Monroe 66440 Shock Absorber - Rear
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Monroe
 Magnum Shock Absorber

Monroe 66440 Shock Absorber - Rear

Brand Monroe 66440
Position Rear
Compressed Bumper Stop No
Compressed Length 12.38
Dust Shield Yes
Extended Bumper Stop No
Extended Hydraulic Lockout No
Extended Length 19.73
Lower Mounting Code LS51
Lower Mounting Type Loop Bushing & Sleeve Mount - 5/8"-16MM Sleeve ID X 1.9/16" Sleeve OAL
Parts Pack None
Travel Length 7.35
Upper Mounting Code LS51
Upper Mounting Type Loop Bushing & Sleeve Mount - 5/8" Sleeve ID X 1.9/16" Sleeve OAL
Product line Magnum Shock Absorber
Fits Ram · 24 vehicles

Gas-charged design. Delivers quicker response and a stable, more comfortable ride.

Dust shield included. Helps protect the shock absorber from road debris.

Loop bushing mounts. Uses sleeve-style ends for a secure, straightforward installation.

Cross-references Focus Auto Parts 347086, KYB 3450007 and 170258 for the same application. See all 9.

$57.07Free 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.

Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
Step 2 — Quantity
Shock Absorbers are typically replaced in pairs, axle by axle.
Order total $57.07
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Shock Absorber options

Monroe Magnum Shock Absorber 66440 for Ram ProMaster

The Monroe Magnum Shock Absorber 66440 is a gas-charged rear shock for Class 3-6 vehicles, built to deliver quicker response and a steadier ride. For Ram ProMaster 2500 and Ram ProMaster 3500 rear applications, this Monroe Magnum Shock Absorber 66440 helps replace worn suspension components that can contribute to vibration, uneven tire wear, and added operating costs.

Key Features

  • Gas-charged design for faster shock response and improved ride control
  • Rear suspension shock absorber for Ram ProMaster 2500 and Ram ProMaster 3500 applications
  • Dust shield included to help protect the shaft area from road debris
  • Loop bushing and sleeve mounts at both ends for a direct suspension fit
  • Extended length: 19.73 in; compressed length: 12.38 in; travel length: 7.35 in
  • Upper and lower mounting code: LS51

Product Details

Monroe Magnum is Monroe’s heavy-duty shock absorber line for demanding commercial use. The Magnum series focuses on stable damping response and consistent control under load, making it a practical choice for rear suspension service on Ram ProMaster vans. Part number 66440 is specified for rear use on 2021-2025 Ram ProMaster 2500 and 2021-2025 Ram ProMaster 3500, plus 2014-2020 Ram ProMaster 2500 and 2014-2020 Ram ProMaster 3500 with 1.38 in bore shocks. This part cross-references KYB 3450007 for the same application.

What It Helps Address

  • Excessive rear-end vibration
  • Loose or unsettled ride quality over rough pavement
  • Reduced tire life from worn shock damping
  • Increased downtime from suspension wear in commercial use
  • Higher cost per mile caused by degraded ride control

Installation Notes and Tips

Verify rear fitment by year, model, and bore specification before installation. Confirm the upper and lower loop bushing and sleeve mount style matches the vehicle’s existing hardware and mounting points. Inspect surrounding suspension components, bushings, and fasteners during replacement so the new shock can perform as intended on Ram ProMaster 2500 and Ram ProMaster 3500 rear applications.

Quality Assurance

Monroe Magnum shocks are engineered for commercial-duty suspension service and are built to support consistent damping performance in Class 3-6 vehicle applications. Part number 66440 is a direct-fit rear shock absorber for the listed Ram ProMaster fitments.

Related reading

This part fits 24 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2025RamProMaster 2500RearMagnum Shock Absorber
2025RamProMaster 3500RearMagnum Shock Absorber
2024RamProMaster 2500RearMagnum Shock Absorber
2024RamProMaster 3500RearMagnum Shock Absorber
2023RamProMaster 2500RearMagnum Shock Absorber
2023RamProMaster 3500RearMagnum Shock Absorber
2022RamProMaster 2500RearMagnum Shock Absorber
2022RamProMaster 3500RearMagnum Shock Absorber
2021RamProMaster 2500RearMagnum Shock Absorber
2021RamProMaster 3500RearMagnum Shock Absorber
2020RamProMaster 2500RearShocks are 1.38 (in) Bore; Magnum Shock Absorber
2020RamProMaster 3500RearShocks are 1.38 (in) Bore; Magnum Shock Absorber
2019RamProMaster 2500RearShocks are 1.38 (in) Bore; Magnum Shock Absorber
2019RamProMaster 3500RearShocks are 1.38 (in) Bore; Magnum Shock Absorber
2018RamProMaster 2500RearShocks are 1.38 (in) Bore; Magnum Shock Absorber
2018RamProMaster 3500RearShocks are 1.38 (in) Bore; Magnum Shock Absorber
2017RamProMaster 2500RearShocks are 1.38 (in) Bore; Magnum Shock Absorber
2017RamProMaster 3500RearShocks are 1.38 (in) Bore; Magnum Shock Absorber
2016RamProMaster 2500RearShocks are 1.38 (in) Bore; Magnum Shock Absorber
2016RamProMaster 3500RearShocks are 1.38 (in) Bore; Magnum Shock Absorber
2015RamProMaster 2500RearShocks are 1.38 (in) Bore; Magnum Shock Absorber
2015RamProMaster 3500RearShocks are 1.38 (in) Bore; Magnum Shock Absorber
2014RamProMaster 2500RearShocks are 1.38 (in) Bore; Magnum Shock Absorber
2014RamProMaster 3500RearShocks are 1.38 (in) Bore; Magnum Shock Absorber
Directly replaces or cross-references 9 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Focus Auto Parts — 347086KYB — 3450007170258121403115330164168157782AC68157782AD68157782AEHD12140552