What size transmission is in the 4l80?

The 4L80, a robust automatic transmission, is not something that contains another transmission; rather, the question refers to its physical dimensions. The size of a 4L80 (and its close variant, the 4L85E) transmission varies depending on its specific configuration, primarily determined by its application, such as 2-wheel drive (2WD) or 4-wheel drive (4x4) and whether it's a standard or heavy-duty (HD) version. These variations primarily affect the overall length.

Understanding 4L80 Transmission Dimensions

When discussing the "size" of a 4L80, it generally refers to its length. This is a critical measurement for vehicle compatibility, especially when performing swaps or replacements. Different tailshaft housing lengths and output shaft configurations account for these variations.

The key dimensions typically measured include:

• Overall Length (Dimension 'A'): This measurement is usually taken from the front face of the bellhousing to the end of the tailshaft housing or output shaft.
• Mounting Point Length (Dimension 'B'): This dimension measures the distance from the front face of the bellhousing to the center of the crossmember mounting pad on the transmission case.

For more detailed dimensional diagrams, you can often find resources that illustrate these specific measurements for GM 4-speed overdrive transmissions like the 4L80E and 4L85E.

Specific Dimensions by Configuration

Here are the typical length specifications for various 4L80 and 4L85E configurations:

Note: The mount point length (B) remains consistent across most 4L80E/4L85E variations, indicating a standardized mounting position relative to the bellhousing. The significant differences in overall length (A) are due to variations in tailshaft housings and output shaft designs tailored for 2WD or 4x4 applications.

These dimensions are crucial for ensuring proper fitment and driveline alignment when installing or replacing a 4L80 transmission in a vehicle.