Transmission Troubles 87\' Suburban My 400 automatic trans out of an 87' Suburban 4x4 will not shift out of first gear. I have changed the vacuum modulator and had a trans shop look at the governor.(He said it was good. The teeth are still in good shape, could it still be bad?)(I dont really trust the trans shop) Does anyone have any other suggestions before I replace it? If not, Will a 350trans out of a 75' Blazer be a direct bolt in as a replacement?