Monroe

Magnum OE Replacement Shocks

66145
$65.99

In Stock

Estimated Delivery in 3-7 business days

Monroe

Magnum OE Replacement Shocks

66145
$65.99

In Stock

Estimated Delivery in 3-7 business days

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
66145FactoryCabShock Absorber113.13"9.13"4"EYELET/SLEEVEEYELET/SLEEVE
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
2007MackCLCab
2007Peterbilt357Cab
2006Peterbilt357Cab
2005Peterbilt357Cab
2004Peterbilt357Cab
2003Peterbilt357Cab
2002Peterbilt357Cab
2001Peterbilt357Cab
2000Peterbilt357Cab
1999Peterbilt357Cab
1998Peterbilt357Cab
1997Peterbilt357Cab
1996Peterbilt357Cab
1995Peterbilt357Cab
1994Peterbilt357Cab
1993Peterbilt357Cab
1992Peterbilt357Cab
1991Peterbilt357Cab
1990Peterbilt357Cab
2018Peterbilt367Cab
2017Peterbilt367Cab
2016Peterbilt367Cab
2015Peterbilt367Cab
2014Peterbilt367Cab
2013Peterbilt367Cab
2012Peterbilt367Cab
2011Peterbilt367Cab
2010Peterbilt367Cab
2009Peterbilt367Cab
2008Peterbilt367Cab
1996Peterbilt375Cab
1995Peterbilt375Cab
1994Peterbilt375Cab
1993Peterbilt375Cab
1992Peterbilt375Cab
1991Peterbilt375Cab
1990Peterbilt375Cab
1989Peterbilt375Cab
1988Peterbilt375Cab
1987Peterbilt375Cab
1999Peterbilt376Cab
1998Peterbilt376Cab
1997Peterbilt376Cab
1996Peterbilt376Cab
1995Peterbilt376Cab
1994Peterbilt376Cab
1993Peterbilt376Cab
1992Peterbilt376Cab
1991Peterbilt376Cab
1990Peterbilt376Cab
1989Peterbilt376Cab
1988Peterbilt376Cab
2001Peterbilt377Cab
2000Peterbilt377Cab
1999Peterbilt377Cab
1998Peterbilt377Cab
1997Peterbilt377Cab
1996Peterbilt377Cab
1995Peterbilt377Cab
1994Peterbilt377Cab
1993Peterbilt377Cab
1992Peterbilt377Cab
1991Peterbilt377Cab
1990Peterbilt377Cab
1989Peterbilt377Cab
1988Peterbilt377Cab
1987Peterbilt377Cab
2007Peterbilt378Cab
2006Peterbilt378Cab
2005Peterbilt378Cab
2004Peterbilt378Cab
2003Peterbilt378Cab
2002Peterbilt378Cab
2001Peterbilt378Cab
2000Peterbilt378Cab
1999Peterbilt378Cab
1998Peterbilt378Cab
1997Peterbilt378Cab
1996Peterbilt378Cab
1995Peterbilt378Cab
1994Peterbilt378Cab
1993Peterbilt378Cab
1992Peterbilt378Cab
1991Peterbilt378Cab
1990Peterbilt378Cab
2007Peterbilt379Cab
2006Peterbilt379Cab
2005Peterbilt379Cab
2004Peterbilt379Cab
2003Peterbilt379Cab
2002Peterbilt379Cab
2001Peterbilt379Cab
2000Peterbilt379Cab
1999Peterbilt379Cab
1998Peterbilt379Cab
1997Peterbilt379Cab
1996Peterbilt379Cab
1995Peterbilt379Cab
1994Peterbilt379Cab
1993Peterbilt379Cab
1992Peterbilt379Cab
1991Peterbilt379Cab
1990Peterbilt379Cab
1989Peterbilt379Cab
1988Peterbilt379Cab
1987Peterbilt379Cab
1986Peterbilt379Cab
2016Peterbilt386Cab
2015Peterbilt386Cab
2014Peterbilt386Cab
2013Peterbilt386Cab
2012Peterbilt386Cab
2011Peterbilt386Cab
2010Peterbilt386Cab
2009Peterbilt386Cab
2008Peterbilt386Cab
2007Peterbilt386Cab
2006Peterbilt386Cab
2017Peterbilt389Cab
2016Peterbilt389Cab
2015Peterbilt389Cab
2014Peterbilt389Cab
2013Peterbilt389Cab
2012Peterbilt389Cab
2011Peterbilt389Cab
2010Peterbilt389Cab
2009Peterbilt389Cab
2008Peterbilt389Cab

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
    66145FactoryCabShock Absorber113.13"9.13"4"EYELET/SLEEVEEYELET/SLEEVE
    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
    2007MackCLCab
    2007Peterbilt357Cab
    2006Peterbilt357Cab
    2005Peterbilt357Cab
    2004Peterbilt357Cab
    2003Peterbilt357Cab
    2002Peterbilt357Cab
    2001Peterbilt357Cab
    2000Peterbilt357Cab
    1999Peterbilt357Cab
    1998Peterbilt357Cab
    1997Peterbilt357Cab
    1996Peterbilt357Cab
    1995Peterbilt357Cab
    1994Peterbilt357Cab
    1993Peterbilt357Cab
    1992Peterbilt357Cab
    1991Peterbilt357Cab
    1990Peterbilt357Cab
    2018Peterbilt367Cab
    2017Peterbilt367Cab
    2016Peterbilt367Cab
    2015Peterbilt367Cab
    2014Peterbilt367Cab
    2013Peterbilt367Cab
    2012Peterbilt367Cab
    2011Peterbilt367Cab
    2010Peterbilt367Cab
    2009Peterbilt367Cab
    2008Peterbilt367Cab
    1996Peterbilt375Cab
    1995Peterbilt375Cab
    1994Peterbilt375Cab
    1993Peterbilt375Cab
    1992Peterbilt375Cab
    1991Peterbilt375Cab
    1990Peterbilt375Cab
    1989Peterbilt375Cab
    1988Peterbilt375Cab
    1987Peterbilt375Cab
    1999Peterbilt376Cab
    1998Peterbilt376Cab
    1997Peterbilt376Cab
    1996Peterbilt376Cab
    1995Peterbilt376Cab
    1994Peterbilt376Cab
    1993Peterbilt376Cab
    1992Peterbilt376Cab
    1991Peterbilt376Cab
    1990Peterbilt376Cab
    1989Peterbilt376Cab
    1988Peterbilt376Cab
    2001Peterbilt377Cab
    2000Peterbilt377Cab
    1999Peterbilt377Cab
    1998Peterbilt377Cab
    1997Peterbilt377Cab
    1996Peterbilt377Cab
    1995Peterbilt377Cab
    1994Peterbilt377Cab
    1993Peterbilt377Cab
    1992Peterbilt377Cab
    1991Peterbilt377Cab
    1990Peterbilt377Cab
    1989Peterbilt377Cab
    1988Peterbilt377Cab
    1987Peterbilt377Cab
    2007Peterbilt378Cab
    2006Peterbilt378Cab
    2005Peterbilt378Cab
    2004Peterbilt378Cab
    2003Peterbilt378Cab
    2002Peterbilt378Cab
    2001Peterbilt378Cab
    2000Peterbilt378Cab
    1999Peterbilt378Cab
    1998Peterbilt378Cab
    1997Peterbilt378Cab
    1996Peterbilt378Cab
    1995Peterbilt378Cab
    1994Peterbilt378Cab
    1993Peterbilt378Cab
    1992Peterbilt378Cab
    1991Peterbilt378Cab
    1990Peterbilt378Cab
    2007Peterbilt379Cab
    2006Peterbilt379Cab
    2005Peterbilt379Cab
    2004Peterbilt379Cab
    2003Peterbilt379Cab
    2002Peterbilt379Cab
    2001Peterbilt379Cab
    2000Peterbilt379Cab
    1999Peterbilt379Cab
    1998Peterbilt379Cab
    1997Peterbilt379Cab
    1996Peterbilt379Cab
    1995Peterbilt379Cab
    1994Peterbilt379Cab
    1993Peterbilt379Cab
    1992Peterbilt379Cab
    1991Peterbilt379Cab
    1990Peterbilt379Cab
    1989Peterbilt379Cab
    1988Peterbilt379Cab
    1987Peterbilt379Cab
    1986Peterbilt379Cab
    2016Peterbilt386Cab
    2015Peterbilt386Cab
    2014Peterbilt386Cab
    2013Peterbilt386Cab
    2012Peterbilt386Cab
    2011Peterbilt386Cab
    2010Peterbilt386Cab
    2009Peterbilt386Cab
    2008Peterbilt386Cab
    2007Peterbilt386Cab
    2006Peterbilt386Cab
    2017Peterbilt389Cab
    2016Peterbilt389Cab
    2015Peterbilt389Cab
    2014Peterbilt389Cab
    2013Peterbilt389Cab
    2012Peterbilt389Cab
    2011Peterbilt389Cab
    2010Peterbilt389Cab
    2009Peterbilt389Cab
    2008Peterbilt389Cab
    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.