Rear Differential

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Jan 19, 2011 | 08:01 AM

spstgermain

Thread Starter

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Joined: May 2010

Posts: 57

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Rear Differential

Getting ready to do rear differential fluid and transfer case fluid changeout.

1 Can anyone tell me how I can tell if I have Limited Slip or not from the sticker on the truck. Need to know for the limited slip additive.

2 What fluid do you recommend for this??

Thanks for your help!!!

Jan 19, 2011 | 09:39 AM

cmalinowski

Junior User

Joined: Dec 2010

Posts: 58

Likes: 0

From: Columbia, MD

Quote:

Originally Posted by spstgermain

I used this

There is probably another one on this site, maybe in the tech docs, but I am not feeling well and don't feel like searching.

EDIT: use the tech folder version. It's much better. Apparently I felt like searching

Chris

Jan 19, 2011 | 09:42 AM

cartmanea

Lead Driver

Joined: Jun 2007

Posts: 6,757

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From: Corvallis, OR

Use a good synthetic 75w-140, like Amsoil Severe Gear or Mobil 1, and you won't need any LS additive.

Jan 19, 2011 | 10:59 AM

krewat

FTE Leadership Emeritus

Joined: Jul 2002

Posts: 42,561

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From: Long Island USA

Quote:

Originally Posted by cartmanea

Use a good synthetic 75w-140, like Amsoil Severe Gear or Mobil 1, and you won't need any LS additive.

I used Mobil 1, and I sure DID need an LS additive with it - it chattered like a spider monkey.

Jan 19, 2011 | 11:21 AM

redford

FTE Leadership Emeritus

Joined: Sep 2000

Posts: 23,174

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From: Stephensville WI

What is the axle code on your door sticker? If the code has an L or sometimes an N it is limited slip.

37- 3.73

3L- 3.73 LS

41- 4.10

4N- 4.10 LS

43- 4.30

4L- 4.30 LS

48- 4.88

8L- 4.88 LS

53- 5.38

5L- 5.38 LS

Jan 19, 2011 | 12:41 PM

mikesmayhem

Senior User

Joined: Feb 2009

Posts: 320

Likes: 2

From: Stacy, MN

I used the AMSOIL. Did not need the additive and the LS works fine. (or at least as well as the Ford LS can work).

Jan 19, 2011 | 04:36 PM

SuperDutyScaler

Lead Driver

Joined: Nov 2008

Posts: 8,450

Likes: 70

From: South Jersey

75w 140 mobil one, and i didnt add ls additive. works ok no chatter at all. and i used mobil 1 atf fluid when i did my transfer case. its crazy how dirty it was at 70k!