Stage 3 TH400 Transmission Swap Package | 1400HP Rated | Built by Proformance Racing Transmissions
Take the guesswork out of your transmission swap. At Next Gen Performance Center, we’ve streamlined the process with years of real-world installation experience—no more missed parts, endless fabrication, or frustrating trial and error. Our Stage 3 TH400 Transmission Swap Package is engineered for racers demanding reliability, durability, and performance. Designed for up to 1,400HP, this package includes everything needed to complete a professional-grade swap.
Built for Power – Rated to 1,400HP
This TH400 is hand-built by Proformance Racing Transmissions, featuring a bulletproof Pro Mod Sprag Assembly—a major upgrade from the 34-element sprag (rated to 850HP) to a version capable of withstanding up to 2,000HP.
Transmission Features:
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Race-prepped factory case
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Internal trans brake
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Reverse shift pattern
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NASA ER310 material input and intermediate shafts
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Billet aluminum Pro Mod direct drum
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36-element Sprag
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Billet forward clutch hub
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High-performance race material clutches
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Deep aluminum pan
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Case saver + 2nd gear snap ring support
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Rollerized output shaft
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Bushed center support
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2.48 low gear assembly
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High-pressure, high-volume pump assembly
What’s Included in the Complete Swap Package:
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Transmission Specialties 9" Torque Converter – Custom spec’d to your application
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SFI 8-Bolt Flexplate & Bolts
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SFI Bellhousing – Already mated to the transmission
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B&M Transmission Cooler w/ fittings and 23 ft. of cooler line
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Hurst Shifter
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Custom Built DSS Driveshaft w/ billet yoke
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Braided Stainless Transmission Dipstick
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ARP Torque Converter Bolts
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Transmission Mount
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All Required Adapters & Hardware
⏱️ Build Time: Approximately 2–3 Weeks
Whether you're upgrading for the track or prepping for a serious street machine, our Stage 3 TH400 swap kit is the most complete, no-hassle solution available. Built for ease, strength, and precision—we’ve done the work so you don’t have to.
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