Abstract: An inadequate original equipment transmission in a right hand drive vehicle, for example a postal vehicle, is replaced with a more suitable transmission designed for a left hand drive vehicle. A right-to-left change-over linkage connects the shift rod emanating from the driver's gear selector lever to the shift lever on the left side of the replacement transmission. A kit containing necessary parts for replacing the transmission is disclosed. Also disclosed is a step-by-step operational procedure for carrying out the transmission replacement.