* TH700-R4: This was a common 3-speed automatic transmission.
* SM465: This was a 4-speed manual transmission.
* TH350: A 3-speed automatic, though less common than the TH700-R4 in 1986.
To know for sure what transmission is in *a specific* 1986 Chevy Blazer, you'd need to check the vehicle's identification number (VIN) or look under the vehicle at the transmission itself. The VIN can be decoded to reveal the original transmission.
