You can look on the little stamped tag mounted just to the side of each differential housing (opposite to the pinion). Stamped onto the tag should be the ratio expressed both as a ratio and as the total number of teeth on both gears. If you do a search on this site, there are pics of the tag and much more info on the subject.
check on each axle, there should be a tag, just right or left of the diff. It may be hiding under dirt, paint, rust, etc. so inspect closely and hopefully at least one axle will have it.
Linear Mode
