Sale

Drivetrain› Automatic Transmissions and Components

Circle D

HP Series 300mm Torque Converter

$999.00 $899.00 Save $100.00

SKU: 05N-09-09-1A

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 GM 300mm HP Series 6L80 Torque Converter is a custom-manufactured upgrade for OE 6L80 converters. It features a 300mm diameter, a factory stall speed option (1800-2000rpm), and is constructed with billet components for enhanced durability.
Show original supplier description
The Circle D GM 300mm HP Series 6L80 Torque Converter is designed as a significant upgrade over the original equipment (OE) 6L80 converters, offering a balance of daily-driver usability and enhanced performance. This custom-manufactured unit is built with robust billet components, ensuring longevity and reliability. The converter boasts a 300mm diameter and offers a factory-style stall speed option ranging from 1800 to 2000 RPM, making it suitable for everyday driving while still providing improved performance characteristics. Key construction highlights include a billet front cover and a billet lockup apply piston, a furnace brazed impeller for optimal heat dissipation and durability, a flanged style hub, and a bearing retainer for smooth operation. This torque converter is specifically engineered for the 6L80 transmission, providing a no-brainer upgrade solution for trucks equipped with this transmission.

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

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandCircle D
Part Number05N-09-09-1A
CategoryDrivetrain
5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold
(760) 282-4645 hello@motormia.co

Buy with Confidence

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.

View Full Return Policy

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.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy