatibility: Straight axle conversion (IFS adaptable with reduced stroke)

What’s included

  • SG840R Cylinder Assist Steering Gear
  • High-Performance Pump Kit with Remote Reservoir
  • Steering Cylinder Assist Kit with Hardware
  • Steering Cylinder Assist Installation Hose 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