Here's why:
* Multiple Engine Options: The G20 was available with several engine choices, each with its own transmission pairing.
* Transmission Variations: Even with the same engine, there might be different transmission options (manual vs. automatic, different gear ratios).
To figure out your transmission:
1. Check your VIN: The Vehicle Identification Number (VIN) can help identify your engine and trim level. This information can then be used to look up the transmission type in a repair manual or online database.
2. Look under the hood: The transmission is typically located behind the engine. The transmission case should have a label or tag with identifying information, including the model number.
3. Check the owner's manual: If you have the original owner's manual, it should list the specifications for your specific van.
Common Transmission Options:
* 4L60E automatic: This is a very popular transmission in GMs of that era.
* TH400 automatic: Also common, but less likely in a 1989 model.
* Manual transmissions: 4-speed and 5-speed manual transmissions were also available in the G20.
Once you have the specific information, you can look up the transmission size and other details. Let me know if you have any other information about your van!
