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Noob Differential Question

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Old Mar 5, 2018 | 09:24 AM
  #1  
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jsc83
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From: Harrisburg
Noob Differential Question

I have a couple basic questions about the diff in my 67 F250 4x4. I did a search and couldn't find the answers I am looking for, but full disclosure, I'm not very good at finding things on the internet. **** keeps coming up and I get distracted.
Looking at Fordification, the code on the rear axle translates to a Dana 60 L (locking) differential. Is the "locking" the same as limited-slip?
Also, is it okay to use a 75W90 gear oil in the rear end or should I use the straight 90W? The manual calls for 90W, but I believe oil has improved over the last 50 years since the manual was printed.
Thanks in advance for the help.
Jeff
 
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Old Mar 5, 2018 | 10:44 AM
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Brian1971f100
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From: Barre Mass
I think it's the same as a limited slip. You need to use a friction modifier along with the 75w-90w.
 
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Old Mar 5, 2018 | 11:32 AM
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jsc83
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From: Harrisburg
Originally Posted by Brian1971f100
I think it's the same as a limited slip. You need to use a friction modifier along with the 75w-90w.
Brian,
Thanks for the response. Very helpful as I learn what's what on the truck.
Jeff
 
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Old Mar 5, 2018 | 12:28 PM
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NumberDummy
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1959 thru today:

If the AXLE code begins with a letter: Limited Slip / If the AXLE code begins with a number: No Limited Slip.
 
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Old Mar 5, 2018 | 01:10 PM
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jsc83
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From: Harrisburg
Originally Posted by NumberDummy
1959 thru today:

If the AXLE code begins with a letter: Limited Slip / If the AXLE code begins with a number: No Limited Slip.
That makes it pretty simple. Thanks.
 
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