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FleetPride Londonderry Service CenterLondonderry, NH 0305348 mi · 63 min
Light-DutyMedium-Duty (Cl. 3–6)Heavy-Duty (Cl. 7–8)
Specializations: Driveshaft Repair & Balancing · Heavy-Duty Drive Axle Service
Commercial & fleet
Heavy-duty truck drivetrain repair
Class 7–8 drive axles, tandem axles, power dividers and wheel ends need different bays, lifting equipment and parts than passenger vehicles. Find shops that report heavy-duty capability.
Manufacturer specifications apply. This page explains concepts only. Torque values, clearances, preload, backlash ranges and procedures vary by axle model and must come from the vehicle or component manufacturer's service information. This directory does not publish repair specifications.
GVWR classes used in this directory
Gross vehicle weight rating classes as used by the U.S. Federal Highway Administration.
| Class | GVWR | Duty |
|---|---|---|
| Class 1 | Up to 6,000 lb | Light |
| Class 2 | 6,001–10,000 lb | Light |
| Class 3 | 10,001–14,000 lb | Medium |
| Class 4 | 14,001–16,000 lb | Medium |
| Class 5 | 16,001–19,500 lb | Medium |
| Class 6 | 19,501–26,000 lb | Medium |
| Class 7 | 26,001–33,000 lb | Heavy |
| Class 8 | 33,001 lb and over | Heavy |
Tandem drive axle
Two driven rear axles on a heavy truck, the forward-rear and rear-rear axles, which share the load and the driving torque. Common on Class 8 tractors, dump trucks and vocational trucks.
Inter-axle differential
A differential, usually built into the forward-rear axle of a tandem, that splits torque between the two drive axles and lets them turn at slightly different speeds. Many designs include a driver-controlled lock for low-traction conditions.
Power divider
Common shop term for the inter-axle differential assembly on a tandem drive axle. Power divider wear or damage is a frequent tandem-axle repair.
Wheel-end bearing
The bearings that support the hub on the axle spindle. Heavy trucks commonly use tapered roller bearings, either adjusted using a specified procedure or supplied as pre-set or unitized assemblies. Adjustment procedures come from the axle or hub manufacturer.
Hub seal
The seal at the inboard side of the hub that keeps oil or grease in and keeps water and dirt out. A leaking hub seal can contaminate brakes and lead to bearing failure.
Shops listing heavy-duty service
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