Neon SRT-4 Gatz 4.08 Billet Final Drive

The Only Billet Final Drive Available. Built for 800+ WHP Liberty Drag Cars.

If you're building a serious SRT-4 with a Liberty dogbox and 4-digit power goals, this is not optional.

This is the only billet final drive available for the platform.

The only alternative is the OEM cast gear — and at extreme horsepower levels, it becomes a liability.

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The OEM Problem

At 800–1300+ whp, especially in Liberty dogbox applications, the factory final drive is a known weak link.

When OEM strips:

• It sends metal through the transmission
• It damages expensive Liberty gearsets
• It cracks or destroys transmission casings
• It often damages the clutch assembly
• It turns a single gear failure into a catastrophic rebuild

A stripped final drive does not fail alone.
It takes everything with it.

If you're investing in a Liberty dogbox, running OEM final drive at extreme power is gambling the entire setup.

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The Only Billet Solution on the Market

There is no competing billet alternative.

This is the only billet final drive currently available for the Neon SRT-4 platform.

Precision manufactured by Gatz, this system includes:

• Billet 4.08 ring gear
• Billet output shaft
• Designed specifically for high horsepower drag applications

This is not a modified OEM gear.

It is a structural upgrade.

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Engineered for Liberty Dogbox Gear Ratios

This 4.08 ratio was selected to match Liberty dogbox gear stacks in extreme XFWD applications.

At 9,000–10,000 RPM:

• Gear spacing remains aggressive
• Boost stays in the powerband
• RPM drop between shifts is optimized
• Acceleration is maximized without sacrificing trap speed

This is not a random ratio.

It was engineered to work with Liberty transmissions at extreme power.

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Optimized for 10,000 RPM & 180+ MPH XFWD Builds

With proper tire setup and Liberty gearing, the 4.08 allows:

✔ Full utilization of a 10,000 RPM powerband
✔ 180+ mph capability
✔ Aggressive torque multiplication off the line
✔ Improved 60ft and early track acceleration

This is a drag-focused ratio.

Not a cruising ratio.

Not a daily driver ratio.

A race ratio.

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Performance Impact vs Stock 3.53

The factory SRT-4 final drive is 3.53.

The 4.08 increases torque multiplication at the wheels by approximately 15%.

That translates into:

• Harder launch
• Faster gear acceleration
• More violent mid-track pull
• Better ability to stay in boost

Comparison

At extreme power, that difference is not small.

It is decisive.

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Built for 800+ WHP Competition Builds

While it can physically operate in sub-800whp cars, this final drive was engineered specifically for:

✔ 800+ whp builds
✔ Liberty dogbox transmissions
✔ XFWD drag applications
✔ 9–8 second quarter mile goals
✔ High RPM (9,000–10,000+) engines

If you are under 700-800whp, OEM may survive.

If you are over 900-1000whp, OEM becomes a gamble.

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Real World Testing

This final drive was run for over 2 years on our drag car.

8.8s ET.
178 mph best trap speed.
Repeated 1.4x 60ft launches.

All while maintaining structural integrity.

Track proven.
Not theory.

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BulletProof Upgrade Option (+$650)

For serious 900–1300+ whp builds, we strongly recommend selecting the BulletProof option.

With this service we:

• Reassemble everything with proper clearances and turning torque

Extreme power requires proper setup.

Freight for transmission handling is additional and billed at return shipping.

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Production & Lead Time

These are made to order.

Typical lead time: 2–4 months.

This is not a mass-produced gear.

Machining time and precision manufacturing require scheduling.

Serious builders plan ahead.

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This Is Not for Everyone

If your car is:

• Mild power
• Street focused
• Weekend cruiser

This is not necessary.

If your build includes:

• Liberty dogbox
• 800–1300+ whp
• 10,000 RPM powerband
• 180+ mph goals

This is the only billet option available.

There is no alternative.

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Protect the Investment

A Liberty dogbox transmission represents thousands of dollars.

Running it behind a cast OEM final drive at extreme power is a known failure point.

This billet 4.08 eliminates that weak link.

At this level, this is no longer an upgrade.

It is insurance.

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The Only Billet Final Drive for the Platform.

Built for racers who refuse to gamble their transmission.