This document is the Meritor Component Reference Guide (TP-7824), which details technical specifications and model nomenclature for Meritor truck and tractor axles, transfer cases, and drivelines. All capacity ratings and applications are subject to engineering approval, and non-approved uses may void warranties.

1. Axle Specifications and Ratings

The guide categorizes axles by type, reduction method, and load capacity:

Front Non-Drive Steer Axles: Ratings range from 6,000 lbs (2,724 kg) to 20,000 lbs (9,080 kg).
Front Drive Steer Axles: Models such as the MX-10-120 and MX-23-160 support ratings from 10,000 lbs up to 23,000 lbs.
Single Rear Axles: Includes Hypoid Single-Reduction, Two-Speed, and Double-Reduction models with ratings up to 38,000 lbs.
Tandem and Tridem Axles: Tandem sets are rated up to 70,000 lbs, while Tridem Drive Axle sets (RZ series) reach capacities of 77,000 lbs.

2. Transfer Case Models

The manual covers both single-speed and two-speed transfer cases:

Single-Speed: Models like the T-2119 (3-shaft design) have a maximum torque rating of 20,300 lb-ft.
Two-Speed: Models include the MTC-4210/4213 (4-shaft) and TG-2213RD (2-shaft), offering high/low ratios and optional features like Power Take-Off (PTO) and lubrication pumps .

3. Model Nomenclature

The guide provide charts to decode axle and transfer case model numbers:

New Front Non-Drive Axles: Decoded by GAWR, beam/kingpin variation, and brake attachment (e.g., MFS-12-122A-NL-1).
Drive Axles: Decoded by axle type, gearing size, housing wall thickness, manufacturing location, and brake type (e.g., MS-21-145-DB-BNQ-123-355).
Brake Types: Represented by letter codes, such as C for Air Disc Brakes, Q for “Q” Series Cam Brakes, and W for “W” Series Cam Brakes.

4. Driveline Guidelines

Linehaul driveline mainshaft sizing is provided for RN Series (greaseable) and RPL Series (Permalube) drivelines based on engine horsepower and a “Driveline Index” calculated from Gross Combination Weight (GCW), static loaded tire radius, and axle ratio.