2008-2010 Ford 6.4L Powerstroke 650hp Low-Stall Torque Converter FT0865LS

The Diamond T FT0865LS is a remanufactured 650hp triple disk, low-stall torque converter built for 2008-2010 Ford F-250 and F-350 6.4L Powerstroke trucks with the 5R110W automatic transmission. It uses triple barring construction and an 8-stud billet cover and is rated for up to 650hp and 1,100 lb-ft with a stall speed approximately 200rpm lower than stock. Diamond T keeps each unit's original matched components together during the rebuild, and it carries a lifetime, non-transferable manufacturer's warranty.

650hp Rated, Lower Stall Speed

The FT0865LS is built for trucks running up to 650hp and 1,100 lb-ft that want a lower stall speed to build boost sooner, roughly 200rpm below stock. Reaching the advertised output depends on adequate supporting modifications and appropriate tuning; the required combination varies with the truck's target output and existing setup. If a standard stall speed at the same output level fits your build better, the FT0865 uses the same rating without the stall reduction. For output above 650hp/1,100tq, the FT0310 is the applicable option.

How Diamond T Rebuilds This Converter

Diamond T keeps each converter's original internal components together as a matched set instead of mixing parts from different cores, a practice common among mass remanufacturers. Housing thickness is measured against OEM specification, and any housing that falls short is replaced rather than resurfaced. Each unit is balanced on a computerized balancer, built with clutch material, and pre-charged with transmission fluid to limit internal rust before installation. Every converter is quality-tested before it ships.

Choosing Between the 650hp Converters

Specifications

Core Charge and Return Process

• A core charge is added at checkout unless you send your core in first.
• Sending your core in first means your order is not processed until the core arrives, and a 5% cancellation fee applies if you cancel before it ships.
• Paying the core charge lets your order ship right away; your core charge is refundable if the core is received within 60 days of your ship date.
• After 60 days, a 10% per-month late fee is deducted from the core refund. Return shipping for the core is the customer's responsibility.

Common Ordering Mistakes

• Ordering the low-stall FT0865LS when the build actually wants the standard-stall FT0865, or vice versa.
• Exceeding the 650hp/1,100tq rating without stepping up to the 1,000hp FT0310.
• Confusing the 5R110W (6.4L) transmission with the 5R110 (6.0L) application.
• Missing the 60-day core return window, which triggers a 10% per-month late fee.

Final Check Before Ordering

• Confirm your truck is a 2008-2010 Ford F-250 or F-350 with the 6.4L Powerstroke and 5R110W transmission.
• Confirm your build's target output is at or below 650hp and 1,100tq.
• Decide whether low stall (this converter) or standard stall (FT0865) fits your driving needs.
• Note the refundable core charge and that core return shipping is the customer's responsibility.
• Match part number FT0865LS for the 650hp low-stall triple disk converter.

FT0865LS is the applicable option for a 650hp-rated, low-stall triple disk converter behind a 2008-2010 6.4L Powerstroke with the 5R110W transmission.

Frequently Asked Questions