TOMS OFFROAD Differential and Traction Device Basics

Applications:

• Dana 30: 3429 (4-Series) (3-series option)
• Dana 44: 3428 (4-Series) (3-series option)
• Ford 9”: 2978 (28 Spline), 2979 (31 Spline), 2979B (35 Spline)

Description:

The PowerTrax Grip Pro is a clutchless, gear-driven limited slip carrier, similar to the Detroit True Trac. Ideal for higher torque builds and larger tires. Requires only standard 80-90W gear oil, no additive.

Takeaways:

• Great on/offroad performance
• Not overly aggressive – similar to factory limited slip
• Gear-driven (heavier duty than clutch units)

Applications:

• Dana 44: 3420 (3-Series), 3422 (4-Series)

Description:

A standard-duty clutch-style limited slip similar to factory Trac-Lok. Requires additive with gear oil. Not recommended for builds with high horsepower or tires larger than 35".

Takeaways:

• Good on/offroad performance
• Clutch-driven – not ideal for high horsepower/large tires
• Friction modifier required

Applications:

• Ford 9”: 2975 (28 Spline), 2977 (31 Spline)
• Dana 44: Not stocked

Description:

Factory-style clutch-driven limited slip. Great budget replacement with standard duty performance. Requires friction modifier. Not ideal for large tires or high horsepower.

Takeaways:

• Good onroad and light offroad use
• Clutch-driven = lower durability
• Friction modifier required

Applications:

• Ford 9”: 2970 (28 Spline)

Description:

Gear-driven limited slip offering superior strength and reliability. Ideal for higher performance builds. No friction modifier required.

Takeaways:

• Excellent on/offroad performance
• Gear-driven = stronger, no clutches
• No additive required

Applications:

• Dana 44: 2991A (Air Locker, 4-Series), K2991B (Cable Locker, 4-Series)

Description:

Heavy-duty selectable locker actuated by air or cable. Locking mechanism built into differential cover for easier repair. No friction modifier needed.

Takeaways:

• 100% lockup when engaged
• Selectable via button or cable
• Very strong and offroad-focused

Applications:

• Dana 44: 3442Z (Air Locker, 4-Series)

Description:

Air-actuated selectable locker. Direct competitor to ARB and Ox Locker. Great for mixed on/offroad use. No additive needed.

Takeaways:

• 100% lockup when activated
• Air powered
• Better price point than ARB

Applications:

• Dana 44: 3440 (3-Series), 3442 (4-Series)
• Ford 9”: 2982 (31 Spline), 2982B (35 Spline)

Description:

Premium air-actuated locker. Known for durability and performance. Excellent for aggressive offroading. No additive required.

Takeaways:

• 100% lockup when engaged
• Air compressor required
• Great offroad performance and onroad drivability when disengaged

Applications:

• Dana 44: 3434 (4-Series)
• Ford 9”: 2968 (28 Spline), 2969 (31 & 35 Spline)

Description:

Automatic full locker for hardcore offroad use. Locked under throttle, unlocks during coast. Not recommended for primarily onroad Broncos due to aggressive behavior.

Takeaways:

• 100% lock under acceleration
• Not ideal for pavement driving
• Great for serious offroading