I just looked at rock auto, they list the same pumps for c1500 7.4 as c3500 and P30. I know the c1500 doesn't have hydroboost but the other 2 do. 1 size fits all is bs. I looked at Kodiak and no listed for any of the 3 engine choices.
Your return lines T together then enter pump ?
Your return lines T together then enter pump ?