Dodge Viper SRT-10 8.4L V10 Engine & 6-Speed Transmission
The pairing of the 8.4L V10 and the Tremec TR-6060 6-speed manual represents the mechanical peak of the Dodge Viper. Introduced in 2008 (Gen IV), this powertrain corrected the “weak links” of the earlier 8.3L models, resulting in a drivetrain capable of handling massive torque with track-ready reliability.
Listing Details
- 8.4L V10
- Engine Number *9V500697*
- Removed from 2009 Viper SRT-10
- Aluminum Block & Cylinder Heads
- Silver-Finished Intake Manifold
- Red-Finished Valve Covers
- Ancillary Components
- Tremec 6-Speed Manual Gearbox
The 8.4L V10 Engine (The “Phase 4”)
While the displacement only increased by 0.1L over the previous generation, the internal changes were radical. This engine was co-developed with McLaren Performance Technologies.
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Power Output: 600 hp @ 6,100 rpm and 560 lb-ft of torque @ 5,000 rpm (later bumped to 645 hp in the Gen V).
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Cam-in-Cam VVT: The standout feature. It allows the exhaust valves to be phased independently from the intake, providing a wider torque curve and cleaner emissions without sacrificing the “big cam” lope at idle.
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Dual Electronic Throttle Bodies: Unlike the single or cable-driven setups of the past, the 8.4L uses two independent electronic throttles for more precise air-to-fuel management.
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Improved Oiling: Features a high-flow oil pump and a swinging pickup to prevent oil starvation during high-G cornering—a common issue on earlier 8.0L and 8.3L track builds.
The Tremec TR-6060 6-Speed Transmission
Replacing the aging T-56 in 2008, the TR-6060 was a massive upgrade in shift quality and strength.
| Feature | TR-6060 Improvements |
| Torque Capacity | Rated for 600+ lb-ft (significantly higher than the T-56). |
| Syncros | Triple-cone synchronizers on 1st/2nd; double-cone on others. |
| Shift Throw | Shortened internal rail travel for a “bolt-action” feel. |
| Gears | Wider, stronger gears with finer teeth to reduce noise and vibration. |
| Clutch | Paired with a twin-disc clutch (ZF Sachs) to reduce pedal effort while holding more power. |
Drivetrain Synergy & Performance
This combination was designed to be “bulletproof” for street and track use.
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Gear Ratios: The Viper’s 6th gear is a deep overdrive ($0.50:1$), allowing the car to cruise at 80 mph while the V10 barely hums at 1,500 rpm.
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Top Speed: The 8.4L/TR-6060 combo allows the Viper to reach its top speed of 202 mph in 5th gear (6th is strictly for fuel economy).
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Differential: Usually paired with a GKN ViscoLok speed-sensing limited-slip differential to help manage the 560 lb-ft of torque coming off the line.
Maintenance & Swaps (2026 Context)
If you are looking at this setup for a Restomod (putting a Viper V10 into a Challenger or Charger):
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Dimensions: The 8.4L is long. You will likely need to modify the firewall or radiator support in most classic Mopars.
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Electronics: To run the 8.4L outside of a Viper, you need the Mopar Gen IV Crate Controller or an aftermarket ECU like a Motec M150, specifically because of the complex Cam-in-Cam VVT.
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The “Viper Tax”: As of 2026, a complete 8.4L pullout (Engine + Transmission + ECU) typically commands between $28,000 and $35,000 due to the scarcity of the Gen IV/V parts.
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