Hi guys. I have recently taken my front wheels and calipers off of my M880. I need one new front rotor and brake pads for both sides. I have found the parts I need, but the parts dealer asked if the Dana 44 on my truck is a 3500 or a 4500. Apparently whether the axle is a 3500 or a 4500 makes a difference in the parts. I know this is a 1 1/4 ton truck, so I am going to guess that it is probably a Dana 44 4500. Thanks.