Next Gen Performance Stage 4 TH400 Swap Package (2005–2014 Mustang GT)
At Next Gen Performance, we make transmission swaps simple. Traditionally, these projects involve guesswork, incorrect parts, and heavy fabrication. With years of in-house installation experience, our team has developed complete, bolt-in swap packages that remove all the hassle and uncertainty.
Our Stage 4 TH400 Package features a TH400 built by Proformance Race Transmissions, ideal for racers who want a three-speed transmission rated to 2000+ HP.
The key to this transmission’s durability is the Pro Mod Sprag Assembly. While a standard Borg Warner 34-element sprag is rated to 850 HP, the Pro Mod Sprag is engineered to withstand 2000 HP.
Transmission Specs:
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Reid Bell Roller Tail
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2.48 / 1.48 / 1.00 3-Speed Gear Set
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PRT Race Center Support
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300M Main Shaft
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36-Element Aluminum Direct Drum
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1” 30-Spline Vasco Input Shaft with Steel Drum
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Billet Steel Forward Hub
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Race Pump with Split Circuit and Jet Fitting
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Billet Valve Body (available with Clean Neutral)
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Deep Transmission Pan
Package Includes:
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Proformance TH400 Transmission
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Neal Chance 9" Torque Converter – custom spec’d to your application
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SFI Flywheel (8-Bolt)
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SFI Bellhousing (pre-mated to transmission)
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Flexplate Bolts
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Transmission Mount
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B&M Transmission Cooler with fittings and 23 ft of cooler lines
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Hurst Shifter
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Custom PST Driveshaft with billet yoke
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Flexible Braided Dipstick
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ARP Converter Bolts
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All required adapters and installation hardware included
Optional Add-On:
Upgrade with an AEM X-Series Transmission Temperature Gauge for precise, real-time monitoring. These digital gauges combine advanced functionality with superior readability:
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Auto-dimming sensor for ideal brightness
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87% larger programmable center LED
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Standard or metric display (100–300°F / 40–150°C)
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Selectable warning thresholds
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Peak/recall via gauge face buttons
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AEMnet CANbus-enabled for EMS/data logger integration
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0–5V analog outputs for EMS/data logging
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33% larger face display for quick readings
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2-1/16" (52mm) housing, 0.825" slim depth
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Positive locking connectors for secure fit
Approximate Build Time: 3 weeks
