S197 Mustang TH400 Swap Package (Stage 1) | Next Gen Performance

Next Gen Performance Stage 1 TH400 Swap Package (2005–2014 Mustang GT)

At Next Gen Performance, we make transmission swaps simple. Typically, these projects involve a lot of guesswork, wrong parts, and fabrication headaches. With years of hands-on installation experience, our in-house team has developed complete, proven swap packages that eliminate the hassle and take out all the guesswork.

Our Stage 1 TH400 Package features a TH400 built by Proformance Race Transmissions, rated for 850 horsepower — the perfect entry-level setup for racers who want reliability and performance.

This transmission includes:

• Transbrake valve body

• Direct drum modified for instant transbrake release

• Clutch packs and unit end play clearance optimized for “low drag”, friction-free performance

Package Includes:

• Proformance TH400 Transmission

• Neal Chance Torque Converter – custom spec’d to your application

• SFI Flywheel (8-Bolt)

• SFI Bellhousing (pre-mated to the 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

Optional Add-On:

Upgrade with an AEM X-Series Transmission Temperature Gauge for accurate, real-time monitoring. These digital gauges deliver advanced functionality and high visibility:

• 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 via face buttons

• AEMnet CANbus-enabled for EMS/data logger integration

• 0–5V analog outputs for EMS/data logging

• 33% larger face display for improved readability

• 2-1/16" (52mm) housing, 0.825" slim depth

• Positive locking connectors for secure fit

Approximate Build Time: 2 weeks