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  • PSC Cylinder Assist® steering gear for your classic GM 4WD for a 1968–1976 or a 1977–1979 GM truck,
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XDR Cylinder Assist® Steering Gear – GM 4WD Crossover Steering

XDR Cylinder Assist® Steering Gear – GM 4WD Crossover Steering

$1,150.00
$1,150.00
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Part Number: SGX042SR

If you're running crossover steering on your classic GM 4WD and want better control, durability, and trail performance, PSC’s XDR Cylinder Assist Steering Gear is the upgrade you need. Designed specifically for full hydraulic assist setups, this gear delivers the strength and responsiveness serious off-roaders demand.

Whether you’ve got a 1968–1976 or a 1977–1979 GM truck, we’ve got the right fitment to match your steering geometry and frame configuration. Built tough and trail-proven, this gear is ready to handle oversized tires, rugged terrain, and everything in between.

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Tech InfoTech Info

Heads‑up for installers

  • 1968–1976 models use a 13/16"–36 spline input shaft
  • 1977–1979 models use a 3/4"–30 spline input shaft and a 2WD pitman arm for crossover steering
  • Both versions mount outside the frame using a 4-bolt pattern
  • Equipped with -6AN male ports for connecting a PSC Steering Assist Cylinder
  • PSC 715 fluid recommended for all PSC systems

Fitment

  • GM Full-Size Trucks/SUVs (1968–1979)
  • 2WD and 4WD models with crossover steering conversions
  • Outside-the-frame mounting

Specs

1968–1976 Version:

  • Input Shaft: 13/16"–36 spline
  • Piston Diameter: 3.25"
  • Turns Lock-to-Lock: 3.5
  • Port Type: SAE Inverted Flare
  • Mounting: 4-bolt, outside-the-frame
  • Cylinder Assist Ports: -6 AN male

1977–1979 Version:

  • Input Shaft: 3/4"–30 spline
  • Piston Diameter: 3.125"
  • Turns Lock-to-Lock: 3.3
  • Port Type: SAE Inverted Flare
  • Mounting: 4-bolt, outside-the-frame
  • Uses 2WD pitman arm for crossover steering
  • Cylinder Assist Ports: -6 AN male

What’s included

  • PSC XDR Cylinder Assist Steering Gear
  • Pre-installed Cylinder Assist fittings
  • Model-specific configuration
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