I've just bought at 1981 244 GL (manual) that has overdrive, but the overdrive (electronic I believe) drops out regularly back to fourth gear. It also does not go in immediately or always when the button for uverdrive (right in the top of the gear stick) is pressed. Havig only driven it once I found that it would sometimes hold more is speed was lower (90 kms hr or less) and decelerating, or if under costant acceleration. Howver there in the end seemed no mathod in the madness to keep the overdrive from 'slipping out'; it was also a litl;e clunky going into overdrive.
I also may have to get engine mounts due engine vibration; is there anywhere cheap near Newcastle / Sydney to do this (or buy just parts)? The 244 has a rough feeling move off from a standing start - normal (clutch vibration) but this is exaccerbated by loose engine mount. With thanks for any help; David