I Just got back from my yearly 1500 klm round trip to the Cape (Laura). Towed my soft floor camper up and back. Car and roamer drive performed faultlessly . Sitting in 4th gear over drive cruised at 95 kph. Overdrive temp maxed out at 90c well within recommended specs . Will fit r380 oil cooler when i get around to it. Only issue i had was the dreaded crack in the brake booster. Driving down the Kuranda range my right leg was like Arnies biceps'. All fixed now. I highly recommend the overdrive. Baz