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Mar 3, 2009 | 02:07 PM

#31

spr1516

Senior User

Joined: Jun 2008

Posts: 162

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have any of you used royal pruple tranny an gear oil is it worth it or am i gonna run into probs i use it for oil an i love it

Mar 3, 2009 | 02:35 PM

#32

cartmanea

Lead Driver

Joined: Jun 2007

Posts: 6,757

Likes: 5

From: Corvallis, OR

You mean 75w140 right?

Mar 3, 2009 | 03:51 PM

#33

shark1979

Elder User

Joined: Mar 2009

Posts: 862

Likes: 0

From: eastern shore,MD

i used what amsoil told me to use. they told me i did not need any additve for the rear. that may have not been the reason. that is what the mechanic told me. i did not figure i would get anything if i went after amsoil i just took my lumps. as for the trans i have 2001 not sure of the number but it is not the one you have i am on the third one in this truck . the last one i had built by a local trans shop with some heavy duty upgrade so we will see what happens this will be my second summer pulling the boat with it.

Mar 3, 2009 | 04:21 PM

#34

Sooper-Doodie

Senior User

Joined: Jan 2009

Posts: 419

Likes: 1

Quote:

Originally Posted by cartmanea

You mean 75w140 right?

Corrected..... I hate it when I have multiple things going on at one time...lol

Mar 4, 2009 | 08:51 AM

#35

aaronbrace

Mountain Pass

Joined: Feb 2005

Posts: 162

Likes: 1

From: Hudson, NH

Quote:

Originally Posted by Sooper-Doodie

Amsoil will never cover that rear axle as they cannot prove it to be caused by the fluid on thier end. Thier argument would be that they didn't know if the axle was overloaded or not.

Probably true there! I would have at least called them to complain, but it sounds like the poster isn't really sure that was the cause of the problem.

Quote:

Originally Posted by Sooper-Doodie

There is no Limited Slip additive in Motorcraft 75w140. You have to add XL-3 to the fluid. Not adding this wouldn't cause ANY DAMAGE. It would just cause the limited slip differential to loose its effectiveness.

I am not a differential expert but my understanding was that the friction modifier used in the limited slip differentials was actually there to REDUCE friction and help the limited slip disengage when motion stopped etc. I believe not using the additive (or not using enough) will shorten the life of the clutches in the rear end...It won't blow up in a week or anything but it will not last as long as with.

Feel free to correct me if I am wrong as again I am not an expert.

Quote:

Originally Posted by Sooper-Doodie

He stated he had a 2001. It would have to be a 4R100 if it were an automatic.

Yah, I was referring more towards the comment that ford transmissions suck in general.

Mar 4, 2009 | 10:22 AM

#36

cartmanea

Lead Driver

Joined: Jun 2007

Posts: 6,757

Likes: 5

From: Corvallis, OR

Correct, its a common misconception, but the additive reduces friction and makes the clutches slip easier. You add it if the LS is grabbing in corners too much. If the clutches are grabbing too much it could cause a clutch disk to break, I've seen it in the TracLok differential before.

Mar 4, 2009 | 03:46 PM

#37

shark1979

Elder User

Joined: Mar 2009

Posts: 862

Likes: 0

From: eastern shore,MD

That was the problem. i had to have them replaced. it happen about six mounths after i put the amsoil in. But i am just going by what the shop told me. Iam a plumber not a wrench turner.