Drivetrain› Automatic Transmissions and Components

Circle D Specialties

258mm Pro Series Torque Converter

$999.00

SKU: 11-10-05

In Stock
In Stock
Ships by Sep 9
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 258mm Pro Series torque converter is designed for LS or Gen-V LT swaps in front of Powerglide, TH350, or TH400 transmissions. This 258mm converter offers a variety of stall speeds to choose from and features a CNC-machined billet steel front cover with multiple bolt pattern options.
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The Circle D Specialties GM 258mm Pro Series Torque Converter is engineered for LS or Gen-V LT engine swaps paired with Powerglide, TH350, or TH400 transmissions. This converter offers a range of customizable stall speeds, allowing for precise tuning to your specific application. Its 258mm diameter and billet steel front cover, featuring versatile bolt patterns, ensure compatibility with most LS or LT flexplates, while the LS-length pilot eliminates the need for an extension sleeve. Construction highlights include a custom CNC billet front, full furnace brazing, a three-bearing setup, and hand TIG welding for exceptional durability and strength. These features contribute to a robust and reliable torque converter built to withstand demanding performance conditions. As a custom-manufactured product, please allow for a production lead time of 5-6 weeks.

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 Number11-10-05
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.

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.

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