Meritor MD2014X-390 Differential

Meritor MD2014X-390
MD2014X390GTP

The Meritor MD2014X-390 is a high-performance rear drive axle differential designed for use in heavy-duty Class 7 and 8 trucks. Built for durability, efficiency, and long service life, this model is part of Meritor’s trusted MD (Medium-Duty) axle series, which has become a standard in the commercial trucking industry for applications that require strength under load and low maintenance over time.

This differential is engineered to meet the demands of long-haul, regional, and vocational truck operations, offering dependable performance in challenging driving conditions. Its modular design also allows for simplified service and part replacement.

Key Features

• Type: Tandem Rear Drive Axle Differential
• Application: Heavy-duty trucks (Class 7 & 8), including Freightliner, Kenworth, International, Peterbilt, and Volvo trucks
• Mounting: Standard housing and differential mounting compatible with most OEM configurations
• Differential Style: Conventional (non-locking), with hypoid gear set
• Axle Housing: 2014X series tandem rear axle

Technical Specifications:

• Axle Type: Tandem Drive (Rear)
• Axle Capacity: 40,000 lbs (20,000 lbs per axle)
• Gear Ratio: 2.47:1
• Differential Type: Standard / Open Differential
• Suspension Compatibility: Air Ride, Leaf Spring, and others
• Carrier Assembly: Top-mounted, standard Meritor design
• Input Spline Count: Varies (commonly 39 or 41 splines)
• Lubrication: Oil-lubricated (85W-140 recommended)
• Brake Compatibility: Typically 16.5″ S-cam drum or disc
• OEM Cross Reference: Compatible with various OE part numbers (verify with VIN)

Applications

• Long-haul freight trucks
• Regional delivery vehicles
• Construction and vocational trucks
• Refuse and municipal fleets
• Trucks requiring high-torque and high-speed balance