Description
Product Overview
The Dexonu Transmission Reverse Servo Pin Extender is engineered for TH-400 and 4L80E automatic transmissions. Constructed from high‑grade rubber, the extender provides a flexible yet robust connection for the reverse servo piston. The kit includes a precision‑molded cover gasket and a seal that fit the original equipment specifications, ensuring a leak‑free assembly. Dimensions are 9.45 x 0.79 x 9.06 inches and the unit weighs only 1.76 ounces, making it easy to handle during installation.
Usage
Designed for both professional repair shops and home garages, this extender restores proper reverse function when the original seal wears out or the commutation belt slips. Install the pin extender during routine transmission service or when diagnosing reverse‑gear issues. It is compatible with standard TH-400 and 4L80E models, making it a versatile solution for a wide range of GM and Dodge vehicles.

Why Choose Us
Dexonu combines decades of automotive expertise with rigorous quality control. Each component is tested for durability and exact fit, reducing the risk of re‑work. The rubber material resists heat and chemical exposure, while the plain bearing design ensures smooth movement without additional lubrication. Our kits are backed by a satisfaction guarantee, giving you confidence in long‑term performance.
Key Features
- High‑quality rubber construction for durability and flexibility
- Includes cover gasket and seal for a complete, leak‑free repair
- Exact fit for TH-400 and 4L80E transmission models
- Lightweight design simplifies handling and installation
- Reduces reverse‑gear slippage and restores smooth operation
FAQ
Will this kit fit a 4L80E transmission from a 2005 Dodge Ram?
Yes, the extender is engineered to match the specifications of both TH-400 and 4L80E transmissions, including those used in 2005 Dodge Ram models.
Do I need additional grease or lubricant for the plain bearing?
The plain bearing is designed to operate without extra lubrication, but a thin layer of transmission‑grade grease can be applied if desired for added protection.
Can I install the kit myself without special tools?
Installation requires basic hand tools such as a socket set and a torque wrench. Detailed instructions are included, and the lightweight design makes the process straightforward for experienced DIYers.
What is the warranty period for this product?
Dexonu offers a one‑year limited warranty covering manufacturing defects and material failures.
Is the kit compatible with other transmission models?
The kit is specifically sized for TH-400 and 4L80E. While it may physically fit similar designs, we recommend using the exact match for optimal performance.






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