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Celebrating 250 Years of American Freedom, All Year Long! More Horsepower. More Burnouts.
Celebrating 250 Years of American Freedom. More Horsepower. More Burnouts.
GM 258mm Pro Series PG/350/400 Torque Converter

Circle D GM 258mm Pro Series PG/350/400 Torque Converter

by Circle D Specialties
258mm Stall Option: Ask CDS
Sprag Option: Stock
Special Order Item: This item is not stocked in-house and may require additional processing time before shipping. Details
Made to Order (In-House): This item is built/assembled by our team. Build times vary by product — please refer to the product description for the most accurate lead time. Details
Special Order Made to Order
$999.00 - $1,299.00
$999.00
$999.00 - $1,299.00
$999.00

Product details

Running an LS or Gen-V LT swap in front of a Powerglide, TH350, or TH400 transmission? This is the right converter for you! Our 258mm option will provide you with a variety of stall speeds to choose from. Our CNC-machined billet steel front cover features a variety of bolt pattern options to suit virtually any LS or LT flexplate out there. An LS-length pilot eliminates the necessity for any pilot extension sleeve. Heavy duty TIG welded fins & full furnace brazing ensure the strongest possible converter possible!
  • Custom CNC Billet Front
  • Fully Furnace Brazed
  • 3 Bearing Setup
  • Hand TIG welded


Ordering and production

Estimated lead time: 7–8 weeks before shipment. This includes Circle D's current production estimate plus additional time for specification review, order surges and the third-party handoff. It is an estimate, not a guaranteed delivery date.

SMGspeed may contact you after checkout to confirm the vehicle, transmission, engine combination, power level, power adder, intended use and requested stall before submitting the build.

Core notice: Some factory-core applications require a usable customer core. Any selection labeled CORE REQUIRED is priced with that requirement. Core freight, missing cores or unusable cores may create additional charges. SMGspeed will confirm any core requirement before production.

Custom made-to-order item: Review all selections carefully. Changes or cancellation may not be possible after production begins.

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