PSC Steering Big Bore XD2 Cylinder Assist Steering Gearbox - SG688R

universal fit logo


  • PSC Steering | Part Number: PSMSG688R
  • Fitment:Direct Fit
  • Availability:In Stock


PSC's Exclusive Big Bore XD2 Power Steering Gearbox is an essential, critical steering component for any Jeep JK with increased torque loads such as large tire sizes up to 37 Inches, locking front differentials, and larger aftermarket axles.

Tech:The Big Bore XD2 Power Steering Gearboxes require a high flow rate, 1650 PSI Power Steering Pump for the best service life.

PSC PN PK1853 for 2007-11 Jeep JK 3.8L EGH
PSC PN PK1858 for 2012-2018 Jeep JK 3.6L Pentastar

High Mileage or Aftermarket Remanufactured OEM power steering pumps DO NOT meet the required flow rate specifications which may result in premature failure of the steering gearbox.

PSC recommends the use of a fluid cooler to prevent catastrophic damage to the power steering pump.

The dimensionally larger size of the Big Bore XD2 series may interfere with some aftermarket track bars.

HEMI Conversions may present tight clearance tolerances if the air conditioning or OEM power steering pump is located on the bottom driver side of the engine.

LS3 Conversions may require modification/clearancing of the alternator bracket.

We're working on getting more reviews for this product. In the meantime, here's what people are saying about 4WP



Question & Answers

0 Answered question


Headquartered in Fort, Texas, Performance Steering Components (PSC) grew out of founder Tom Allen's business to re-manufacture rack & pinion steering gears originally launched over 30 years ago. He graduated to custom steering gear and system builds for off-road and racing applications and the business grew. Now, PSC Motorsports boasts over 200 dealers and its sales staff maintains an avid interest in off-road related innovations and events. 4WD carries a wide spectrum of PSC products for Jeeps including power steering conversion kits, Jeep steering boxes and Jeep hydraulic steering assists to keep your trips on and off the trail safe and smooth. Shop PSC Steering Now


Lowest Price! Guaranteed!

Sign up to receive deals by email!

Sign up to receive deals by text!

Please Enter valid number

By submitting, you agree to receive recurring autodialed marketing text msgs (e.g. cart reminders) to the mobile number used at opt-in from 4 Wheel Parts (4WP) on 21208. Consent is not a condition of purchase. Msg frequency may vary. Msg & data rates may apply. Reply HELP for help and STOP to cancel. See Terms and Conditions & Privacy Policy