1985 D150 "Mr. Curtis" race truck with a 2015 6.4

Buschi340 said
is such an SRT axle ( charger / challi ) comparable with a 8 3/4 for instance? measures? ( i didn't know that srts have Retro leaf springs at all :)

The axle is from an SRT Ram truck, you are correct the SRT challengers and chargers do not use leafs.