Description: 

New Input Shaft/4th Gear (10Spl. / 23T) 

Notes: 

This Part fits all of the following Tremec TR-3650 Transmission Models:

-TCET1265, TCET1789, TCET1868, TCET1858, TCET1921, TCET1903, TCET1925, TCET2018, TCET2090, TCET2115, TCET1986, , TCET5757, TCET2197, TCET4783, TCET5849

Transmission Model Numbers are found on Aluminum Tags bolted to the Tailshaft Housing. If your Model Number = One of the above Model Numbers, this part is correct for your application.