hey since i work with trannies and i know what works and what wont i know that the opel auto and the geo tracker auto are the basically same unit cept for the bellhousing i like to go 4x4 a i love opels so i am going to look for a tracker with a bad engine and swap in a 1.9 be i good swap i believe plenty of power from the opel or at least potential wow just think the first 4x4 opel