Description
Product Overview
The Hasanbar 1240382 Speedometer Gear Housing Leak Stop Seal Kit is specifically designed for General Motors 700R4 and 4L60 automatic transmissions. This complete kit includes an outer O‑ring, speedometer shaft seal, seal retainer, lock washer, metric bolts, and a non‑metallic spacer, ensuring a perfect factory‑level fit. Crafted from premium rubber, synthetic materials, and corrosion‑resistant metal, the seals provide exceptional durability, chemical resistance, and a long‑lasting barrier against transmission fluid and fuel leaks. Dimensions of the kit components are engineered to match the original equipment specifications, delivering reliable performance and restoring accurate speedometer readings.
Usage
Designed for both professional repair shops and DIY vehicle owners, this seal kit is ideal for routine maintenance, transmission rebuilds, or addressing sudden leaks that affect speedometer accuracy. Install the kit during a transmission overhaul or as a targeted repair when you notice fuel leakage, dropping transmission oil levels, or erratic speedometer behavior. Suitable for a wide range of GM vehicles equipped with 700R4 or 4L60 transmissions, it ensures consistent performance across daily commuting, long‑distance travel, and demanding driving conditions.

Why Choose Us
Hasanbar is an authorized manufacturer, guaranteeing that every kit meets or exceeds OEM standards. Our seals undergo rigorous testing for temperature tolerance, pressure endurance, and chemical compatibility, providing confidence in leak‑free operation. The comprehensive component list eliminates the need for additional parts, reducing installation time and potential errors. Backed by a reputable warranty and supported by detailed installation instructions, this kit offers a trustworthy solution for maintaining transmission integrity.
Key Features
- Exact OEM fit for GM 700R4 and 4L60 transmissions
- High‑grade rubber and synthetic materials ensure superior durability
- Complete seal set includes O‑ring, shaft seal, retainer, washer, bolts, and spacer
- Stops fuel and transmission fluid leaks, preserving accurate speedometer readings
- Authorized Hasanbar product with quality assurance and warranty support
FAQ
Will this kit fit other transmission models?
The kit is engineered specifically for GM 700R4 and 4L60 transmissions. While it may physically fit similar designs, we recommend using the exact match to ensure optimal sealing performance.
Do I need special tools to install the seal kit?
Standard hand tools such as a torque wrench, screwdrivers, and a seal puller are sufficient. Detailed instructions are included to guide you through each step.
How long will the seals last under normal driving conditions?
When installed correctly, the high‑quality materials are designed to last the lifetime of the transmission under typical operating temperatures and pressures.
Can I replace the seals myself, or should I seek professional help?
Experienced DIYers can install the kit with basic mechanical skills. However, if you are unfamiliar with transmission work, professional installation is advisable to avoid damage.
What warranty does Hasanbar provide for this seal kit?
Hasanbar offers a limited warranty covering manufacturing defects. Please refer to the included warranty card for specific terms and conditions.





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