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Toyota6.0L & 6.4L Power Stroke Flexplate Bolt Installation Guide (2003–2010) — FP101
This guide covers installation of the XOTIC PERFORMANCE™ FP101 flexplate bolt kit for the 2003–2010 6.0L and 6.4L Ford Power Stroke. Prefer a printable copy? Download the PDF manual.
Washer orientation matters — chamfer toward the bolt head. The supplied washers have a chamfered inner diameter on one face, and that chamfer must face up, toward the underside of the bolt head, so it clears the fillet radius where the shank meets the head. Installed the other way round, the washer rides on that radius instead of sitting flat on the flexplate, and the joint never reaches proper clamp load.
Why flexplate bolts deserve attention
Flexplate bolts hold a thin steel plate — carrying the ring gear and the torque converter — to the end of the crankshaft, through a load case that never lets up. Every combustion event tries to accelerate the crank; the converter's fluid coupling resists. On a diesel those pulses are large, and the flexplate flexes by design, so the joint is worked continuously rather than held statically.
Once clamp load drops, the plate begins to move against the crank flange, the holes elongate, and cracks propagate from there — usually ending with the transmission back out of the truck. If you're already at the bellhousing, these are the cheapest fasteners in the driveline to get right. XOTIC PERFORMANCE™ fasteners are manufactured from our premium XOTIC 7200 steel alloy and backed by a lifetime warranty.
Before you start: verify first
Confirm that part number FP101 is compatible with your application before installing any components. Inspect the flexplate for cracks around the bolt holes and at the ring gear — new bolts will not save a plate that has already started to fail. Report any product damage to us before proceeding.
How to install flexplate bolts on a 6.0L or 6.4L Power Stroke
- Fit the washers chamfer-up. Install the supplied washers with the chamfered side facing the underside of the bolt head.
- Lubricate under the heads. Apply the provided assembly lubricant under each bolt head to minimise friction and ensure accurate torque readings.
- Fit the flexplate and hand-tighten. Place the flexplate onto the crankshaft flange and run all bolts in by hand before any torque goes on.
- Torque to 70 ft-lbs in an alternating cross pattern. Work across the plate rather than around it, so pressure is distributed evenly as the joint pulls up.
6.0L / 6.4L Power Stroke flexplate bolt torque spec
| Fastener | Torque | Pattern |
|---|---|---|
| Flexplate bolts | 70 ft-lbs | Alternating cross pattern |
A common mistake to avoid: torquing around the circle instead of across it. Going bolt-to-adjacent-bolt pulls one side of the plate down before the other and can leave the flexplate sitting slightly cocked on the flange — which shows up later as runout, converter vibration, and a cracked plate.
Frequently asked questions
What is the flexplate bolt torque spec for a 6.0L or 6.4L Power Stroke?
70 ft-lbs, applied in an alternating cross pattern with the washers chamfer-up and assembly lubricant under each bolt head.
Which way do the washers go?
Chamfered side up, toward the underside of the bolt head. The chamfer clears the radius under the head; flipped over, the washer rides on that radius instead of sitting flat.
Manual transmission — do I need this kit?
No. A manual truck uses a flywheel; see the 6.0L/6.4L flywheel bolt guide (FW104).
Does FP101 cover both engines?
Yes — the 6.0L and the 6.4L across the 2003–2010 range.
While you're back there
See our head stud guides for the 6.0L (CP874) and 6.4L (CP875).
Need help?
For technical support, email support@xotic-performance.com. All XOTIC PERFORMANCE™ fasteners are covered by our limited lifetime warranty. Finished your install? Tag #XOTICPERFORMANCE on Instagram for a chance to be featured.
© 2026 XOTIC PERFORMANCE™. This installation guide is an original copyrighted work of XOTIC PERFORMANCE™. Reproduction, distribution, or use of this content in whole or in part without written permission is prohibited. Doc ref: 2026.01.31 (web edition 2026.08).
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