Product Description
SOUTH BEND 10701066-1 DURAMAX SOLID FLYWHEEL – 2001–2005 LB7/LLY ZF-6 (REPLACES DUAL MASS)
Upgrade your manual-transmission Duramax with the South Bend 10701066-1 solid (single-mass) flywheel. Designed for 2001–September 2005 LB7/LLY 6.6L trucks equipped with the ZF-6 6-speed, this CNC-machined steel flywheel delivers durability, stable engagement, and long service life while replacing the factory dual-mass unit.
- Type: Solid mass (single-mass) steel flywheel
- Tooth count: 148-tooth ring gear
- Use case: OE replacement and performance clutch compatibility
- Benefits: Improved durability vs. dual-mass, precise balance, smooth engagement
FITMENT
- Engine: GM 6.6L Duramax LB7 (2001–2004) and LLY (2004.5–9/2005)
- Transmission: ZF-6 6-speed manual
- Vehicles: 2001–2005 Chevrolet Silverado 2500HD/3500HD & GMC Sierra 2500HD/3500HD
- Build window: Fits through September 2005 LLY trucks
WHAT'S INCLUDED
- South Bend 10701066-1 solid flywheel
- Mounting hardware (where applicable, per kit contents)
CROSS-REFERENCE / ALTERNATIVES
- Replaces factory dual-mass flywheel on ZF-6 trucks in this range
- Pairs with South Bend ZF-6 clutch kits for LB7/LLY (match by year/build date and input specs)
INSTALL NOTES
- Verify build date (through 09/2005) and ZF-6 manual transmission before ordering.
- Always follow torque specs and use new fasteners if required.
- Resurface is not applicable on many SMF designs; replace if worn beyond spec.
FAQ
Does this replace the OEM dual-mass flywheel?Yes. 10701066-1 is a solid mass (single-mass) replacement that takes the place of the factory dual-mass assembly on ZF-6 trucks in this model range.
What tooth count is the ring gear?
It uses a 148-tooth ring gear, matching the ZF-6 application.
Which years does it fit exactly?
It fits 2001–September 2005 LB7/LLY Duramax trucks equipped with the ZF-6 manual. Always verify your build date and transmission.
Is hardware included?
Some listings include hardware. Check the kit contents on this page; when in doubt, add new flywheel bolts during installation.
Will it work with performance clutch kits?
Yes—this flywheel is commonly paired with South Bend ZF-6 clutch kits for LB7/LLY. Match clutch selection to your power, use case, and build date.
