05's are 610 at least what I am reading here and in other publishings. They beacme 610's after GM listed their DMAX Diesel at 605. I want to say the 05 Rams built after June or July (not sure ) became 610's. But if you were to order a truck today it would be a 610"s.
05 3500 4X4 laramie DRW 325/610 6 spd 4:10's built Sept 04 came in on 10/30/04
Sold 99 3500 4X4 DRW ATS transw/ VB,TC,Comander edge,AFE Auto Meter and a 53 block :{ that why shes gone.