Monroe 65400 Gas Magnum Shock Absorber – Peterbilt Kenworth Mack

Monroe 65400 Gas Magnum 65 is a nitrogen gas-charged heavy-duty shock absorber for Class 6–8 air-spring and taper-leaf suspensions, replacing Peterbilt 307423 / 306084, Mack 650400, Volvo 3919946, and Gabriel 85033 / 89427. The shock uses a 1-3/4 in bore with a 2-3/8 in reserve tube and 10-stage valving tuned for heavy-truck damping, with 17.375 in compressed / 26.750 in extended length and a 9.375 in stroke.

Signs You Need New Shock Absorbers

• Excessive bouncing or floating sensation over bumps
• Nose diving during braking or squatting during acceleration
• Uneven or cupped tire wear patterns
• Vehicle swaying or poor handling in crosswinds
• Oil leaking from shock body or seals
• Visible damage to shock body, bushings, or mounts
• Increased stopping distance

Specifications

Cross References

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

• Peterbilt: 307423, 306084, 305384, 305106, 665633, 03-07423, 03-06084, 03-05384
• Kenworth: 0306085PLUS, 03-0742
• Paccar: 665633, 307423, 306084
• Mack: 650400
• Volvo / White / GMC: 3919946, SA5033
• International / Navistar: AMS650400
• Gabriel: 85033, 89427
• Meritor: M85033, M89427
• KYB: 341620, 341621
• Sachs: 315549
• Neway: 57365400
• Monroe (Alternate): 650400
• Haldex: SA65400
• Fleetrite: AMS650400
• Alliance: ABP N32 G900039, ABP N32 O900039
• Bulldog: HD1215-0037, HD1215-003, HD1214-0612
• Dayton Parts: 441-85033, M65400
• FCS: F346598, F346599, F343368, F344355, F344353
• NAPA: 65400
• Automann: A85033

Applications

This shock fits the rear suspension of the following heavy-duty trucks:

• Peterbilt 357 (1990–2008)
• Peterbilt 362 (1981–2006)
• Peterbilt 372 (1989–1997)
• Peterbilt 375 (1987–1996)
• Peterbilt 376 (1988–1999)
• Peterbilt 377 (1987–2001)
• Peterbilt 378 (1988–2007)
• Peterbilt 379 (1986–2007)
• Peterbilt 330 / 384 / 385 / 386 / 387 / 587 (select years with compatible suspension)
• Kenworth — select models with compatible Paccar suspension
• Mack — select models with compatible suspension
• Volvo / White / GMC — select heavy-duty models
• International / Navistar — select models

Verify your suspension type and vehicle specifications before ordering. Some applications may require different Monroe part numbers depending on suspension configuration (Neway, FlexAir, Air Trac, Haulmaax, etc.).

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. This does not apply to UPS Ground Saver or Economy shipments (see below).

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

UPS Ground Saver and Economy Shipping
UPS Ground Saver and Economy are our lowest-cost shipping options, but they don't include claim support. If a package sent with one of these services is lost or arrives damaged, we can't file a claim or help resolve it. Choose UPS Ground or faster if you want that protection.

Returns
All Pro Truck Parts offers lifetime returns for any reason on NEW, UNOPENED items in the original packaging, with exceptions (see restocking fee, excluded categories, used items, sale items and special order items below).
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.

Restocking fee and return shipping
Returns of new, unopened items are subject to a 20% restocking fee, which is deducted from your refund. You pay the shipping to send the item back, and shipping costs are not refunded.

Excluded categories
Engines cannot be returned. If one is defective, see defective parts (warranty) below.

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 parts (warranty)
A part that fails is handled through the manufacturer's warranty process, not as a return. The manufacturer reviews the claim and decides whether the part is defective for the application it was purchased for. If you need a part right away, you will need to purchase a replacement rather than wait on the warranty review. Start a warranty claim at help.allprotruckparts.com.

Sale items (if applicable)
Only regular priced items may be refunded. 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.

How to start a return
Start your return online at help.allprotruckparts.com/returns with your email or phone number and order number. Questions? Text us at (903) 527-5854 or email sales@allprotruckparts.com.
Ship your return to: All Pro Truck Parts, 3948 Interstate 30 W, Caddo Mills TX 75135, United States.
You are responsible for paying the shipping costs to return your item. Shipping costs are non-refundable. If you are shipping an item over $75, we advise using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.

Refunds
Once your returned item is received and inspected, we will send you an email to let you know we received it and whether your refund is approved.
If approved, your refund will be processed and credited to your credit card or original method of payment within 7 business days. For orders paid on our card terminal, text or email us to start the refund.

"Free Shipping" orders
If we paid the shipping on your order ("Free Shipping"), the cost of shipping it to you will be deducted from your refund when the item is returned and inspected.

Exchanges
We only replace items if they are defective or damaged. If you need to exchange it for the same item, start it at help.allprotruckparts.com/returns or text or email us, and send your item to the return address above.

Read our full return policy.