Freightliner MT45 / MT55 Custom Chassis (walk-in van, legacy)
Walk-in van / step van chassis • Production 1996–2018
About the Freightliner MT45 / MT55 Custom Chassis (walk-in van, legacy)
The Freightliner MT45 / MT55 was Freightliner Custom Chassis Corp's walk-in van platform — the chassis under millions of UPS and FedEx Ground delivery trucks. Production ended 2018 as Daimler exited the walk-in van chassis market, but the MT45/MT55 with the iconic 'P-truck' UPS body remains the most-recognizable delivery truck in America. Used MT45/MT55 chassis are in continuous service across all major parcel and bakery delivery fleets.
Overview
The Freightliner MT45 / MT55 was Freightliner Custom Chassis Corp's walk-in van platform — the chassis under millions of UPS and FedEx Ground delivery trucks. Production ended 2018 as Daimler exited the walk-in van chassis market, but the MT45/MT55 with the iconic 'P-truck' UPS body remains the most-recognizable delivery truck in America. Used MT45/MT55 chassis are in continuous service across all major parcel and bakery delivery fleets.
Specifications
- Manufacturer
- Freightliner
- Class
- Class 4-6
- Vehicle type
- Walk-in van / step van chassis
- Cab type
- Walk-in (driver stands)
- Production years
- 1996–2018
- Applications
- Parcel delivery (UPS, FedEx), bread/bakery delivery, mobile service
- Typical engines
- Cummins B6.7, Mercedes MBE900 (legacy)
- Typical transmissions
- Allison 2200/2500 automatic
- GVWR range
- 16,000-26,000 lb
Design and engineering
Walk-in chassis — driver stands and walks through the cab to enter the body. Sliding cab door. Steep windshield rake. Cummins B6.7 dominated late-production years; early units used Mercedes MBE900. Allison automatic standard. Body builders (Utilimaster, Morgan Olson, Grumman) installed the actual delivery body on top.
Generations and major changes
Market position and popularity
Millions of MT45/MT55 chassis are still in service — UPS alone runs 100,000+ P-trucks. Used market is enormous. Production ended 2018 — UPS, FedEx, and other major fleets now mostly use Workhorse, Utilimaster, Mack, or international alternatives for new orders.
Who buys this truck
UPS, FedEx Ground, bread/bakery distribution (Bimbo Bakeries, Flowers Foods), mobile service, last-mile delivery.
Common problems and reliability notes
Cummins B6.7 emissions at 250K+ miles (typical urban delivery use stresses DPF in stop-and-go). Body-to-chassis corrosion at junction points. Sliding cab door track wear from frequent open/close cycles.
Pros and cons
✓ Pros
- • Iconic walk-in design — proven
- • Massive parts ecosystem
- • Cummins B6.7 reliability
- • Strong resale
⚠ Cons
- • Production ended 2018
- • No new MT45/MT55 units
- • Walk-in design quirks (sliding door, steep windshield)