I dont have a Toy mini truck but I did have a 350 with a 350 Tranny in an S-10 with Toy axles. They held up fine under hard abuse with a 36 inch tire. As far as the Toy tranny and T- case.... I have no clue. Now I still have the 350 but with a built to the hilt 700R and a 205 doubler and a D-60 out back. I still have the Toy axle up front and expect it to be fine if I drive it right... (most of the time).