Will S20 transmission fit a D15?
The S20 transmission will not fit a D15 engine without modifications. The S20 transmission is designed to be used with the B-series engines, such as the B16, B18, and B20. The D15 engine is a D-series engine, and it has a different bellhousing pattern than the B-series engines. In order to install an S20 transmission on a D15 engine, you will need to use an adapter plate or have the bellhousing of the S20 transmission modified to match the bellhousing pattern of the D15 engine.