Definitely a D70, it's an obscure detail to know but the lower "jaw" of the inner knuckles are a little thicker than a typical D60. That plus the u-bolts, crossover and such point to a conversion truck. Lots of unusual stuff on it, Funky bump stops on the front and the sectioned frame in the rear. It's seen it's fair share of work too, it's still in 4Lo.