I assumed the 3500HD is one with an I-beam axle and 10 lug wheels, back when HD meant something. Seems everything now days is HD or Super Duty...
You may use the spring pads off the original axle as it, the Dana 80, and 70HD all have 4" axle tubes.
it is a 3500 h.d. with 10 lug 19.5 wheels. thanks for your help.
