SELECT YOUR VEHICLE
  • Big Bore XD®‑JL Cylinder Assist® black steering gear and pitman arm for Jeep JL and Gladiator JT on a white background.
1 1

BIG BORE XD®‑JL Cylinder Assist® Steering Gear – Jeep JL/JT (2018–2022)

BIG BORE XD®‑JL Cylinder Assist® Steering Gear – Jeep JL/JT (2018–2022)

$1,450.00
$1,450.00
Sale Out of Stock
Shipping calculated at checkout.

Part Number: SG689R

The Big Bore XD‑JL Cylinder Assist steering gear is built for Jeep JL and Gladiator JT owners who need stronger steering control and long‑term reliability when running larger tires or seeing real off‑road use.

This steering gear is designed to work with a Cylinder Assist ram, taking load off the internal gear and transferring it where it belongs. The bigger piston area provides improved steering force while maintaining proper on‑center feel, giving you a steering system that holds up without losing precision.

Built as a direct bolt‑in upgrade, the XD‑JL steering gear installs without reinventing the front end and integrates cleanly with PSC Cylinder Assist systems.

View full details

About:About:

Why you’ll love it

  • Designed specifically for Cylinder Assist steering setups
  • BIG BORE XD internals improve strength and durability
  • Reduces internal gear load when running assist
  • Maintains predictable on‑center steering feel
  • Direct bolt‑in for Jeep JL and JT platforms

Tech InfoTech Info

Heads‑up for installers

  • Intended for use with a Cylinder Assist system
  • Proper hose routing and ram alignment are critical
  • Alignment should be checked after installation
  • Bleed the steering system thoroughly

Fitment

  • Jeep Wrangler JL
  • Jeep Gladiator JT
  • Model years 2018–2022

Ideal for

  • Jeep JL and JT builds with larger tires
  • Off‑road and trail use
  • Vehicles running Cylinder Assist steering
  • Drivers looking for improved steering durability

Specs

  • Steering Gear Type: Cylinder Assist compatible
  • Series: BIG BORE XD‑JL
  • Application: Jeep JL / JT
  • Mounting: Direct bolt‑in

What’s included

(1) BIG BORE XD‑JL Cylinder Assist steering gear

Overall rating: 5.0 / 5 from 1 reviews.

AI Generated Review Summary

Summary topics

Review topics: [].

Review highlights

Reviews

I put 90k miles on

"I put 90k miles on my Gladiators stock aluminum steering box, I always knew it was sloppy, but… With 3. 5 inches of lift and 38s, driving at highway speeds into anything over a stiff breeze made me feel like a drunken sailor lol! 10 out of 10 for the PSC Big Bore XD steering box, highly recommend"

— Jayson D. (5/5)

Q&A

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