Originally Posted by exriguy
So just hit 38k and due for a service is there any updated thinking on diff changes? This is a 14 Overland and was going to do rear diff this change and fronts next. I never take it off road and get no snow here -- real light duty housewife stuff. Thanks!
here is the scoop.
Your diffs and t-case shed a lot of metal during the first 5-10K miles. Amsoil had an old white paper where they did testing, and oil analysis. They had a conttol group they didnt change the gear oil and a couple test groups where they changed the gear oil early at 5K and 20K and then sample them all at 50 K and then 100K.
the control group had a lot of iron and what not flaoting around, very high ppm count.
My self on all my cars and trucks, I dump the fluids early and refill with synthetic.
On WK2 it is very easy since the diffs have a fill plug and drain plug, not the older covers to remove/clean up and reseal.
I hammered my jeep the 1st 100 miles to seat the rings. I drained all the fluids except the trans. I changed the gear oils and t-case again at 1500 mils,
In both cases there was a lot of pearl in the fluids I drained out, so I know it is a wise thing to do, since you dont want the metals floating around. I plan to dump them again next spring. Hopefully by then they t-case and diffs will be fully broken in and at the point I can extend the drain intervals to 36K to protect my warranty,I have the lifetime maxcare.
see attached pics, shows gear oil and trans fluid from t-case, lots of silver pearl floating aroung in the "soup", do you really want that crap in your diff?
I can change the fluid in about 15 min with a outboard lower drive pump which threads onto a qt bottle. By some 75w-90 GL5 synthetic or if you choose the Mopar 75w-85 fluid. I used Redline sinceI have 5 gallon pale of it.