Re: rear gear oil
Well the fuilds have been added and I have noticed a little bit smoother ride and a little better gas mileage. Also with all of the fluids that I swapped(fresh syn oil, new syn tranny fluid and diff oil) she seems a little quicker also. I was running Mobil 1 syn before but I tried the Royal Purple this time as well I haven't noticed and diference in the egine from one syn to another syn. Hope that this helps. I did add a bottle of the GM Posi Additive to both diffs. The transfer case fluid comes later this week.