Oct 16, 2017 - 01:52 PM
This item is not listed for the 4500's. https://www.mishimoto.com/chevy-gmc-6...
Products on the XDP website are designed, tested, and listed for mid-size diesel pick-up trucks unless otherwise noted. Many products will NOT work on E-series vans, Excursions, 4500/5500 series, F-450/550, heavy duty trucks, and motor home applications unless otherwise specified. If you have any questions about a product working for a specific application please contact us first, refunds will not be given for products installed or attempted to be install on the incorrect application. Our toll free help line is 1-888-343-7354 please call if you're unsure.