BIG BORE XD® Steering Gear - GMC 2500HD/3500HD 4WD (2011-2021) without Magnetic Speed Variable Assist
BIG BORE XD® Steering Gear - GMC 2500HD/3500HD 4WD (2011-2021) without Magnetic Speed Variable Assist
Part Number: SG037
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The PSC BIG BORE XD Steering Gear is built for GMC 2500HD and 3500HD 4WD without Magnetic Speed Variable Assist trucks that demand more steering control than the factory gearbox can deliver. Whether you're towing heavy loads, turning larger tires, or putting your truck through tough off-road conditions, this gearbox is designed to provide increased steering authority, improved durability, and a more confident feel behind the wheel.
Featuring PSC's large piston design and heavy-duty internal components, the BIG BORE XD helps deliver the steering assistance needed when tire size and vehicle weight push the limits of OE steering components. It's a proven upgrade for truck owners looking for stronger, more dependable steering performance both on and off the pavement.

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About:
Why you’ll love it
- Large piston design provides increased steering assist
- Helps reduce steering effort with oversized tires
- Built to handle towing, work, and off-road use
- Heavy-duty internal components for long service life
- Direct replacement for applicable factory steering gears
Tech Info
Heads‑up for installers
- Verify vehicle fitment before ordering.
- A steering gear swap should be followed by a front-end alignment inspection.
- Inspect steering linkage, pitman arm, and mounting hardware during installation.
- For trucks running larger tires, PSC recommends pairing with a Cylinder Assist® system for maximum steering performance.
- Follow factory procedures when removing and installing steering components.
Ideal for
- Heavy towing applications
- Oversized tire setups
- Work trucks
- Overland builds
- Trail and off-road use
- Customers replacing a worn factory steering gearbox
Specs
Series: BIG BORE XD
Steering Box Type: Recirculating Ball Steering Gear
Position: Steering Gear Box Replacement
Drive Configuration: 4WD
Vehicle Platform: GMC 2500HD/3500HD
What’s included
- (1) PSC BIG BORE XD Steering Gear
Support
OEM Cross Reference
Chevrolet — 19256662
Chevrolet — 19257732
Chevrolet — 19330691
Chevrolet — 22845815
Chevrolet — 22923379
Chevrolet — 23130417
Chevrolet — 23453443
GMC — 19330691
GMC — 22845815
GMC — 23130417
GMC — 23453443
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