Skip to product information
1 of 3


Fortpro Trunnion & Bushing Assembly for Mack 4" Spring - Replaces 39QK326

Fortpro Trunnion & Bushing Assembly for Mack 4" Spring - Replaces 39QK326

SKU: F174004

Availability: In Stock

Stock Level: More than 50 available.

Shipping: Calculated at Checkout

Regular price $215.81 USD
Regular price Sale price $215.81 USD
Sale Sold out
Shipping calculated at checkout.

About this Item

  • Very Important: Please Verify this product Description and Compatibility before Buying
  • Compatible with Mack SS34-38, 4inch. SPRING SS44, SWS573 Camelback Rear Suspension Series
  • Built on High Strength Materials to ensure long term reliability
  • Exceeds OEM quality standards
  • Replacement for Mack 39QK27E, 39QK326, 25130237 Trunnion & Bushing Assembly


Experience a superior ride with the Fortpro Trunnion and Bushing Assembly, meticulously crafted for compatibility with Mack 4-inch SPRING SS34-38, SS44, SWS573 Camelback Rear Suspension Series. This all-in-one assembly, a seamless replacement for OEM parts 39QK27E, 39QK326, and 25130237, ensures precision and durability in critical suspension components. The trunnion and bushing combination delivers enhanced stability, reduced friction, and optimal performance, contributing to an overall smoother ride. Trust in Fortpro's commitment to quality engineering and materials that stand up to the demands of heavy-duty use. Elevate your Mack truck's suspension system with the Fortpro Trunnion and Bushing Assembly and experience the difference on every journey.


  • Brand: Fortpro
  • Vehicle Type: Semi-Trucks / Heavy Trucks
  • Product Department: Suspension
  • Product category : Rear Suspension
  • Part Type : Trunnion & Bushing Assembly
  • OEM Reference #: 39QK326
  • Width: 4.00 in.
  • Length: 7 1/2 in.
  • Inside Diameter (ID): 3 1/2 in.
  • Hole Distancing: 5 1/4 in.
  • Holes Diameter: 1 5/16 in.
  • Thread Size: 5/16 in. x 24 UNF
  • Applications:
    Mack Rear Suspension 4 in. Spring SS34-38
    Mack Rear Suspension 4 in. Spring SS44SWS573
    Mack 44,000 Camel Back Suspension

BOM (Bill of Materials):

  • Trunnion OEM Reference: 39QK27E pcs x 1
  • Bushing OEM Reference: 10QK157 pcs x 1


  • Automann: M1116
  • Dayton Parts: 338-702
  • Euclid: E-3687
  • Mack: 39QK27E, 39QK326, 25130237
  • Meritor: R303687
  • PAI: EM47550

Shipping Policy

In order to send your purchase, our company may use different freight companies like USPS, UPS and some 3erd Carrier Services for Oversize orders, this will not affect the final price of your order. We will send you all the information in due time. 

For Free Shipping and Freight/Oversize Shipments they are some special term you may check at our Terms & Conditions page.


Return Policy

If for any reason you need to return a purchased item, we have a 30-day return policy, which means you have 30 days after receiving your item to request a return.

To be eligible for a return, your item must met the conditions stablished in our Terms & Conditions.

To start a return, you can contact us at


Dimension Not Available.
View full details