Monroe 65139 Gas-Magnum 65 Shock Absorber – Freightliner Century Classic Columbia

The Monroe 65139 is a premium Gas-Magnum 65 shock absorber engineered for Class 6-8 heavy-duty Freightliner trucks. As the first gas-charged, large-bore shock specifically designed for air spring and taper leaf suspensions, the Gas-Magnum 65 delivers the fast response and consistent damping control essential for today's commercial truck suspension systems. The nitrogen gas charge reduces aeration and shock fade while the extra-large 1-3/4" bore handles the demands of high mileage and severe service applications.

Signs You Need a New Shock Absorber

• Excessive bouncing or nose-diving during braking
• Poor handling and reduced steering response
• Uneven or cupped tire wear patterns
• Visible oil leaking from the shock body
• Harsh ride quality or bottoming out over bumps
• Increased stopping distance

Specifications

Cross References

This part replaces or is equivalent to the following part numbers:

• Freightliner: 1012703000, 1012704000, 1013021000, 1013063000, 1013211000, 1013634000, 1618455000, 471700002726
• Gabriel: 85918, 89449
• Meritor: M85918, M89449
• Volvo/White/GMC: SA5918, RCSA5918
• Sachs: 311229, 315390, 315601, 315617, 315623, 410026, 471700003920
• Haldex: SA65139
• Automann: A85918
• Road Choice: SA5918
• Power10 Parts: SSA-85918, SSA-89449
• Bulldog HD: HD1215-0024
• KYB: 341615, 341618
• NAPA: 65139
• FCS: F347225, F347261
• Gold Shock: 8180135, 8180171, 9180143
• Alliance: ABPN32O900003, ABPN32O900077

Applications

This shock absorber fits the following Freightliner trucks:

• Freightliner Century Class 112/120: 1996-2010
• Freightliner Classic 120: 1990-2010
• Freightliner Classic XL 132: 1990-2010
• Freightliner Columbia 112/120: 2001-2010
• Freightliner Coronado 132: 2003-2014
• Freightliner Coronado (New Style): 2010-2016
• Freightliner FLC112: 1985-2001
• Freightliner FLD112: 1991-2007
• Freightliner FLD120: 1988-2011
• Freightliner FLC120: 1981-1991
• Freightliner Argosy: 1999-2015

Also fits the following trucks:

• Sterling Truck AT9513: 1999-2001
• Thomas Built Buses: Various models

Gas-Magnum 65 Features

• Nitrogen Gas Charge: Reduces aeration and foaming for consistent damping control, maintains tire-to-road contact for improved handling
• 10-Stage Valving: Vehicle-specific tuning adjusts to road extremes for a smooth, controlled ride
• Large 1-3/4" Bore: Handles the demands of high mileage and severe service applications
• All-Weather Fluid: Special additives assist with extreme temperatures and reduce oil breakdown
• 360° Arc Welds: Provides superior durability and structural integrity
• Shouldered/Bonded Bushings: Prevents bushing walkout for improved quality and longevity
• 2-3/8" Reserve Tube: Holds more fluid for improved performance

Note: Sold individually. Replace shocks in pairs for balanced handling and consistent ride quality. Verify your suspension type (tapered leaf, flat leaf, or air spring) and front axle weight rating before ordering to confirm fitment. Measure center of bushing eye to center of bushing eye for accurate length comparison. Monroe 65139 and 65148 are similar shocks with minor dimensional differences—verify extended and compressed lengths match your application.

Handling Time
At All Pro Truck Parts we do our best to ship all orders the same day for orders placed before 12:00 PM Central Standard Time. Same-day shipment is never guaranteed. For standard UPS shipping, you will typically receive your package in 1 - 5 business days. Shipping times are never guaranteed and All Pro Truck Parts is not responsible for lost or delayed shipments by the carrier. Carrier times vary by distance from shipment origin and may change without prior notice. Shipping price is calculated from package dimensions and weight. Calculated rates for orders will be available at checkout. Orders placed after 12:00 PM CST on Fridays will not be fulfilled until the following business day, Monday morning barring a holiday.

Next Day Air Shipments
The cutoff time for UPS Next Day Air is 12:00 PM CST. Orders for Next Day Air placed after 12:00 PM CST will ship the following business day.

Incorrect Shipping Prices
All Pro Truck Parts reserves the right to cancel any order in the event shipping rates are calculated incorrectly at checkout. We will notify you at your provided contact information to give you the option to pay the correct amount, or allow you to cancel the order for a full refund.

Shipping Destinations
All Pro Truck Parts ships within the United States only. We do not currently offer international shipping.

Damaged Shipments
All Pro Truck Parts is not responsible for damage that occurs in transit - responsibility for damaged shipments lies with the carrier. However, we are glad to assist by filing a claim with the carrier on your behalf.

If your package arrives damaged, please do the following:

1. Refuse delivery if the package is visibly damaged at the time of arrival, and note the damage with the driver.
2. If the damage is discovered after delivery, photograph the outer packaging BEFORE opening the box, then photograph the contents showing the damage.
3. Keep all original packaging, including boxes, packing materials, and labels. Carriers may require an inspection before approving a claim.
4. Notify us within 48 hours of delivery by submitting a damaged shipment report at help.allprotruckparts.com/damaged-shipment.

Once a claim has been filed, resolution is determined by the carrier. Refunds and replacements for damaged shipments will only be issued after the carrier approves the claim. Failure to report damage within 48 hours, discarding the original packaging, or opening a visibly damaged package without photographing it first may result in the carrier denying the claim, in which case we are unable to refund or replace the item.

Shipping Services

• UPS Shipping Services
• UPS Ground
• UPS 2nd Day Air A.M. (commercial addresses only)
• UPS 2nd Day Air
• UPS 3 Day Select
• UPS Next Day Air Saver
• UPS Next Day Air
• UPS Next Day Air Early

Returns
All Pro Truck Parts offers lifetime returns for any reason on NEW, UNOPENED items in the original packaging with exceptions. (See sale items and special order items).
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

Used items (if applicable)
Items marked as USED at the time of sale will be accepted for return up to 30 days from the date of sale. 

Defective items (if applicable)
Defective items under manufacturer warranty will be eligible for return, as well as a full refund for the total amount paid by the customer. The following criteria must be met to be eligible. (a). The part is under manufacturer warranty (b). the manufacturer has determined the part defective for the purchased application. 

Refunds (if applicable)
Once your item is returned and received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 7 business days. For order placed by phone through a card terminal, you must call in to initiate the refund. 

Late or missing refunds (if applicable)
If you haven’t received a refund yet, first check your bank account again.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at sales@allprotruckparts.com.

Sale items (if applicable)
Only regular priced items may be refunded, unfortunately sale items cannot be refunded. 

Special Order Items (if applicable)
Special order items may be eligible for a refund. The decision to accept a special order item for refund is left solely to the All Pro Truck Parts management team. 

Exchanges (if applicable)
We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at sales@allprotruckparts.com and send your item to: All Pro Truck Parts, 3948 Interstate 30 W, Caddo Mills TX 75135, United States.

Shipping
To return your product, you should mail your product to: All Pro Truck Parts, 3948 Interstate 30 W, Caddo Mills TX 75135, United States

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable.

Depending on where you live, the time it may take for your exchanged product to reach you, may vary.

If you are shipping an item over $75, it is advised that you use a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.
For returned items designated as "Free Shipping", any items shipped to the customer in which the customer did not pay shipping. All Pro Truck Parts will recover the cost of shipping to the customer's address from the refundable amount owed to the customer on the return and inspection of the item.