Monroe

Magnum OE Replacement Shocks

66618
$65.99

Out of Stock
Monroe

Magnum OE Replacement Shocks

66618
$65.99

Out of Stock
Authorized dealer
Free shipping on orders above $250 within the lower 48 United States
Brand new parts with warranty coverage
Free 30-day return and exchange on qualifying orders
Got Questions?
Our experts are here to help!
Part Numbers & Details
1 Shock Absorber
Package contains a single shock.
Monroe Limited Lifetime Warranty
Manufacturer provided lifetime warranty and exclusive Feel the Difference Guarantee.
Factory Hardware for Installation
All necessary washers, bushings, and nuts included. Factory shock mounting bolts are reused for installation.
Designed for Trucks and Vans
Engineered for hardworking full-size trucks and vans and features full-displaced valving on compression cycles to deliver controlled ride and handling
Heavy Duty Build
Heavy-duty nitrocarburized rod (non-dust shield units only) and sintered iron piston enhance durability for longer service life while self-lubricating fluid seal reduces friction against piston rod to reduce wear
Nitrogen gas charge
Maintains tire-to-road contact for improved ride and handling by reducing aeration and shock fade
Specifications
Part NumberLift/LoweredPositionItemQuantityExtended LengthCompressed LengthTravelTop MountBottom Mount
66618FactoryRearShock Absorber121.5"13.38"8.13"EYELETEYELET
Product Details

Designed for midsize and full-size trucks and vans, Monroe Gas-Magnum shock absorbers provide firm control without a harsh ride. With up to twice the fluid capacity of standard 1-in. bore shocks, they work more efficiently with less effort.

Compatibility List
YearMakeModelDrivePosition
1995ChevroletW4500 TiltmasterRear
1994ChevroletW4500 TiltmasterRear
1993ChevroletW4500 TiltmasterRear
1992ChevroletW4500 TiltmasterRear
2005FreightlinerFL80Rear
2009GMCW4500 ForwardRear
2008GMCW4500 ForwardRear
2007GMCW4500 ForwardRear
2006GMCW4500 ForwardRear
2005GMCW4500 ForwardRear
2004GMCW4500 ForwardRear
2003GMCW4500 ForwardRear
2002GMCW4500 ForwardRear
2001GMCW4500 ForwardRear
2000GMCW4500 ForwardRear
1999GMCW4500 ForwardRear
1998GMCW4500 ForwardRear
1997GMCW4500 ForwardRear
1996GMCW4500 ForwardRear
1995GMCW4500 ForwardRear
1994GMCW4500 ForwardRear
1993GMCW4500 ForwardRear
1992GMCW4500 ForwardRear
2008GMCW5500 ForwardRear
2007GMCW5500 ForwardRear
2006GMCW5500 ForwardRear
2005GMCW5500 ForwardRear
2004GMCW5500 ForwardRear
2003GMCW5500 ForwardRear
2002GMCW5500 ForwardRear
2001GMCW5500 ForwardRear
2000GMCW5500 ForwardRear
1999GMCW5500 ForwardRear
1998GMCW5500 ForwardRear
1997GMCW5500 ForwardRear
1996GMCW5500 ForwardRear
1995GMCW5500 ForwardRear
1994GMCW5500 ForwardRear
1993GMCW5500 ForwardRear
1992GMCW5500 ForwardRear
1991GMCW5500 ForwardRear
1990GMCW5500 ForwardRear
1989GMCW5500 ForwardRear
1988GMCW5500 ForwardRear
2018IsuzuNPRRear
2017IsuzuNPRRear
2016IsuzuNPRRear
2015IsuzuNPRRear
2014IsuzuNPRRear
2013IsuzuNPRRear
2012IsuzuNPRRear
2011IsuzuNPRRear
2010IsuzuNPRRear
2009IsuzuNPRRear
2008IsuzuNPRRear
2007IsuzuNPRRear
2006IsuzuNPRRear
2005IsuzuNPRRear
2004IsuzuNPRRear
2003IsuzuNPRRear
2002IsuzuNPRRear
2001IsuzuNPRRear
2000IsuzuNPRRear
1999IsuzuNPRRear
1998IsuzuNPRRear
1997IsuzuNPRRear
1996IsuzuNPRRear
1995IsuzuNPRRear
1994IsuzuNPRRear
1993IsuzuNPRRear
1992IsuzuNPRRear
1991IsuzuNPRRear
1990IsuzuNPRRear
1989IsuzuNPRRear
1988IsuzuNPRRear
1987IsuzuNPRRear
1986IsuzuNPRRear
2019IsuzuNQRRear
2018IsuzuNQRRear
2017IsuzuNQRRear
2016IsuzuNQRRear
2015IsuzuNQRRear
2014IsuzuNQRRear
2013IsuzuNQRRear
2012IsuzuNQRRear
2011IsuzuNQRRear
2010IsuzuNQRRear
2009IsuzuNQRRear
2008IsuzuNQRRear
2007IsuzuNQRRear
2006IsuzuNQRRear
2005IsuzuNQRRear
2004IsuzuNQRRear
2003IsuzuNQRRear
2002IsuzuNQRRear
2001IsuzuNQRRear
2000IsuzuNQRRear
2019IsuzuNRRRear
2018IsuzuNRRRear
2017IsuzuNRRRear
2016IsuzuNRRRear
2015IsuzuNRRRear
2014IsuzuNRRRear
2013IsuzuNRRRear
2012IsuzuNRRRear
2011IsuzuNRRRear
2010IsuzuNRRRear
2009IsuzuNRRRear
2008IsuzuNRRRear
2007IsuzuNRRRear
2006IsuzuNRRRear
2005IsuzuNRRRear

Monroe Manufacturer's Warranty

DRiV warrants qualifying Monroe products against defects and wear-out when used on private passenger cars and light trucks under normal operating conditions, for as long as such original purchaser owns the vehicle on which they were originally installed.

Qualifying Products

  • Monroe OESpectrum shocks and struts
  • Monroe Reflex shocks and struts
  • Monroe Quick-Strut assembly
  • Monroe Gas-Magnum shocks
  • Monroe Magnum loaded strut assembly
  • DRiV's obligation under this warranty is limited to replacement of the worn-out or defective product in accordance with this warranty. Cost of removal and installation are not included, and any incidental and consequential damages are excluded under this warranty, regardless of when the failure occurs. This warranty has no cash value.

    To make a claim under this warranty, return the worn-out or defective product with the dated original receipt to the dealer or retailer from whom it was purchased.

    This warranty does not apply to purchases made through unauthorized retailers/dealers including unauthorized online sellers. DRiV has no way to confirm the authenticity and quality of products sold through unauthorized resellers and is not obligated to honor warranty claims when purchased from an unauthorized individual, unauthorized retailer/dealer, or unauthorized online retailer. Purchases made through auction sites, marketplaces, private or third-party sales, or other unauthorized online retailers are not eligible for warranty.

    This warranty does not apply to: (i) any other costs, including costs of removal, installation, diagnostic time, and any other expenses arising out of replacing the product (ii) products which have been installed on non-catalogued applications; (iii) products that are new, unused or show signs of normal wear but not defective; (iv) products which have been misused, modified, altered, improperly applied or installed; (v) product damaged in an accident or by fire, weather, or any other force majeure event or hazard; (vi) products which have been installed on vehicles used for commercial, fleet, Governmental or racing purposes or damaged due to vehicle modifications; (vii) obsolete parts no longer available from DRiV; (viii) product that has been transferred from the vehicle on which it was originally installed; (ix) non-geniune DRiV branded product or competitive parts; and (x) products installed on vehicles that have been modified outside the specifications of the vehicle’s original equipment manufacturer, including but not limited to aftermarket modifications for racing, off-road, or powersports purposes.

    DRiV will not accept any returns and is not responsible for any claims related to circumstances and products described in the preceding sentence. All warranties, express or implied, are disclaimed if not stated herein. Any implied warranties you may have under state law are limited to the same duration and other terms as this warranty to the extent permissible.

    DRiV will contact warranty-serviced consumers to conduct customer satisfaction surveys relating to product and warranty service. Survey activity will provide valuable feedback and help measure the level of consumer satisfaction in different markets.

    Shipping Info

    Free Shipping on most orders to the lower 48 U.S. states. Truck freight items (over 100 lbs) and custom orders require a separate shipping quote.

    • Applies to items like axles, leaf springs, and long-travel kits.
    • No international shipping on freight items — only to U.S.-based freight forwarders.
    • Worldwide shipping available: Canada, Europe, UAE, Australia, and most of Asia.

    Contact us for an international shipping quote.

    Returns & Exchanges

    30-Day Return Policy — Items must be new, unused, uninstalled, and include all original hardware.

    • No restocking fees for exchanges or gift card credit.
    • 10% restocking fee on refunds, returns cost us real money, so the 10% helps keep the lights on.
    • Installed, damaged, or dirty parts cannot be returned.
    • Any returns missing hardware or miscellaneous items, the return will be denied and returned to the buyer at the buyer's expense.

    Need help? Use Live Chat or Email Us anytime.

    Start a Return or Exchange

    Return Shipping Responsibility

    CHECKOUT+ Package and Order Protection plan provides prepaid return labels for any returned packages, this fee varies by product.

    • Our mistake (misboxed, wrong item, damaged): We cover the cost of return shipping.
    • Buyer mistake (wrong item ordered, fitment error, changed mind): Return shipping is the buyer's responsibility - unless CHECKOUT+ Package Protection has been purchased.

    • Under 50 lbs: Discounted carrier rate
    • Over 50 lbs: Discounted carrier rate + $25 oversize fee

    Refunds

    Refunds are issued within 5–7 business days of receiving your return.

    • Funds typically post to your account in 1–3 business days depending on your payment method.
    • There is a 10% restocking fee on all refunds. We don’t get our original shipping, labor, or transaction fees back — so the 10% restocking fee keeps the lights on.
    • You will receive an email once your refund is processed.

    International Orders

    • All international orders are final sale.
    • Returns via freight forwarders only accepted if the product hasn’t left the U.S.
    • Import taxes, duties, and other possible import-related fees are the buyer’s responsibility and not included in our shipping charges.
    • We are not responsible for goods once exported outside the U.S.

    Product Details

    Whether you want to upgrade, add a reservoir, or find something more affordable, contact us with any questions!

    Part Numbers & Details

    View full product specifications

    Close specs
    Part Numbers & Details
    1 Shock Absorber
    Package contains a single shock.
    Monroe Limited Lifetime Warranty
    Manufacturer provided lifetime warranty and exclusive Feel the Difference Guarantee.
    Factory Hardware for Installation
    All necessary washers, bushings, and nuts included. Factory shock mounting bolts are reused for installation.
    Designed for Trucks and Vans
    Engineered for hardworking full-size trucks and vans and features full-displaced valving on compression cycles to deliver controlled ride and handling
    Heavy Duty Build
    Heavy-duty nitrocarburized rod (non-dust shield units only) and sintered iron piston enhance durability for longer service life while self-lubricating fluid seal reduces friction against piston rod to reduce wear
    Nitrogen gas charge
    Maintains tire-to-road contact for improved ride and handling by reducing aeration and shock fade
    Specifications
    Part NumberLift/LoweredPositionItemQuantityExtended LengthCompressed LengthTravelTop MountBottom Mount
    66618FactoryRearShock Absorber121.5"13.38"8.13"EYELETEYELET
    Product Details

    Designed for midsize and full-size trucks and vans, Monroe Gas-Magnum shock absorbers provide firm control without a harsh ride. With up to twice the fluid capacity of standard 1-in. bore shocks, they work more efficiently with less effort.

    Compatibility List
    YearMakeModelDrivePosition
    1995ChevroletW4500 TiltmasterRear
    1994ChevroletW4500 TiltmasterRear
    1993ChevroletW4500 TiltmasterRear
    1992ChevroletW4500 TiltmasterRear
    2005FreightlinerFL80Rear
    2009GMCW4500 ForwardRear
    2008GMCW4500 ForwardRear
    2007GMCW4500 ForwardRear
    2006GMCW4500 ForwardRear
    2005GMCW4500 ForwardRear
    2004GMCW4500 ForwardRear
    2003GMCW4500 ForwardRear
    2002GMCW4500 ForwardRear
    2001GMCW4500 ForwardRear
    2000GMCW4500 ForwardRear
    1999GMCW4500 ForwardRear
    1998GMCW4500 ForwardRear
    1997GMCW4500 ForwardRear
    1996GMCW4500 ForwardRear
    1995GMCW4500 ForwardRear
    1994GMCW4500 ForwardRear
    1993GMCW4500 ForwardRear
    1992GMCW4500 ForwardRear
    2008GMCW5500 ForwardRear
    2007GMCW5500 ForwardRear
    2006GMCW5500 ForwardRear
    2005GMCW5500 ForwardRear
    2004GMCW5500 ForwardRear
    2003GMCW5500 ForwardRear
    2002GMCW5500 ForwardRear
    2001GMCW5500 ForwardRear
    2000GMCW5500 ForwardRear
    1999GMCW5500 ForwardRear
    1998GMCW5500 ForwardRear
    1997GMCW5500 ForwardRear
    1996GMCW5500 ForwardRear
    1995GMCW5500 ForwardRear
    1994GMCW5500 ForwardRear
    1993GMCW5500 ForwardRear
    1992GMCW5500 ForwardRear
    1991GMCW5500 ForwardRear
    1990GMCW5500 ForwardRear
    1989GMCW5500 ForwardRear
    1988GMCW5500 ForwardRear
    2018IsuzuNPRRear
    2017IsuzuNPRRear
    2016IsuzuNPRRear
    2015IsuzuNPRRear
    2014IsuzuNPRRear
    2013IsuzuNPRRear
    2012IsuzuNPRRear
    2011IsuzuNPRRear
    2010IsuzuNPRRear
    2009IsuzuNPRRear
    2008IsuzuNPRRear
    2007IsuzuNPRRear
    2006IsuzuNPRRear
    2005IsuzuNPRRear
    2004IsuzuNPRRear
    2003IsuzuNPRRear
    2002IsuzuNPRRear
    2001IsuzuNPRRear
    2000IsuzuNPRRear
    1999IsuzuNPRRear
    1998IsuzuNPRRear
    1997IsuzuNPRRear
    1996IsuzuNPRRear
    1995IsuzuNPRRear
    1994IsuzuNPRRear
    1993IsuzuNPRRear
    1992IsuzuNPRRear
    1991IsuzuNPRRear
    1990IsuzuNPRRear
    1989IsuzuNPRRear
    1988IsuzuNPRRear
    1987IsuzuNPRRear
    1986IsuzuNPRRear
    2019IsuzuNQRRear
    2018IsuzuNQRRear
    2017IsuzuNQRRear
    2016IsuzuNQRRear
    2015IsuzuNQRRear
    2014IsuzuNQRRear
    2013IsuzuNQRRear
    2012IsuzuNQRRear
    2011IsuzuNQRRear
    2010IsuzuNQRRear
    2009IsuzuNQRRear
    2008IsuzuNQRRear
    2007IsuzuNQRRear
    2006IsuzuNQRRear
    2005IsuzuNQRRear
    2004IsuzuNQRRear
    2003IsuzuNQRRear
    2002IsuzuNQRRear
    2001IsuzuNQRRear
    2000IsuzuNQRRear
    2019IsuzuNRRRear
    2018IsuzuNRRRear
    2017IsuzuNRRRear
    2016IsuzuNRRRear
    2015IsuzuNRRRear
    2014IsuzuNRRRear
    2013IsuzuNRRRear
    2012IsuzuNRRRear
    2011IsuzuNRRRear
    2010IsuzuNRRRear
    2009IsuzuNRRRear
    2008IsuzuNRRRear
    2007IsuzuNRRRear
    2006IsuzuNRRRear
    2005IsuzuNRRRear
    Warranty

    View warranty coverage

    Close specs

    Monroe Manufacturer's Warranty

    DRiV warrants qualifying Monroe products against defects and wear-out when used on private passenger cars and light trucks under normal operating conditions, for as long as such original purchaser owns the vehicle on which they were originally installed.

    Qualifying Products

  • Monroe OESpectrum shocks and struts
  • Monroe Reflex shocks and struts
  • Monroe Quick-Strut assembly
  • Monroe Gas-Magnum shocks
  • Monroe Magnum loaded strut assembly
  • DRiV's obligation under this warranty is limited to replacement of the worn-out or defective product in accordance with this warranty. Cost of removal and installation are not included, and any incidental and consequential damages are excluded under this warranty, regardless of when the failure occurs. This warranty has no cash value.

    To make a claim under this warranty, return the worn-out or defective product with the dated original receipt to the dealer or retailer from whom it was purchased.

    This warranty does not apply to purchases made through unauthorized retailers/dealers including unauthorized online sellers. DRiV has no way to confirm the authenticity and quality of products sold through unauthorized resellers and is not obligated to honor warranty claims when purchased from an unauthorized individual, unauthorized retailer/dealer, or unauthorized online retailer. Purchases made through auction sites, marketplaces, private or third-party sales, or other unauthorized online retailers are not eligible for warranty.

    This warranty does not apply to: (i) any other costs, including costs of removal, installation, diagnostic time, and any other expenses arising out of replacing the product (ii) products which have been installed on non-catalogued applications; (iii) products that are new, unused or show signs of normal wear but not defective; (iv) products which have been misused, modified, altered, improperly applied or installed; (v) product damaged in an accident or by fire, weather, or any other force majeure event or hazard; (vi) products which have been installed on vehicles used for commercial, fleet, Governmental or racing purposes or damaged due to vehicle modifications; (vii) obsolete parts no longer available from DRiV; (viii) product that has been transferred from the vehicle on which it was originally installed; (ix) non-geniune DRiV branded product or competitive parts; and (x) products installed on vehicles that have been modified outside the specifications of the vehicle’s original equipment manufacturer, including but not limited to aftermarket modifications for racing, off-road, or powersports purposes.

    DRiV will not accept any returns and is not responsible for any claims related to circumstances and products described in the preceding sentence. All warranties, express or implied, are disclaimed if not stated herein. Any implied warranties you may have under state law are limited to the same duration and other terms as this warranty to the extent permissible.

    DRiV will contact warranty-serviced consumers to conduct customer satisfaction surveys relating to product and warranty service. Survey activity will provide valuable feedback and help measure the level of consumer satisfaction in different markets.

    Shipping & Returns

    Free shipping within the lower 48 United States

    Close specs

    Shipping Info

    Free Shipping on most orders to the lower 48 U.S. states. Truck freight items (over 100 lbs) and custom orders require a separate shipping quote.

    • Applies to items like axles, leaf springs, and long-travel kits.
    • No international shipping on freight items — only to U.S.-based freight forwarders.
    • Worldwide shipping available: Canada, Europe, UAE, Australia, and most of Asia.

    Contact us for an international shipping quote.

    Returns & Exchanges

    30-Day Return Policy — Items must be new, unused, uninstalled, and include all original hardware.

    • No restocking fees for exchanges or gift card credit.
    • 10% restocking fee on refunds, returns cost us real money, so the 10% helps keep the lights on.
    • Installed, damaged, or dirty parts cannot be returned.
    • Any returns missing hardware or miscellaneous items, the return will be denied and returned to the buyer at the buyer's expense.

    Need help? Use Live Chat or Email Us anytime.

    Start a Return or Exchange

    Return Shipping Responsibility

    CHECKOUT+ Package and Order Protection plan provides prepaid return labels for any returned packages, this fee varies by product.

    • Our mistake (misboxed, wrong item, damaged): We cover the cost of return shipping.
    • Buyer mistake (wrong item ordered, fitment error, changed mind): Return shipping is the buyer's responsibility - unless CHECKOUT+ Package Protection has been purchased.

    • Under 50 lbs: Discounted carrier rate
    • Over 50 lbs: Discounted carrier rate + $25 oversize fee

    Refunds

    Refunds are issued within 5–7 business days of receiving your return.

    • Funds typically post to your account in 1–3 business days depending on your payment method.
    • There is a 10% restocking fee on all refunds. We don’t get our original shipping, labor, or transaction fees back — so the 10% restocking fee keeps the lights on.
    • You will receive an email once your refund is processed.

    International Orders

    • All international orders are final sale.
    • Returns via freight forwarders only accepted if the product hasn’t left the U.S.
    • Import taxes, duties, and other possible import-related fees are the buyer’s responsibility and not included in our shipping charges.
    • We are not responsible for goods once exported outside the U.S.

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