PSC SGX041SR CYLINDER ASSIST STEERING GEARBOX, 1977-79 GM 4WD WITH CROSSOVER STEERING

Product Description

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Upgrade the steering performance of your classic GM 4WD truck with the PSC SGX041SR Cylinder Assist Steering Gearbox. Designed specifically for 1977–1979 GM trucks equipped with crossover steering, this high-performance gearbox delivers superior control, improved steering feel, and exceptional durability when running oversized tires or heavy off-road setups.

The PSC SGX Series steering gearboxes are engineered from all-new components rather than remanufactured parts, ensuring maximum reliability and performance. Featuring a large 3.125-inch piston assembly, a heavy-duty 45mm sector shaft bearing, and durable billet aluminum top and end covers, the SGX041SR is designed to handle the increased steering loads commonly found in lifted trucks and rock-crawling rigs. Integrated -6AN ports allow easy installation of a PSC hydraulic assist cylinder whenever additional steering power is needed. 

Whether your truck is a trail-ready rock crawler, a heavy-tire street build, or a restoration with modern steering performance in mind, the PSC SGX041SR delivers smooth steering response and dependable operation under extreme conditions.

Key Features

• All-new PSC SGX Series steering gearbox (not remanufactured)
• Large 3.125" piston for increased steering torque
• Heavy-duty 45mm sector shaft bearing for durability
• -6AN hydraulic ports for PSC steering assist cylinder
• Billet aluminum top and end covers
• Variable steering ratio 13-16:1
• Approximately 3.3 turns lock-to-lock
• Designed for crossover steering conversions
• Built for oversized tires, lockers, and off-road loads

Fitment

Vehicle Compatibility

• 1977 Chevrolet K10 / K20 / K30 4WD – With crossover steering conversion
• 1978 Chevrolet K10 / K20 / K30 4WD – With crossover steering conversion
• 1979 Chevrolet K10 / K20 / K30 4WD – With crossover steering conversion
• 1977 GMC K15 / K25 / K35 4WD – With crossover steering conversion
• 1978 GMC K15 / K25 / K35 4WD – With crossover steering conversion
• 1979 GMC K15 / K25 / K35 4WD – With crossover steering conversion

Compatible with GM full-size trucks and SUVs running crossover steering systems. Designed for use with a 2WD pitman arm in crossover steering setups.

Frequently Asked Questions

What is a cylinder assist steering gearbox?

A cylinder assist steering gearbox includes ports that allow the addition of a hydraulic assist cylinder. This cylinder reduces steering effort and improves control when running large tires, heavy axles, or extreme off-road setups.

Does the PSC SGX041SR come with a hydraulic assist cylinder?

No. The gearbox is designed with integrated -6AN ports so a PSC steering assist cylinder can be added later if desired.

Is this gearbox new or remanufactured?

The PSC SGX Series gearboxes are built from all-new components rather than rebuilt cores, ensuring improved durability and performance.

Why upgrade to a PSC steering gearbox?

PSC steering gearboxes are engineered for trucks running larger tires, upgraded suspension, or off-road use. They provide stronger internal components and improved steering feel compared to stock units.

Specifications for psc SGX041SR