ATS Diesel 2003-07 Ford 6.0L 5R110 Billet Flexplate (SFI Certified)
A 2003-2007 Ford Super Duty or Excursion with the 6.0L Power Stroke that has picked up a rhythmic knock at idle, a clunk from the bellhousing when it drops into gear, or a starter that grinds and skips is often blamed on injectors or the transmission first. On a truck that has been tuned, tows heavy or has already been through a plate or two, the flexplate is the part to look at. The ATS Diesel 305-900-3278 is a billet steel flexplate built for the 6.0L and 5R110W TorqShift combination and certified to the SFI flexplate standard. It is sized for owners who want the plate between the crank and converter to stop being the weak link.
The flexplate bolts to the rear flange of the 6.0L crankshaft and the torque converter bolts to the outer ring of the plate, so every pound-foot the engine makes goes through it before the 5R110W ever sees it. It also carries the ring gear the starter drives. A stock plate is stamped from relatively thin sheet steel so it can flex slightly as the crank and converter move, and that flex is where fatigue cracks start: around the crank bolt circle and at the converter lug holes. A diesel firing pulse at low rpm, a big tune and repeated hard launches or loaded hill pulls all add up. ATS machines this plate from solid billet steel rather than stamping it, which puts far more material in the areas that crack, and the SFI certification means the design passed a burst and strength standard rather than just a fit check.
A cracked plate sets no trouble codes. If the truck also has shift flare, delayed engagement or limp mode with stored P07xx or P27xx codes, that is a separate solenoid body or clutch problem; our 5R110 shift solenoid symptoms and testing guide walks through those so you do not buy a flexplate for a hydraulic fault.
Remove the starter or the lower inspection cover and look at the plate with a strong light while someone bumps the engine over in short bursts. You are looking for cracks radiating from the crank bolt holes, cracks between converter lugs, loose or elongated converter bolt holes and missing ring gear teeth. Grab the converter through the opening and check for back-and-forth movement against the plate. If the knock is still unclear, our 5R110 TorqShift service guide covers the checks a shop runs before pulling the transmission.
This listing is for 2003-2007 Ford trucks with the 6.0L Power Stroke diesel and the 5R110W automatic, which means F-250 and F-350 Super Duty pickups and the 6.0L Excursion. It does not fit the 7.3L with the 4R100, the 6.4L, or the 6R140 used from 2011. Early 2003 Super Duty trucks were built with either the 7.3L or the 6.0L, so check the engine before ordering; if yours is a 7.3L, look at the BD 7.3L 4R100 flex-plate instead. Some converter catalogs pair this plate with billet-cover aftermarket converters, so confirm your converter's lug pattern and pilot with ATS or its builder, or send us your year, VIN and converter part number and we will check it. Every part we carry for this transmission is on the 5R110 TorqShift parts page.
| Brand | ATS Diesel |
| Part number | 305-900-3278 |
| Fits | ATS Diesel 2003-07 Ford 6.0L 5R110 Billet Flexplate (SFI Certified) |
| Type | Flexplates |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. This plate is for the 2003-2007 6.0L Power Stroke with the 5R110W. The 2008-2010 6.4L takes its own plate under a different part number. For a 6.4L, see the BD 1041240 flex-plate.
ATS markets it as compatible with stock and aftermarket converters, but some converter builders specify it with billet-cover units. Confirm the converter lug pattern and pilot before install, or send us your VIN and converter part number.
It means the design was tested to the SFI Foundation flexplate standard for strength and burst resistance. Racing sanctioning bodies commonly require SFI parts in the driveline, and it is a good sign for a heavily tuned or towing 6.0L.
No. A cracked plate makes noise, vibration and starter problems but sets no codes. Transmission codes on a 6.0L point to the solenoid body, clutches or wiring, not the flexplate.
Crank-to-flexplate bolts, the front pump seal and the filters at minimum. Inspect the converter hub and pilot, and consider a shift kit if the truck is tuned.
Mercon SP. Check the level hot, in Park, engine idling, after the truck has been driven to full operating temperature.
