Originally Posted by Johnhav430

How about the rear diff and transfer case on your car....my uncle said we can DIY those on my wife's GM since we have a lift and the vehicle should be level (people on the 3rd gen LS forum seem to be ok with breaking this rule as they often use ramps). I know the general rule is to make sure you can open the fill plug prior to opening the drain plug, and her rear diff plugs looked awfully rusty at 74k. I think these things are 100k items, not positive. 90k is the rear diff on the LS430...oil is cheap...