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Old Nov 8, 2008 | 09:33 PM
  #1  
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Oil Capacity

Any one know the capacity of my rear differential? Is 80-90 weight Royal Purple ok?
 
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Old Nov 9, 2008 | 04:12 AM
  #2  
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i think it is just shy of 4 qts. i think....
 
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Old Nov 9, 2008 | 07:20 AM
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Yep, 4 quarts should do it. My rear diff has a tag with 75w140 Syn on it. ($15/Qt)
Some guys use 80w90 but I don't know for sure if it's OK. I try to follow the factory
recommendations.
 
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Old Nov 9, 2008 | 08:35 AM
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Originally Posted by Cuda_jim
Yep, 4 quarts should do it. My rear diff has a tag with 75w140 Syn on it. ($15/Qt)
Some guys use 80w90 but I don't know for sure if it's OK. I try to follow the factory
recommendations.
I came across the same information saying to use 75w140 when I was trying to find the capacity. The Ford Diesel Supplemental manual also says to use a friction modifier. Ever hear of this stuff?
 
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Old Nov 9, 2008 | 08:41 AM
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Originally Posted by scatgo
I came across the same information saying to use 75w140 when I was trying to find the capacity. The Ford Diesel Supplemental manual also says to use a friction modifier. Ever hear of this stuff?
If you have a LS use a friction modifier...if you are going to Royal Purple you do not need it.....as well with most synthetics you will not need the modifier
 
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Old Nov 9, 2008 | 09:03 AM
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Most synthetics have friction modifier like Ron said but they usually do not contain
enough IMO. I add an additional 8 ozs. You can get it atmost auto part stores.
There are some here that do not use the modifier at all, it makes the clutches a nosier
and may wear out a sooner but the LS will grab sooner and hold on longer. If you are
off-roading a lot then leave it out.
 
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Old Nov 9, 2008 | 11:20 AM
  #7  
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Thanks. Tried to rep you all but have to spread the wealth.
 
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Old Nov 9, 2008 | 04:48 PM
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watch out, motor craft friction modifier smells absolutly horrible. and it is a hard smell to get off you....and out of your nose.....
 
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Old Nov 9, 2008 | 05:06 PM
  #9  
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Thanks for the warning!
 
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Old Nov 9, 2008 | 07:11 PM
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Originally Posted by immastrokinnow
watch out, motor craft friction modifier smells absolutly horrible. and it is a hard smell to get off you....and out of your nose.....
That stuff is nasty! it will stink up the shop for a week! Get it on your boots and your shoes need to come off outside before you get home!
 
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Old Nov 9, 2008 | 09:11 PM
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ummmmm...in your nose.....you arent supposed to sniff it....lol
 
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Old Nov 10, 2008 | 01:38 AM
  #12  
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you dont have to sniff it to get that smell in your nose, you just have to be near an open container...
 
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