I have seen a "010" block in both 2 bolt main and 4 bolt main. Your truck would have a TH350 transmission in it from the factory. I think that the 3/4 ton and bigger pick-ups could be built with a TH400 transmission. Some of the more "basic" 3/4's did come with only a TH350. The only lighter trucks that did come with the TH400 were equipped with a big block motor.