I’d like to replace these lines on my Cummins QSB 5.9 engines. These are transmission cooler lines? What’s running through them, oil or water? Can’t seem to find stock parts for these. Has anyone replaced them?
They are the lines that carry the transmission oil from the gear tot he cooler and back. They are low pressure lines but are probably double wall braided lines. You will have better luck just going to a local shop that makes hydraulic hoses and have new ones made..........however, the problem may be getting bronze or stainless fittings locally.