Hydra-matic 4L30-E Transmission Workshop Manual written in English. This manual contains the general description and procedures necessary to repair, overhaul, or service the Hydra-matic 4L30-E transmission currently found in the Opel Omega, Opel Senator, BMW, and Isuzu Trooper/Rodeo. This transmission is a fully electronically controlled, 4-speed rear-wheel drive unit.