Differential
A differential is a crucial part of a vehicle that helps wheels turn at different speeds when a car goes around corners. Think of it like a smart gearbox that sits between the driven wheels (usually the rear or front wheels) and helps distribute power from the engine. Without it, cars would have trouble turning smoothly and could damage their tires. Auto repair professionals often need to diagnose, repair, or replace differentials as part of their work. You might see this mentioned as "diff" for short, or specified as "rear differential" or "front differential" depending on the vehicle type.
Examples in Resumes
Specialized in Differential repairs and maintenance for luxury vehicles
Performed complete Differential rebuilds on heavy-duty trucks
Diagnosed and repaired Diff problems on various 4x4 vehicles
Typical job title: "Differential Specialists"
Also try searching for:
Where to Find Differential Specialists
Professional Organizations
Online Communities
Job Resources
Example Interview Questions
Senior Level Questions
Q: How would you diagnose and repair a limited-slip differential that's making noise?
Expected Answer: A senior technician should explain the step-by-step diagnostic process, including test driving, checking fluid conditions, and inspecting internal components. They should also discuss the differences between various limited-slip differential designs and common failure points.
Q: What experience do you have with rebuilding heavy-duty truck differentials?
Expected Answer: Should demonstrate knowledge of commercial vehicle differential systems, proper tooling requirements, and understanding of gear pattern testing and adjustment procedures.
Mid Level Questions
Q: How do you determine if a differential needs repair versus replacement?
Expected Answer: Should explain evaluation criteria including mileage, type of damage, cost comparison between repair and replacement, and availability of parts.
Q: What are the signs of a failing differential?
Expected Answer: Should list common symptoms like whining noises, vibrations, fluid leaks, and grinding sounds, and explain how these relate to specific problems.
Junior Level Questions
Q: What types of differential fluid do you use and why?
Expected Answer: Should know basic differential fluid types, when to use specific viscosities, and the importance of using manufacturer-recommended fluids.
Q: How often should differential fluid be changed?
Expected Answer: Should be able to explain basic maintenance intervals, factors that affect fluid life, and signs that fluid needs changing.
Experience Level Indicators
Junior (0-2 years)
- Basic differential fluid changes
- Simple seal replacements
- Basic diagnostics
- Understanding of differential operation
Mid (2-5 years)
- Complete differential rebuilds
- Gear set replacements
- Advanced diagnostics
- Limited slip differential service
Senior (5+ years)
- Custom gear ratio setups
- Heavy equipment differential work
- Advanced troubleshooting
- Training and supervising others
Red Flags to Watch For
- No experience with proper diagnostic equipment
- Lack of knowledge about different fluid types
- Unable to read gear patterns
- No understanding of basic differential operation
- Lack of experience with manufacturer specifications
Related Terms
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