1968–1977 Chevrolet Corvette NORS Clutch Plates TH375 / TH400 / M40 #8623113 / 8623849

Available for sale is a New Old Replacement Stock (NORS) Automatic Transmission Clutch Plate Set, part numbers 8623113 and 8623849, designed for 1968–1977 Chevrolet Corvette applications equipped with TH375, TH400, or M40 automatic transmissions (where applicable by configuration). These vintage service replacement components are ideal for Corvette transmission rebuilds requiring period-correct internal parts.

The 1968–1977 Chevrolet Corvette represents the early and mid-C3 generation, a period when Corvette evolved into a refined American performance car with strong small-block and big-block V8 offerings. Maintaining correct drivetrain components is essential for preserving both performance and originality in these highly collectible vehicles.

The Turbo-Hydramatic 400 (TH400), also known in Chevrolet terminology as the M40 transmission, is widely regarded as one of the strongest and most reliable automatic transmissions produced by General Motors. It was commonly used in high-performance and heavy-duty Corvette applications due to its durability and ability to handle increased torque output.

Clutch plates are critical internal transmission components responsible for engaging and disengaging gear sets under hydraulic pressure. They work in combination with friction discs and steel plates to provide smooth shifting and reliable power transfer throughout the transmission.

Over time, clutch plates can wear due to heat, friction, and repeated cycling. Common issues include glazing, warping, reduced friction performance, and inconsistent shift quality. Proper replacement during a transmission rebuild is essential for restoring original performance and reliability.

This set is offered as New Old Replacement Stock (NORS), meaning it was manufactured as a period service replacement part and has never been installed. These components were intended for dealership and professional transmission service use during the era.

Unlike used internal transmission components, NORS clutch plates provide fresh service life and help restore correct factory transmission operation. They are especially valuable for restorers seeking originality in drivetrain rebuilding.

As original GM TH400 and related transmission service components become increasingly difficult to source, vintage NORS internal parts remain highly sought after by Corvette restorers, transmission builders, and collectors.

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Product Features

• New Old Replacement Stock (NORS) transmission components
• Part Numbers: 8623113 / 8623849
• Automatic transmission clutch plates
• Designed for TH375, TH400, and M40 transmissions
• Suitable for select 1968–1977 Chevrolet Corvette applications (configuration dependent)
• Supports proper clutch engagement and smooth shifting
• Ideal for transmission rebuilds and restorations
• Unused vintage service replacement parts
• Factory-era drivetrain service components
• Rare Corvette transmission rebuild parts

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Vehicle Compatibility

Fits select:

• 1968 Chevrolet Corvette
• 1969 Chevrolet Corvette
• 1970 Chevrolet Corvette
• 1971 Chevrolet Corvette
• 1972 Chevrolet Corvette
• 1973 Chevrolet Corvette
• 1974 Chevrolet Corvette
• 1975 Chevrolet Corvette
• 1976 Chevrolet Corvette
• 1977 Chevrolet Corvette

Equipped with TH375, TH400, or M40 automatic transmission (application dependent).

Compatibility may vary depending on engine, transmission configuration, and internal specifications. Buyers should verify fitment using transmission build details and part numbers before purchase.

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Condition

This item is offered in New Old Replacement Stock (NORS) condition. The clutch plates have never been installed and remain unused vintage service components. Due to long-term storage, minor shelf wear, surface discoloration, preservative residue, or packaging imperfections may be present.

Please review all available photos carefully to determine exact condition before purchase.

For Corvette restorers, transmission specialists, and collectors, these 1968–1977 Chevrolet Corvette NORS TH375 / TH400 / M40 Clutch Plates #8623113 / 8623849 represent an excellent opportunity to obtain rare period-correct internal transmission components for a proper and reliable factory-style rebuild.