Drivetrain› Automatic Transmissions and Components

Circle D Specialties

Pro Series Torque Converter

$2,249.00

SKU: 11-10H-34-SL

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 Pro Series torque converter is a durable and adjustable option for high-horsepower street and track cars. Designed for use in vehicles with 800+ horsepower, this converter is a suitable match for big power turbo, blower, or nitrous engines. It features a billet front cover with a multiple bolt pattern and a screw-on pilot for universal fitment, with custom bolt pattern options available. The converter includes anti-balloon plates on the pump and turbine, a CNC-machined steel stator for adjustability, and furnace-brazed, hand-TIG-welded fins.
Show original supplier description
The Circle D Specialties Pro Series torque converter represents their most durable and adjustable offering for high-horsepower street and track applications. Engineered to handle over 800 HP, it's an ideal complement to turbo, blower, or nitrous-equipped engines. Key construction features include a billet front cover with a multiple bolt pattern, a screw-on pilot for universal compatibility, and options for custom bolt patterns. Inside, anti-balloon plates protect the pump and turbine, while a CNC-machined steel stator provides maximum adjustability. The fins are furnace brazed and hand TIG welded for enhanced durability. This Pro Series converter is available with either a spragless or mechanical diode one-way clutch, and various stall speed options ranging from 3600-5800 RPM. It also offers multiple input shaft spline and diameter options, including 1" - 30 Spline (PG/TH350/TH400 Turbo Spline), 1-3/16" - 27 Spline, 1-1/4" - 29 Spline, and 1-1/8" - 35 Spline to ensure compatibility with a wide range of transmissions. Please note that this is a custom-manufactured product with a lead time of 4-6 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

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 Specialties
Part Number11-10H-34-SL
CategoryDrivetrain

We’re here — turning wrenches, just like you.

Call us, follow along, or come say hi.

(760) 282-4645 Instagram Google

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