KYB KG9004 Suspension Strut - Rear
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KYB
 Gas-a-just

KYB KG9004 Suspension Strut - Rear

Brand KYB KG9004
Position Rear
B-stop Y
Compressed Length 14.21
Dust Cover Included Y
Extended Length 21.57
Lower Mount Type E2(10X45)
R-stop Y
Stroke Length 7.36
Upper Mount Type S1
Product line Gas-a-just
Fits BMW · 7 vehicles

OE monotube replacement. Restores original suspension capability with gas-a-just design.

Fade-free operation. High-pressure monotube separates gas and oil for instant response.

Triple chrome piston rod. Helps reduce seal wear for smoother, longer-lasting performance.

Cross-references Gabriel G51007 and Monroe Shocks & Struts 71319 for the same application. See all 2.

$77.41Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
Free return shipping if it doesn't fit when you check fitment here first.

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Step 2 — Quantity
Suspension Struts are typically replaced in pairs, axle by axle.
Order total $77.41
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
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KYB Gas-a-just Rear Strut for BMW 320i

The KYB Gas-a-just KG9004 is a rear suspension strut built for 1977-1983 BMW 320i applications. It uses a monotube design with separate gas and oil chambers to deliver responsive damping, consistent control, and quick reaction to road inputs.

For BMW 320i owners looking for an OE-style rear strut replacement, the Gas-a-just line adds damping performance over original equipment while maintaining a controlled ride for daily driving.

Key Features

  • Fits 1977-1983 BMW 320i, rear
  • Part number KG9004
  • Monotube construction for fade-resistant operation
  • High-pressure nitrogen gas and hydraulic working chambers for instant response
  • Adds up to 25% more damping performance over original equipment shocks
  • Triple chrome plated piston rod helps reduce seal wear
  • Includes dust cover and bumper assembly
  • Designed for BMW 3 Series rear suspension applications

Product Details

The KYB Gas-a-just KG9004 is engineered as a monotube OE replacement for the rear of the BMW 320i. Its high-pressure gas design separates the gas and oil to reduce aeration and maintain consistent damping, while the floating piston helps deliver a comfortable ride during normal driving and firmer control when conditions demand it. The KG9004 is a practical choice for drivers who want sharper steering response and more stable suspension behavior from a rear strut replacement.

This part cross-references Monroe Shocks & Struts 71319 for the same application.

What It Helps Address

  • Rear suspension bounce or excessive body movement
  • Reduced damping control from worn original struts
  • Steering response that feels slow or unsettled
  • Fade caused by aeration in older twin-tube designs
  • Seal wear related to piston rod surface condition

Installation Notes and Tips

Verify rear fitment on your 1977-1983 BMW 320i before installation. The KG9004 uses lower mount type E2(10X45) and upper mount type S1, with compressed length, extended length, and stroke dimensions listed for application matching. KYB also recommends protecting new struts from dirt, debris, and salt with strut boot SB113.

Quality Assurance

KYB designs the Gas-a-just line as an OE monotube replacement to restore original vehicle capability with consistent damping performance. The KG9004 is built with a high-pressure monotube layout and a chrome piston rod to support long-term suspension control in the BMW 320i rear application.

Related reading

This part fits 7 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
1983BMW320iRearRecommended OEM Replacement; (E21); The KYB replacement unit comes with a new dustcover / bumper assembly.; Gas-a-just
1982BMW320iRearRecommended OEM Replacement; (E21); The KYB replacement unit comes with a new dustcover / bumper assembly.; Gas-a-just
1981BMW320iRearRecommended OEM Replacement; (E21); The KYB replacement unit comes with a new dustcover / bumper assembly.; Gas-a-just
1980BMW320iRearRecommended OEM Replacement; (E21); The KYB replacement unit comes with a new dustcover / bumper assembly.; Gas-a-just
1979BMW320iRearRecommended OEM Replacement; (E21); The KYB replacement unit comes with a new dustcover / bumper assembly.; Gas-a-just
1978BMW320iRearRecommended OEM Replacement; (E21); The KYB replacement unit comes with a new dustcover / bumper assembly.; Gas-a-just
1977BMW320iRearRecommended OEM Replacement; (E21); The KYB replacement unit comes with a new dustcover / bumper assembly.; Gas-a-just
Directly replaces or cross-references 2 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Gabriel — G51007Monroe Shocks & Struts — 71319