Next Gen Performance Stage 2 TH400 Transmission Swap Package | 2018–2023 Mustang GT
At Next Gen Performance, we make transmission swaps easy. Traditionally, these conversions involve a ton of guesswork, wrong parts, and unnecessary fabrication time. With years of hands-on install experience in our in-house facility, we’ve developed complete bolt-in TH400 swap packages that take out all the uncertainty — giving you a proven, reliable solution for your high-horsepower Coyote Mustang.
Our Stage 2 TH400 Package includes a TH400 transmission built by Proformance Racing Transmissions, rated for 1200+ horsepower. Each transmission is hand-built to deliver unmatched reliability and performance on the street or strip.
TH400 Transmission Features:
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Built by Proformance Racing Transmissions – trusted by top drag racers
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Rated for 1200+ HP
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Transbrake Valve Body for instant engagement
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Direct Drum Modified for fast transbrake release
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Pro Mod Drum Upgrade – added strength for extreme power levels
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Low-Drag Clutch Packs & End Play Clearance for friction-free operation
Complete Package Includes:
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Custom Torque Converter – tailored to your exact setup
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SFI-Certified Flywheel (8-Bolt)
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SFI-Certified Bellhousing – pre-installed and mated to the transmission
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Flexplate Bolts & ARP Converter Bolts
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Transmission Mount
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B&M Transmission Cooler with fittings and 20 ft. of cooler line
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Hurst Shifter – proven performance and reliability
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Custom-Built PST Driveshaft with billet yoke
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Flexible Braided Locking Dipstick
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All Required Adapters & Hardware – everything needed for installation
⚙️ Required:
Optional Add-On:
AEM Electronics X-Series Transmission Temperature Gauge
For accurate transmission temperature readings and superior visibility, AEM’s X-Series digital gauges deliver modern performance and style with features like:
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Auto-dimming display for ideal brightness
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33% larger gauge face for better readability
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°F/°C display (100–300°F / 40–150°C)
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Programmable LED warnings
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Peak/recall via gauge face buttons
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AEMnet CANbus + 0–5V analog outputs
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Compact 52mm housing and slim design for easy mounting
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Positive-lock connectors for secure connections
Build Time: Approximately 2–3 weeks
Fits: 2018–2023 Mustang GT (Coyote)
Take the guesswork out of your transmission swap. Trust Next Gen Performance for a proven, high-quality TH400 swap package built to handle serious power and deliver race-ready performance.
