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Drivetrain› Automatic Transmissions and Components

Circle D Specialties

GM HP Series 10L90 Torque Converter

$2,549.00 $2,249.00 Save $300.00

SKU: 27-07-05

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Circle D Specialties GM HP Series 10L90 Torque Converter is a custom-manufactured component designed for performance applications. It features a 258mm diameter and is built with a 5th-axis CNC-machined billet stator.

This torque converter is hand TIG welded throughout and offers various stall speed options to accommodate different engine and power-adder setups while maintaining streetability. It is recommended for applications up to 750 horsepower, with a Pro Series option available for applications over 850 horsepower.
Show original supplier description
The Circle D Specialties GM HP Series 10L90 Torque Converter is a custom-manufactured component designed to upgrade your vehicle's drivetrain. This converter is built upon the original factory specifications, enhanced with CNC-machined billet stator and impeller modifications. It also features custom internal clearances and Torrington style bearings for improved durability and performance. This torque converter is specifically recommended for applications up to 750 horsepower, with a Pro Series option available for applications exceeding 850hp. The GM HP Series 10L90 is designed for use in 2017+ Camaro ZL1 models and 2018+ GM vehicles equipped with the 10L90 transmission. A variety of stall speed options are available, ranging from 2800-3000 RPM up to 4200-4400 RPM, catering to different engine setups and power adders while maintaining streetability. The production time for this custom-manufactured product is estimated to be 5-6 weeks.
Vehicle Symptoms
  • Delayed acceleration from a stop
  • Shudder or vibration at highway speeds
  • Transmission slipping between gears
  • Poor fuel economy under normal driving
  • Transmission overheating under load
Diagnostic Codes
  • P0741 – Torque Converter Clutch Circuit Malfunction
  • P0742 – Torque Converter Clutch Circuit Stuck On
  • P0743 – Torque Converter Clutch Circuit Electrical
  • P0744 – Torque Converter Clutch Circuit Intermittent
Relevant Conversations
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  • 258mm billet torque converter install time
  • Circle D Specialties torque converter reliability
  • torque converter slipping after tune 10L90
  • replace torque converter 10L90 DIY tips

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandCircle D Specialties
Part Number27-07-05
CategoryDrivetrain
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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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