Amsoil 75-140

[roperteacher]

I just spoke to an AMSOIL rep. He recommended the 75-140 for my trucks rear end. Plus one bottle of the limited slip additive. I have an 04. 5 3. 73 Manual trans. 4x2. I had the rear rebuilt at 2200 miles due to a whine. Now I have a smaller whine at 70 MPH... AMSOIL was recommended to probably fix this noise... just wanted a few more opinions before I placed the order. Thanks!

 

[klenger]

Dodge recommends 75W90 for the 3rd gen axles, and I understand that the limited slip additive is not required.



75W-140 and the limited slip additive were the norm for the Dana 80's on the 2nd gens.

 

[Bertram65]

75W90 as stated is reconmended. There are no clutches in the AA anti-spin therefore you do not need an additive. Gotta love oil "experts" who reconmend things and are wrong.

 

[roperteacher]

Just returned from the dealer. My Diff fluid looks fine he said after being broken in. They said lots of people are hearing the noise I describe and that it is normal. Chrysler is looking at trying to find a way so that the cab is insulated so consumers can't hear the " Normal " noise and become alarmed...

 

[Jengle]

Yup, you are dealing with a large truck axle now, and it will whine to some degree. My dad, old army guy, said it reminds him of the duece and a half or five tons, he used to drive and ride in. He thinks it's kind of comforting. Mine is not that loud and has decreased some, since new. I now have 13k on it. Just did the first change on the oil and used Amsoil 75-W90 in it, no additive, no change in noise level.

 

[DGFoster]

What is the main difference in the Dana 80 and the 11. 5 AA in the 3rd gen??

 

[jungledave]

I have no wines in my 04 from the 11. 5 Antispin. I didn't have any at 20 miles and don't have any at 5500. Either that or I can't hear it over the drone, any way no complaints. I don't agree that any oil of any chemical makeup or viscosity can mask a whine, but I could be wrong. What is up with the additive. If you are seriously pulling a lot of weight I don't think that the 140 would be a bad idea. I ran 85-140 Mobile Synthetic in my 02 and it was only as thick as the 90 that came out in fact it seemed thinner. I'm no expert though.

 

[DGFoster]

I ran the 75-140 in my Dana 80 and it was great,in fact I hast quite a lot left,I was hoping to use in in this truck. .

 

[Bertram65]

The additive is a friction modifier for the clutchs in the Dana limited slip differentials. The AA anti-spin uses gears instead of clutches and does not need it.