I would use the Mobil 1 full synthetic.theGerman said:I though so too no modifier needed in the AAM axel,
so Mobil 1 or RP is good enough?
I use Mobil-1 GL5 75w-90 in mine because it's readily available at Advance Discount Autoparts where I buy and drop off my used oils. No additive needed with the 10.5 or 11.5 AAM.Leviathan said:The Anti-Spin in the 2500/3500 series trucks uses the gear type limited slip and it does not use the friction modifier. Any full synthetic lube, that meets DC's specs of course, will work. I am using Amsoil since that is what my gear installer recommended when I went to the 4.56 gears and it has worked just fine, it was also alot less expensive than the MOPAR stuff.
the only time you would need the pinion factor changed in the PCM is when you change tire sizes not gears. I use Mobil-1 as well in my 1500 but I have to add the additive.HemiRoy said:I use Mobil-1 GL5 75w-90 in mine because it's readily available at Advance Discount Autoparts where I buy and drop off my used oils. No additive needed with the 10.5 or 11.5 AAM.
What did it cost to have your 4.56 gears installed in your 2500? I've been considering it for my 4X2 for towing our 5th wheel. Did you have to have the pinion factor changed in the PCM for cruise control and expected rpm? Any new vibrations or gear noise? My truck runs so good I hate to open a can of worms with it.