I've installed a 1HD-T engine to my HZJ77 cruiser, replacing the stock 1HZ. I've left the original A440F transmission in as it bolted right up to the 1HD-T, but it keeps failing after extended driving. I keep the vehicle under 120kph, typically around 100kph max on Freeway yet it is now leaking fluid. Any thoughts? Do I need a different transmission for the 1HD-T? Do I need a transmission cooler? Thanks for any assistance.
John
John