Best Gear Oil for rear and front Diff - Ford Powerstroke Diesel Forum
Non-Powerstroke General Discussion General Discussion for 6.9L and 7.3L IDI (Non-Powerstroke) Engines

 
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post #1 of 5 Old 07-21-2010, 08:13 PM Thread Starter
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Best Gear Oil for rear and front Diff

whats the best brand mobile/ Valoline. ect any suggestions would be good also what weight is recommened there are several diffrent weights and i Would just look in the manuel if i had one lol any help would be awsome...



1994 F350 all stock 7.3L non turbo idi with High Miles
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post #2 of 5 Old 07-21-2010, 09:09 PM
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Not going to touch on the brand debate but I personally run synthetic in everything but the engine.......

75-90 front and rear (if you dont pull)
75-140 rear (if you often pull loads)

Personally, I ran 75-140 in mine all the time and it was a daily driver that got pulled with just a few times a year.

Also, if you have a limited slip rear diff you need to add friction modifier.....

Thad


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2003 F350 6.0 4x4 Crewcab Longbed SRW w/X Code Front Springs- 265/75R16's on it now. Still got the 285 retreads in the shed though.
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post #3 of 5 Old 07-22-2010, 05:08 AM Thread Starter
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is the any diffrencence between 75w and 80w and do they make the gear oils with the limited slip additive in them or is it a seperate bottle to add as well? Thanks thad
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post #4 of 5 Old 07-22-2010, 05:46 AM
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Not to preach but Amsoil severs gear lube is the best deal for the money i use it with revx good for 50000 severe use 100000 non severe
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post #5 of 5 Old 07-22-2010, 08:55 PM
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Not sure what you mean if there is a difference between 75W and 85W? Obvisouly, they are two different oils but whether it really matters to the differential.....I wouldn't think so.

Yeah, some have the LS additive in them. Just make sure you read the container.

Thad


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2003 F350 6.0 4x4 Crewcab Longbed SRW w/X Code Front Springs- 265/75R16's on it now. Still got the 285 retreads in the shed though.
Future modifications: Edge Insight CS, SCT X3 with Custom Tunes

-SOLD-
1994 F350 7.3 Banks Turbo IDI 4x4 Crewcab Longbed-Miss you old girl
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