I just stumbled across this forum...and this thread, but.....I'm just finishing up replacing the rear subframe on our 2004 XR awd. If anybody is curious, it' not that bad of a job. I'm just a shade tree mechanic and so far it's been do-able. Like the OP said, there is not much online help. I've spent somewhere between $1500-$2000 I think. Mine was just a big ball of rust. I came here looking for some exhaust info.