* TH350 3-speed automatic: This was a very popular choice across various engine options.
* TH400 3-speed automatic: Used in some higher-performance or heavier-duty trucks.
* SM465 4-speed manual: A common manual transmission option.
* NV4500 5-speed manual: Less common in '85, more likely to be found in later years or heavier duty trucks.
To know for sure which transmission was in *a specific* 1985 Silverado, you'd need to check the vehicle's documentation (owner's manual, build sheet, etc.) or look at the transmission itself (usually stamped with identifying numbers).
