Well the time has come. The 1990 f250 7.3 idi na 4x4 just can't really pull my 28ft travel trailer. I was in first gear on a hill to 15mph. I've learned a bunch from this from reading and I thank everyone for there help. As I don't want to see it go I just don't feel it will have the potential without putting more money into as I've spent 5k on getting it running. But I would still like to thank everyone who had made place with a lot information.