Service manual Isuzu 4L30-E Automatic Transmission

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Format: PDF
Type: Workshop Manual
Pages: 229
Size: 4,6 Mb

The Isuzu 4L30-E is a four-speed automatic transmission that was commonly used in various vehicles, particularly in the late 1980s and early 1990s. It was manufactured by General Motors (GM) and was also utilized by other car brands such as Isuzu, BMW, and Honda.

Here are some key characteristics and features of the Isuzu 4L30-E automatic transmission:

Speeds: It is a four-speed transmission, meaning it has four forward gear ratios and one reverse gear.

Gear Ratios: The gear ratios of the Isuzu 4L30-E vary depending on the specific model and application. Here is a general idea of the gear ratios:

1st gear: Typically around 2.85:1 ratio.
2nd gear: Usually around 1.57:1 ratio.
3rd gear: Approximately 1.00:1 ratio.
4th gear: Usually around 0.75:1 ratio.
Reverse gear: Varies, but generally around a 2.27:1 ratio.
Torque Converter: The 4L30-E incorporates a torque converter, which allows for fluid coupling between the engine and transmission. The torque converter provides torque multiplication and smooth power delivery.

Electronic Controls: The 4L30-E features electronic controls for shifting, line pressure regulation, and other transmission functions. These controls can be managed by an electronic control unit (ECU) that receives input from various sensors to determine the appropriate shifting points and transmission behavior.

Applications: The Isuzu 4L30-E automatic transmission was commonly used in a range of vehicles, including various Isuzu models like the Trooper, Rodeo, and Amigo, as well as certain BMW models such as the E34 5 Series and E36 3 Series. It was also utilized in some Honda Passport models.

It’s worth noting that while the Isuzu 4L30-E transmission has been widely used, it is an older design that may not be as prevalent in newer vehicles. Additionally, the specific details and specifications may vary depending on the year, make, and model of the vehicle in which the transmission is installed.

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