Mopar 9 1/4 narrowing

More than you would think, pretty common in older power wagons and power rams and even some vans. Less weight and parasitic drag than a 60, nearly unbreakable for street usage. I've picked a housing up out of a '79 Power Wagon from a junkyard once for $30 that someone else had bought the axles and brakes out of and it still had the 3.55 gears and a sure-grip in it.