did these come with detriots in them? was it an option or what? did any of them come open in a base model 3/4 ton...i looked at one today and pulled the cover and im pretty sure i saw a detriot in there...its on a mid 70's model and seemed in pretty good shape..the gear oil was pretty clean and i dont think it has been changed judging by the dirt that was around the bolts...the guy wants 200 bucks for it....what do you think??? AIRBORNE!!