* TH700-R4: This was a very popular transmission in GM trucks of that era.
* 4L60-E: This is another common possibility, and a more modern (and often more durable) design than the TH700-R4.
To know for sure which transmission is in *your* specific 1993 Chevy 4WD truck, you need to check:
* The VIN: The Vehicle Identification Number (VIN) will contain information that can help you identify the transmission. You can use a VIN decoder online or consult a dealership.
* The truck's build sheet (if available): This would definitively identify the transmission.
* The transmission itself: Look for markings cast into the transmission case.
Checking the VIN is the easiest and most reliable method.