I use the Amsoil, too. Grey Permatex for a gasket. Be sure to wipe out as much old lube as possible and fish around with a magnet.

 

ok so let me get this straight should i or should i not use synthetic on the rear with the LSD? and should i or should i not add a friction modifier? then for the front i can use whatever right?

 

Royal Purple is sold at Oreilly's.

 

ansoil only no slip additive

 

X2. Amsoil, and don't add anything else

 

sweet. well ill look for the amsoil then. thanks guys.

 

Don't add unless needed due to chatter in turns. Front can use 80w-90 (4 Qts).... or same Amsoil stuff. Dana 80 - 5 qts.

RJ

 

I used Castrol Synthetic 75w90 in both the front and rear. Also added the friction modifier and the limited slip works just fine...

 

ya i dont have any chatter at all in turns. but the truck usually only likes to spin one tire...

 

Take a look at the comparisons between all of the gear oils, and make your own decision. You won't be using purple, redline, torco... Amsoil severe gear rated #1, Mobil 1 rated #2... I use Mobil 1, cause I get a little better mileage (thinner) than with Amsoil, but I'm basically stock w/ an Edge box. If I had more power, I'd probably run the Amsoil.

 

Rated by whom? Based on what criteria?
If the Amsoil and the Mobil I are the same visosity...they are, by definition, the same thickness!

RJ

 

With a post like this you need to provide your source as your comment holds no validity without it!

Joe

 

Whichever fluid you choose to use, double check with your owners manual as to the fill level. I think the spec is for the rear, 0.75" BELOW the fill hole + - 0.25". The front is 0.50" + - 0.25" below the fill hole. Over filling can cause oil to leak through the wheel seals until the proper level is reached.

 

RJ
Based on an independant study performed by Dave E Leitten and Kevin L Dinwittie, using ASTM (American Society of Testing and Materials), and SAE (Society of Automotive engineers) using Federal Test Method Standards. Yes, after the tests were completed, Amsoil used the results to market their product. I don't sell or use Amsoil.

All Oils are required to fit into a viscosity range, and the facts are the Amsoil
(16.68cSt) IS thicker than other brands within that range (M1-14.24 cSt). There are also degradations that occur with use, which is why we all change our fluids. Those degradations cause the additive packages to break down, thusly decreasing the viscosity further.

I tried to post the article so you could draw your own conclusions, but apparently it isn't opening. Feel free to read the study. http://www.performanceoiltechnology....te%20Paper.pdf

The tests showed 14 different gear lubes being tested, and is quite informative. It sure beats the "run this stuff, cause I do" posts that are all too familiar here.

 

Impressive findings. Extensive testing.
Have always know Amsoil was above average.

It gets interesting when you talk to Differential rebuilders. Particularly on high end stuff.... Race Cars, Corvettes, Vipers, Ferrari, etc. What they see on tear downs, after strenous use, is somewhat different from these laboratory test results!
Yes, Amsoil does well and does not fall flat on it's face with these vehicles. We could all do well using Amsoil in our CTD's.
But I have a few customers that deal exclusively with these high performance vehicles and they do not all rave about Amsoil. They have all tested it, in hands on enviornment, and do not all use Amsoil..... prefering other high grade brands.

Please hear me. Amsoils Severe 75w-90 is good stuff. But there are reasons it is not the ONLY one. Just one small example is....for racers like myself, that change diff. fluid every 10 - 20,000 miles, I believe, and have proven to myself on teardows, there better protection out there at a lower price. I could get into 4-5 other examples but....lets not.
All-JMO

RJ