Freightliner MT45 / MT55 (Custom Chassis)

FreightlinerClass 5–7

Freightliner MT45 / MT55 (Custom Chassis)

The chassis under America's parcel and bread-truck fleets.

The Freightliner Custom Chassis MT45/MT55 walk-in van chassis is the backbone of parcel and route-delivery fleets — bodied by the likes of Morgan Olson — and is offered in diesel, gasoline, and an MT50e battery-electric variant.

Maker

Daimler Truck North America

Years

1995–present

Body

Medium-Duty

Rating

14,140–30,000 lb GVWR

Power

Up to ~300 hp

Applications

Walk-in delivery, Parcel, Food & beverage, Utility

Engines

Cummins ISB/B6.7GM 6.6L V8 gasoline

Trouble with your MT45 / MT55 (Custom Chassis)?

Describe the symptom and Mike — the free AI truck consultant — will help you figure out what's wrong, which part is involved, and whether it's safe to drive. Free, no account.

Common replacement parts

Real products from the PartsNow catalog. Confirm fitment with Mike before ordering.

3030HNTRX - 3030 SPEC LONG SHAFT HNTRX BRAKE CHAMBER

3030HNTRX

3030HNTRX - 3030 SPEC LONG SHAFT HNTRX BRAKE CHAMBER

OTR10143 - AUTO SLACK ADJUSTER, 11/2-10DRIVE 5.5,6.5

OTR10143

OTR10143 - AUTO SLACK ADJUSTER, 11/2-10DRIVE 5.5,6.5

5-808330 - BRAKE KIT FOR 4709DEN SHOES

5-808330

5-808330 - BRAKE KIT FOR 4709DEN SHOES

370036A - OIL BATH SEAL

370036A

370036A - OIL BATH SEAL

348-4195 - HUB CAP (SENTINAL LARGE DIAM)

348-4195

348-4195 - HUB CAP (SENTINAL LARGE DIAM)

5008414PGBXW - AIR DRYER CARTRIDGE, PURAGUARD

5008414PGBXW

5008414PGBXW - AIR DRYER CARTRIDGE, PURAGUARD

11444 - GLADHAND BRACKET MOUNT

11444

11444 - GLADHAND BRACKET MOUNT

15W40 OIL - 15W40 OIL (ROTELLA) GAL JUG

15W40 OIL

15W40 OIL - 15W40 OIL (ROTELLA) GAL JUG

Brakes & Wheel End Air System Filtration Electrical & Lighting Suspension & Steering Cooling System Drivetrain Body & Cab Exhaust

Find parts at PartsNow.ai Call or text (865) 290-5485

Guides from the shop

Brakes & Wheel End

Grease vs. Oil-Bath Hubs: Picking the Right Wheel End Lube

Grease vs oil-bath wheel end lube compared: intervals, seal compatibility, and failure signs to help you pick right for your fleet.

Electrical & Lighting

Trailer ABS Light Won't Go Off? Sensor & Wiring Guide

Trailer ABS light staying on? Step-by-step diagnosis for wheel speed sensors, harness corrosion, and ECU faults before you swap parts.

Aftertreatment & Emissions

DEF Lines Freezing? Winter Prevention & Fixes for Fleets

Stop DEF freezing from parking your trucks. Learn heated-line checks, tank insulation, and SCR fault codes before derates hit.

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