GM, TH350C w/Lock-Up, 28-3200 stall, "3/4 Race" Converter

GM 1977-UP TH350C lock-up 9.6” core (will not work in standard TH350)

PART# 97-1C28Q

$499.95   Suggested Retail
$449.95   Your Price
Estimated shipping date: 08/08/2017
Free Shipping
NOTE: The 3/4 RACE series converters are NOT designed to be used with Nitrous Oxide or Trans-Brakes. WARNING: Stall ranges will vary Depending on Engine set-up, Weight of vehicle, and Gear Ratio


Hays Performance Drivetrain is proud to announce the addition of Twister 3/4 Race Performance Torque Converters. Torque converters are a perfect addition to our line of performance Flex-plates, Clutches, and Flywheels. The 3/4 Race converter is the first series we are bringing to market. This series of converters is intended for street/strip combinations, with various stall offerings to accommodate any mixture of modifications including higher compression ratios, aftermarket camshafts, aftermarket cylinder heads, lower gear ratios, and vehicle weight loss. The name “3/4 Race Converters” perfectly describes a converter suited for an application just shy of Full Race, which is a series we will offer in the near future. Hays 3/4 Race Converters! Good names never go away, and neither should good terms!


  • 3/4 Race series converters are built, tested, and proven to support up to 650 HP.
  • State of the art Spray Welding process is used in select areas. Spray Welding provides clean, strong and consistent fusion while also increasing strength through hardening from higher process temperature
  • Each converter is hand-built and inspected in every step of assembly to ensure top of the line quality
  • All HAYS converters are internally welded compared to brazing. Testing has shown welding provides longer converter life while also enhancing consistency
  • Heavy duty Torrington bearings are used for greater strength and durability
  • Stators are built with high flow vents and channels to promote cooling in heat producing higher horsepower applications
  • Aircraft aluminum washers replace commonly used fiber washers, allowing more horsepower to be transferred while also drastically reducing failure due to wear
  • Increased horsepower and acceleration due to a weight saving, one application design. Almost all HAYS converters are built for one application to reduce weight compared to a multi-bolt pattern converter.
  • 3/4 Race series converters are offered in several different stall speeds for GM, Ford, and Chrysler transmissions
  • Industry leading Tech Support Team is available to provide assistance with stall speed selection


Anti-Balloon PlateNo
Bolt Circle10.75"
Crank Pilot Diameter1.703"
Emission Code3
Input Spline30
Lock Up/OverdriveYes
Product TypeTorque Converters
Series3/4 Race
TransmissionTH350 C
Use with Power AdderNo
Use with Trans-BrakeNo

Tech Resources

NOTE: The 3/4 RACE series converters are NOT designed to be used with Nitrous Oxide or Trans-Brakes. WARNING: Stall ranges will vary Depending on Engine set-up, Weight of vehicle, and Gear Ratio


This part is legal for use on Uncontrolled (Non-Emissions Controlled) Vehicles or Racing Vehicles.

The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles:

  • 1965 and older U.S. manufactured California Certified vehicles
  • 1967 and older U.S. manufactured Federally Certified vehicles
  • 1967 and older Foreign manufactured vehicle

Racing Vehicles are vehicles that are used exclusively for racing or other forms of competition that are not registered and that may never be used on the street.

*Free Shipping & Handling only offered to the continental US on orders over $100.

Some parts are not legal for use in California or other states with similar regulations.