I bought my 03 in May of 04. I did not trust the RE48 yet and got the six speed manual. I have heard (hear say) that the RE48 can handle the torque and pull the load but agree with Tiffensdad that hot rod starts under load is not smart.
Suggest you check out some of the Dodge forums they will give you straight scoop on the RE48 transmission. You did not say if it was a Calf or HO 305 engine.