Ok, i dont know if this is an old topic or whatnot but at this point it really doesnt even matter right now because its a new area and learning experience for me. Besides im really getting frustrated and have been sitting in front of my computer for damn near 3 hours trying to research this crap for myself. Anyway, so i now have in my possession a Detroit TruTrac Gear Type LSD. Now, been racking my brain and eyes, trying to find the correct oil for it. Not too mention a few Redbulls and Mt Dew, and the bubble guts from dinner my wife cooked..lol...i know TMI. Ok, so Eaton is the MFG, and i called them and spoke to a rep and he say's 80w-140. Synthetic w/ no friction modifier. Now on there website, they advise against using synthetic's and say non synthetic and because the Diff is gear driven friction modifier is not to be used. Huh? alittle confusing already. Either i do or I dont. this is coming from the same company. Im too tired to call back and see if i will get patched into a different rep and get different information. Ive searched various forums and various articles pertaining to this subject and whats crazy is that there are too many alternatives applying to this very same scenario. From Dodge vehicles, Mustangs, Chevy cars and trucks. All with the same Differential setup but not close to common solution. Ive gotten 80w-90 to even 90w-140. You know as far as trying to find a manufacturer of a non-synthetic/ petroleum/ mineral based oil ive pretty much end up back on the forum as if im traveling in circles. Its almost as if such a thing doesnt even exist. Yet this is what i am being advised to use. Even on the Royal Purple website the fluid they advertise is synthetic based. Perhaps in my google searches my terminology or wording have been incorrect thus i am unable to get results but with even googleing " non synthetic differential fluid/oil. every single result that came back was either a page or product relating to a synthetic based product. So long story short and its dan near 0100 here, if anyone has a viable solution, relative experience, or has run a synthetic in a similar differential please feel free to chime in. I just dont want to mess up my car and parts trying to get this to work. i will glady share what information to the next person that encounters similar problems to where i may be able to help or share information and/or experience. Well guess im done venting....lol....
Actually, between my customers and myself, we have used every available fluid known to man.
Originally Posted by xmasbby78
We started years ago with only Lucas 85-140 NON-synthetic fluid.
About a year or so ago (when I switched over to Ford Racing gears) we all started switching to pure synthetic, EXCEPT AJ lol who did it perfectly the old school method....non-synthetic for the 1st 500 miles or so, drain it out, pour in synthetic from there on.
So in answer to your question, I can't see a bit of difference in noise, wear, in the fluids, however, for the 8.8's that have a couple of years on them, stick with the Lucas Non-synthetic.
How about some photos of the new diff????
PS...NO MORE RED BULL!
Ok, thx bill. Well ill head back in the shop tommorow and take some pics and i'll post them tommorow.