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