how long have you had your jeep?

at places like jiffy lube and some others im sure they have pumps that suck out the old gear oil. what doesnt make sense to me is that the front would have been changed and not the back, as you said the rear diff oil was much grayer.

the only thing i can think of here is that you have a little more wearing in the rear end for some reason, it is used much more than the front end but unless you have hubs or something like command track they should be fairly close to the same color.

as for the fluid levels.

is it lifted?

my brother had a 76 GMC Jimmy with 12 inches of lift and because of the pinion angles we had to overfill the diffs (according to the checkplug, not the specs) to get the proper fluid levels in them.

the unused bolt holes may be due to a manufacturing process at the factory or some sort of jig they use to drill other holes or something like that. i dont believe that they have changed the diff covers at all..


i personally dont know how often to change the fluids in the front and rear diffs and the transfer case but as much as i like to go offroad and use 4wd. i change them more often than is called for by far because i know im using old equipment and i want to keep it in tip top shape. and i always change the transfer case at the same time i do the front and rear diffs. and if the tranny is manual i would do that too.


Wing Nut : 2 cents