Fairey Overdrive A little trip to the dump 3 miles away turned into an adventure as all drive in the lanny disappeared after clattering a sleeping policeman. After a tow home the googling began and off came the overdrive unit I had fitted to find that the clutch sleeve and main shaft had ground each other away. The gearbox was so short of EP90 that I assumed a lack of lubrication pure and simple. However there is a magic ingredient anti-scuffing paste Autoparts Spur type overdrives developed to bolt onto the back of a land Rover transfer case in the sixties are not up to the job of modern service expectations. In fact that goes for any oily bits in a Series Land Rover. The only way to maintain reliability is to physically check levels in both axles and all gearboxes gearbox My first car was a Zephyr MKII Farnham Estate with overdrive and that kept going when top gear croaked. Remembering how to engage the overdrive on that car wasn't straight-forward as you had to be travelling at or about 20mph on overrun and pull on a chromed knob that operated a dog-clutch. There was no engine braking due to the built in freewheel. Roamer(Rover)drive-epi-cyclic alternative is big money. Parts required to renovate Fairey Overdrive Parts to fit to prevent EP90 dripping out and maintain lubrication include billet cut transfer case cover