I bought the truck last summer (93 f150 5.0 AOD tranny) ext cab 2wd. I had the transmission rebuilt that seems to be ok. I have a nasty oil leak I need to fix just keep putting it off.. but here's the real question. I have 163K on her and not sure when the last time she had her Differential fluid changed. Do I go with the old saying if it aint broke dont fix it or should I just go ahead and change it out? thanks.

scott