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Luk LFW378 Clutch Flywheel
OE-Style Flywheel for GM Manual Clutch Service
The LuK LFW378 rigid clutch flywheel is built as a direct-fit replacement for select Chevrolet and GMC manual transmission applications. It provides a smooth, flat friction surface and OE-spec construction for consistent clutch engagement on vehicles such as the Chevrolet Blazer, Chevrolet S10, and GMC Sonoma.
For drivers servicing a worn flywheel on a GM truck or SUV, this part number offers a practical alternative to resurfacing when the existing unit is no longer serviceable. The LuK LFW378 is dynamically balanced to help reduce vibration and support stable clutch performance.
Key Features
- Rigid clutch flywheel for manual transmission clutch service
- OE-spec engineered and manufactured replacement
- Dynamic balancing helps reduce vibration
- Smooth, flat friction surface for proper clutch operation
- 168-tooth starter ring gear
- Flywheel thickness: 37.27 mm
- Overall casting O.D.: 349 mm
- Ring gear major diameter: 359.6 mm
- Ring gear number: BA 2110833
- Part number LFW378 for catalog and service reference
Detailed Description
The LuK LFW378 clutch flywheel is designed for GM applications that require a rigid flywheel with OE-style dimensions and balance. It features a 305 mm friction surface outer diameter, 166 mm inner diameter, 27.5 mm crank-to-friction surface measurement, and a 52.5 mm pilot I.D. These dimensions support proper clutch alignment and consistent contact between the clutch disc and flywheel surface.
This flywheel is listed for 1988-2005 Chevrolet and GMC applications, including Fits 1996-2005 Chevrolet Blazer, N/A; Fits 1996-2004 Chevrolet S10, N/A; Fits 1996-2001 GMC Jimmy, N/A; and Fits 1996-1997 GMC Sonoma, N/A. It also fits select Chevrolet C1500, Chevrolet K1500, GMC C1500, and GMC K1500 models with the specified Goodwrench engines. If you are replacing a worn flywheel on a Chevrolet S10 or GMC Sonoma, LFW378 provides a direct-service solution built around OE specifications.
This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.
What It Helps Fix
- Clutch chatter caused by an uneven or heat-spotted flywheel surface
- Vibration during clutch engagement from an out-of-balance flywheel
- Poor clutch contact due to wear on the friction face
- Starter ring gear wear on serviceable manual transmission setups
- Repeat clutch issues when resurfacing is no longer a reliable option
Installation Notes and Tips
Verify engine code and application details before installation, especially on Goodwrench-engine vehicles listed for this part. Inspect the clutch disc, pressure plate, pilot area, and release components at the same time to avoid repeat labor. Confirm ring gear tooth count, crankshaft bolt pattern, and pilot fitment before assembly. The LFW378 is a rigid flywheel, so proper torque sequence and clean mating surfaces are important for correct clutch operation.
Quality Assurance
LuK flywheels are engineered and manufactured to OE specifications and dynamically balanced for consistent performance. LuK, part of Schaeffler, has extensive experience in clutch release system development and drivetrain components.
| Brand | Luk |
| Part Number | LFW378 |
| Bolt Hole Pattern | 2 |
| Bolt hole PCD clutch pres.plte | 12.618 |
| Bolt hole PCD clutch pres.plte | 320.5 |
| Bolt hole PCD crankshaft | 2.992 |
| Bolt hole PCD crankshaft | 76 |
| Centering diameter / dowel hole | 12.835 |
| Centering diameter / dowel hole | 326 |
| Crank Hole Dia. | .472 |
| Crank Hole Dia. | 12 |
| Crank To Friction Surface | 1.083 |
| Crank To Friction Surface | 27.5 |
| Dowel hole diameter | .315 |
| Dowel hole diameter | 8 |
| Dowel Hole Pattern | 13 |
| Flange Thickness | .417 |
| Flange Thickness | 10.6 |
| Flywheel Friction Surface Inner diameter | 166 |
| Flywheel Friction Surface Inner diameter | 6.535 |
| Flywheel friction surface outer diameter | 12.008 |
| Flywheel friction surface outer diameter | 305 |
| Flywheel Thickness [mm] | 1.467 |
| Flywheel Thickness [mm] | 37.27 |
| Has Dowel Pins | Without dowel pins |
| I.D. for Pilot | 2.067 |
| I.D. for Pilot | 52.5 |
| Number of teeth, starter ring gear | 168 |
| Overall Casting O.D. | 13.740 |
| Overall Casting O.D. | 349 |
| Ring Gear Chamfer Position @ 6:00 O´clock | Not available |
| Ring Gear Chamfer Side | Not available |
This part fits 53 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2005 | Chevrolet | Blazer | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 2004 | Chevrolet | Blazer | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 2004 | Chevrolet | S10 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 2004 | GMC | Sonoma | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 2003 | Chevrolet | Blazer | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 2003 | Chevrolet | S10 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 2003 | GMC | Sonoma | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 2002 | Chevrolet | Blazer | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 2002 | Chevrolet | S10 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 2002 | GMC | Sonoma | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 2001 | Chevrolet | Blazer | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 2001 | Chevrolet | S10 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 2001 | GMC | Jimmy | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 2001 | GMC | Sonoma | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 2000 | Chevrolet | Blazer | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 2000 | Chevrolet | S10 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 2000 | GMC | Jimmy | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 2000 | GMC | Sonoma | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1999 | Chevrolet | Blazer | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1999 | Chevrolet | S10 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1999 | GMC | Jimmy | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1999 | GMC | Sonoma | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1998 | Chevrolet | Blazer | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1998 | Chevrolet | C1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1998 | Chevrolet | K1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1998 | Chevrolet | S10 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1998 | GMC | C1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1998 | GMC | Jimmy | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1998 | GMC | K1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1997 | Chevrolet | Blazer | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1997 | Chevrolet | C1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1997 | Chevrolet | K1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1997 | Chevrolet | S10 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1997 | GMC | C1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1997 | GMC | Jimmy | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1997 | GMC | K1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1997 | GMC | Sonoma | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1996 | Chevrolet | Blazer | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1996 | Chevrolet | C1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1996 | Chevrolet | K1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1996 | Chevrolet | S10 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1996 | GMC | C1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1996 | GMC | Jimmy | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1996 | GMC | K1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1996 | GMC | Sonoma | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1995 | GMC | K1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1994 | GMC | K1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1993 | GMC | K1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1992 | GMC | K1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1991 | GMC | K1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1990 | GMC | K1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1989 | GMC | K1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
| 1988 | GMC | K1500 | 4.3L | V6 | N/A | Used Only W/Goodwrench Engines 12456496, 12456499, 12456500 OR 12456501 |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.