* 4L60E: A four-speed automatic transmission. This was very common in this model year and engine lineup.
* SM465: A four-speed manual transmission. Less common than the automatic but certainly possible.
To know for sure which transmission is in *your* specific 1995 Chevy Z71, you need to check:
* The vehicle's documentation: Your owner's manual or other paperwork should specify the transmission type.
* The VIN number: A dealer or online VIN decoder can reveal the transmission.
* The transmission case itself: You can find markings on the transmission case itself that identify it, but this requires some mechanical knowledge to safely access.
Without more specific information about your truck, it's impossible to say definitively.