My 87 4wd auto LE had never leaked more that a few drops of oil, but after a couple of recent trips that included long stretches on gravel, I noticed a puddle of oil underneath. On close inspection, I found that the rear portion of the oil pan was badly corroded and, after cleaning it up, found three places where oil was leaking. It seems, although I have not yet confirmed, that I can get a new oil pan through a local Toyota dealer. My question is what is the process for removing and replacing it. Looks to me like you might have to pull the engine. Anyone done this?