Discussion Starter · #1 ·
Hi. I've got a 2002 1500 5.7 automatic, 168K miles, original owner. Lately it started running rough when in gear. Vibrating a bit. When I shift it into neutral, like going down a hill, the roughness stops. My husband says it's probably transmission problem. The check engine light is on, but when I took it to AutoZone, the code is for a fan relay. The transmission fluid hasn't been changed in several years. Any idea if it is a transmission problem? I'm sure it's overdue to get the fluid changed out, which I will do. Any other ideas? Thanks.