1. VIN (Vehicle Identification Number) Check:
* Location: The VIN is typically found on the driver's side dashboard, near the windshield.
* Decoding: The eighth digit of the VIN will tell you the transmission type:
* "1" - 4L60E (Automatic)
* "4" - 700R4 (Automatic)
* "5" - 5-Speed Manual (GM465)
* "6" - 4-Speed Manual (SM465)
2. Transmission Identification Tag:
* Location: Look for a metal tag attached to the transmission case itself. This tag should have the transmission model number (e.g., "4L60E" or "700R4").
3. Under the Hood:
* Automatic: If you see a dipstick for the transmission fluid that says "ATF" (Automatic Transmission Fluid), you have an automatic transmission.
* Manual: If you see a clutch pedal and shifter, it's a manual transmission.
4. Online Resources:
* Vehicle History Report: Services like Carfax or AutoCheck often have details about the transmission.
* Chevrolet Parts Catalogs: Websites like the GM parts website might have information specific to your year and model.
Common Transmission Options:
* 4L60E (Automatic): A robust and popular automatic transmission.
* 700R4 (Automatic): A slightly older automatic transmission, known for its durability.
* GM465 (5-Speed Manual): A strong manual transmission.
* SM465 (4-Speed Manual): An older manual transmission, commonly found in heavier-duty trucks.
Important Notes:
* If you're unsure, it's best to consult a mechanic who can inspect the vehicle.
* Be aware that previous owners may have swapped transmissions, so these methods aren't foolproof.
Let me know if you have any further questions about your 1991 Chevy K1500!
