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Start ShoppingCometic C9465 4-Speed Transmission Gasket - Harley-Davidson Panhead/Shovelhead Replacement
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Description
Upgrade your Harley-Davidson transmission's sealing performance with Cometic's high-grade 4-speed transmission gasket. This critical component ensures optimal fluid retention, preventing leaks and maintaining peak engine efficiency for classic Panhead and Shovelhead motorcycles.
Key Features
- Fiber Gasket Material: Cometic's proprietary cellulose/composite blend offers superior heat resistance and sealing integrity for demanding transmission environments.
- Direct Replacement Design: Precision-engineered to fit original equipment specifications for Harley-Davidson Big Twin 4-speed gearboxes.
- Application-Specific Fit: Perfectly contours to Panhead and Shovelhead transmission end covers for seamless installation.
- Single Gasket Packaging: Convenient, no-waste packaging ensures you get exactly what you need for your repair.
Why Choose This Product
Cometic's 4-speed transmission gasket delivers unmatched durability and reliability for classic Harley-Davidson engines. Its advanced composite material resists degradation from transmission fluids and heat, reducing the risk of leaks and costly repairs. The precise fitment ensures easy installation without modifications, while the reinforced construction maintains proper sealing under high-performance conditions. This essential component is trusted by mechanics and riders alike for its ability to restore and maintain optimal transmission function in vintage motorcycles.
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Upgrade your Harley-Davidson transmission's sealing performance with Cometic's high-grade 4-speed transmission gasket. This critical component ensures optimal fluid retention, preventing leaks and maintaining peak engine efficiency for classic Panhead and Shovelhead motorcycles.
Key Features
- Fiber Gasket Material: Cometic's proprietary cellulose/composite blend offers superior heat resistance and sealing integrity for demanding transmission environments.
- Direct Replacement Design: Precision-engineered to fit original equipment specifications for Harley-Davidson Big Twin 4-speed gearboxes.
- Application-Specific Fit: Perfectly contours to Panhead and Shovelhead transmission end covers for seamless installation.
- Single Gasket Packaging: Convenient, no-waste packaging ensures you get exactly what you need for your repair.
Why Choose This Product
Cometic's 4-speed transmission gasket delivers unmatched durability and reliability for classic Harley-Davidson engines. Its advanced composite material resists degradation from transmission fluids and heat, reducing the risk of leaks and costly repairs. The precise fitment ensures easy installation without modifications, while the reinforced construction maintains proper sealing under high-performance conditions. This essential component is trusted by mechanics and riders alike for its ability to restore and maintain optimal transmission function in vintage motorcycles.| SKU | GM900DC8FD |
|---|---|
| MPN | C9465 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Harley-Davidson | FL (Big Twin) | 1941-1947 |
| Harley-Davidson | FL / Hydra-Glide / Duo-Glide | 1948-1965 |
| Harley-Davidson | FL / FLH (Shovelhead) | 1966-1972 |
| Harley-Davidson | FL / FLH / FX / FXE / FXEF (Shovelhead) | 1973-1984 |
Frequently Asked Questions
It is designed for classic Big Twin 4‑speed transmissions used on Panhead and Shovelhead models. Always verify against your Harley parts book or a fitment chart for your exact year and model.
Cometic gaskets are designed to seal well on clean, flat surfaces and can typically be installed dry. Some builders prefer a very light film of non‑hardening gasket dressing; avoid heavy silicone beads.
No. Once compressed and exposed to oil and heat, it should be replaced any time the transmission cover is removed.
If the leak is caused by a damaged or aged gasket and the mating surfaces are in good condition, replacing the gasket with this Cometic part is an appropriate repair.
No. It is a high‑quality aftermarket replacement made by Cometic, intended to replace the original Harley-Davidson transmission gasket.
Installation Guide
Difficulty
Medium
Est. Time
1 hr 0 min
Tools Required
- Basic SAE wrench and socket set
- Screwdrivers
- Torque wrench (inch‑lb/ft‑lb appropriate for transmission cover bolts)
- Plastic or rubber scraper for old gasket removal
- Brake cleaner or degreaser
- Lint‑free rags
Pro Tips
- Clean both mating surfaces thoroughly and let them dry before installing the new gasket
- Test‑fit the gasket on the cover to confirm bolt hole alignment before applying any sealant (if used)
- Use only a very light film of non‑hardening gasket dressing if desired; often dry install is sufficient with quality gaskets
- Tighten bolts in a criss‑cross pattern and torque to the factory service‑manual specification
- After installation, check for weeping after the first ride and re‑torque bolts if the service manual allows
Common Mistakes to Avoid
- Reusing old gasket instead of replacing
- Failing to completely remove old gasket material and sealant from mating surfaces
- Over‑tightening transmission cover bolts and deforming the gasket
- Installing gasket on oily/dirty surfaces, leading to leaks
- Using excessive silicone sealant which can squeeze into the transmission case
Comparison vs Stock/OEM
Functionally equivalent to the OEM Harley transmission gasket but produced by Cometic, a performance gasket specialist.
Improvements
- Aftermarket performance-oriented gasket material designed for oil sealing
- Consistent cut and bolt-hole alignment from precision manufacturing
- Often more readily available and less expensive than obsolete OEM Panhead/Shovelhead parts
Considerations
- Must still rely on clean, flat mating surfaces for best results
- Not a metal-reinforced part; correct torque and pattern are important to prevent distortion
Durability & Warranty
Expected Lifespan
Typically lasts many years in street use if properly installed and mating surfaces remain flat; often replaced only when the transmission cover is removed.
Warranty
Covered by Cometic’s standard gasket warranty through the retailer; details vary by seller.
Maintenance
Periodically inspect for seepage around the transmission cover area; correct fastener torque per the service manual and address any leaks promptly.
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