I got my 2003 Rubicon re-geared over the summer and was told to replace the gear oil after about 6k miles so that was the plan this weekend. I did lots of research on the topic and felt pretty good going into this project. I did not really have any issues except I did not end up using near as much gear oil as I had anticipated. I was expecting almost 2 qts for the front and about 2 qts for the rear. The front used about 1.75 qts and the rear was about 1.5 qts so I am a little paranoid now. I have stock diff covers and filled them until the gear oil started to come out the fill hole as everyone has said to do. I guess I need a little reassurance that I am OK and not going to screw something up. I used Royal Purple 75W-140, I know that I could have stayed with the dino but I run the synthetic motor oil.
Also, I had a VERY strange thing happen after I was done with the gear oil change that has me completely freaked out. I went to back the TJ out of the garage and the front lockers were engaged (the light was flashing) but I was not in 4LO and i did NOT engage the lockers. I put the jeep in 4LO and after a bit if forward/reverse got the lockers off and things back to normal. I thought you had to be in 4LO for the lockers to be engaged and I know the switch was not hit by accident as it has NEVER happened before. Is my TJ just possessed or what?
Thanks for the help and information folks!