Sorry to start ANOTHER thread

[apeas2]

I am a little confused. I have a 19 Rubi unlimited with the factory Trailer tow package. We do not tow and am planning on changing both diff fluids. Did it come from the factory with 75W85 or 75W140 because it has the tow package? Just trying to figure out what to put back in. Thanks!!!!

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[Rhinebeck01]

I am a little confused. I have a 19 Rubi unlimited with the factory Trailer tow package. We do not tow and am planning on changing both diff fluids. Did it come from the factory with 75W85 or 75W140 because it has the tow package? Just trying to figure out what to put back in. Thanks!!!!

@apeas2

Regardless of whether you tow or not, DO, put in the recommended weight fluids for the given differential.

This is what many here use (me to) for their Rubi's:

You do not need any additional additives..
Dana 44, M210 (Front) 1.2 qts. Royal Purple 75w90 Syn. Gear Oil
Dana 44 M220 (Rear) 1.5 qts. Royal Purple 75w140 Syn.Gear Oil

What you do is buy 1 quart of the 75W90 and two quarts of the 75w140. Now, do your rear diff first with the 75w140 and you will have some fluid left over. Now, do your front with the 1 quart of 75w90 and since you will be a tad short of fluid, use the left over 75w140 to fill the diff, till it drips out. Per Royal Purple, there is absolutely no reason you cannot mix the two product weights together. I spoke with their rep on the phone..

You do as I suggest, buying only 3 quarts cause it saves you lots of $, you will have no left over lying around and because it is ok to do so.

Hint: Be sure when you do your diffs (easy to do) to always loosen the fill plug before you drain the diff using the diff drain plug.

Look at each link
https://www.amazon.com/gp/product/B000J15THO/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B0007QGT34/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1