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Refundable Core Charge: $100.00


The SunCoast Pro-Loc TH400 Torque Converter is manufactured from a solid piece of 7075 T6 billet aluminum plate versus round bar like so many other manufacturers. We take this extra step in manufacturing from solid billet plates due to the superior heat-treating characteristics. When using round bar, we see the tempering is not as solid in the center as solid plate. While using this type of material increases manufacturing cost, it is a necessary step when considering the high inertia and its effects on ballooning the converter.

The SunCoast Pro-Loc Bolt-Together converter also includes our patent-pending Zero-Drag Lockup technology which:

  • Allows constant oil flow across the clutch surfaces extracting heat and improving lifespan
  • Less parasitic loss, resulting in more power to the ground
  • Quicker throttle response
  • Faster spooling of aftermarket larger turbochargers

The modular clutch basket assembly allows several clutch configurations for maximum tunability. The user can choose between 1-5 double-sided Zero Drag clutches. This modular design allows for unmatched time savings for servicing between rounds to accommodate changing track conditions. Turbine clearance is redesigned to a fixed clearance with a tighter tolerance, reducing slip and allowing for a more-efficient torque converter. This fixed turbine clearance also improves consistency and allows two thrust bearings to be used versus the factory phenolic thrust washers.

The sprag assembly is also replaced with our SunCoast Pro-Loc XL sprag that increases bearing roller surface by an additional 15%, improving reliability.

Another great feature of this converter is its 3-pass design, allowing for individual control of the converter circuit. This is much more effective than a simple two-pass lock-up system where you do not have unique control of how the converter lock-up is brought in. This is can be pulse-width modulated for a softer hit to the tires if desired.

This converter is manufactured with provisions for 12 bolt holes to the flexplate. All of this is clamped together with 24 12-point 5/16” nuts and captive SAFE-D studs. It also comes with a serviceable brass pilot that can be developed for any needed converter spacing. We have also taken the liberty of numbering the torque sequence to help in reassembly.

SunCoast also utilizes its exclusive one-piece pad, maintaining rigidity and strength. All SunCoast Torque Converters are proudly designed, engineered, and manufactured in-house in Fort Walton Beach, Florida, by American workers.


  • GM-TH400-PRO-LOC
  • GM-TH400-PRO-LOC
  • GM-TH400-PRO-LOC
  • SunCoast Diesel
  • New


Shipping Information

  • Item Requires Shipping
  • 40.0 lbs.
  • W14.0000” x H14.0000” x L16.0000”

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