Billet 4R100 and E4OD torque converters for Power Stroke towing, street and race builds. 12 inch, 11 inch and 252mm to 265mm from Circle D Specialties, Houston, TX.
12" Factory Design Billet Front Cover New 3 Disk Luk Clutch Pack Furnace Brazed Pump and Turbine Torrington Bearings on all 3 Thrust Surfaces 4 ...
View full details
Billet Front Cover New 3 Disk Luk Clutch Pack Furnace Brazed Pump and Turbine Torrington Bearings on all 3 Thrust Surfaces 4 or 6 lug options t...
View full details
This converter is designed for the big power twin screw supercharged Lightnings. Can be used on the street or the strip. Our best performing option...
View full details
Looking for a converter to spool your turbo Lightning? This is it. Smaller 10 1/4" core for improved launch but still maintains good top end effici...
View full details
This is our most durable and adjustable option for the high hp street/track cars. Designed for use in 800+HP, this converter is the perfect match f...
View full details
Let's talk about torque converter clutch drag when using a multi disc torque converter in a 4L80E transmission. We see this issue come up from time to time, especially (but not limited to) in 4L80E applications equipped with a transbrake...
Today we're diving in to the often debated & sometimes mysterious topic of single disc vs. multi disc lock-up torque converters for use in common OEM-based overdrive transmissions. To begin, we need to understand the purpose of a torque...
How Can We Help?
Check Order Status Live build stage and production date — instantly Estimated Build Time Current lead times, and what moves them Converter Service & Repair Start a service request and get an RMA Custom Converter Spec Tell us the build and we will spec it Shipping & Lead Times What to expect, and how we shipQuick Answers
Live chat is offline
Chat runs Mon–Fri, 8am–5pm CT. Leave a message and it gets read first thing.
Leave a MessageOr call (713) 895-8834 · sales@circledspecialties.com.
Check Order Status
Ordered through a dealer or salesperson? The email on the order may not be yours — reply to your order confirmation and we will look it up.
