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Differential fluid weights?

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Old Jan 7, 2008 | 02:55 AM
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From: Glen Burnie
Question Differential fluid weights?
I have a 97 f-250 4x4 7.3l manual. I want to change my front and rear diff fluids but I dont know what weight gear oil I should use.
 
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Old Jan 7, 2008 | 05:25 AM
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75w140 synthetic in the rear diff, add friction modifier even though the fluid comes with it if you have limited slip.

80w90 in the front.
 
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Old Jan 7, 2008 | 05:28 AM
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From: Glen Burnie
Thanks for the info. Has anyone used the lucas gear oil? I love all their other products
 
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Old Jan 7, 2008 | 09:37 AM
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at 24 dollars a quart. i think i'd use the valvo Synth 75w140 for 6 a qt.
 
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Old Jan 7, 2008 | 02:21 PM
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Originally Posted by Acewelder99
Thanks for the info. Has anyone used the lucas gear oil? I love all their other products
I used to think that too...until I read/saw this
http://www.bobistheoilguy.com/images/lucas/lucas.htm

Lucas fuel injector cleaned is good stuff though, but I've not used it in our diesels...don't know?
 
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Old Sep 2, 2010 | 10:20 AM
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how many quarts does the reaf diff. take?
 
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Old Sep 2, 2010 | 11:26 AM
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Three to three and a half quarts so you will need four.
 
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Old Sep 2, 2010 | 12:15 PM
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Thanks pete!

pete
 
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