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Diff. Oil viscosity

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Old Dec 7, 2004 | 04:30 PM
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fortylove
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From: Silver City NM & Mesa AZ
Diff. Oil viscosity
What diff. Gear oil viscosity do you heavy haulers use? 75W90, 75w140 or 80w140. I have enough 75W90 Redline for two changes & now understand DC changed recomendation to 75W140.
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Old Dec 7, 2004 | 05:04 PM
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MikeyB
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From: Tomball, Texas
If you're not doing heavy towing the 75w-90 is fine. Heavy towing 75w-140 is preferred. I would go ahead and use up the Redline lube.

MikeyB
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Old Dec 9, 2004 | 10:17 AM
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Rattletrap1
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From: South Bay Area, CA
You can save the 75-90 for the front.

At least on my 2nd gen DC ALWAYS said 75-140 synthetic for the rear if towing heavy. Why they didn't supply it (even with factory tow pkg.) is a whole other question.
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Old Dec 10, 2004 | 12:15 AM
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Hemi Cat
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Check out the synthetic oils for the diff's. They are very good.
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Old Dec 10, 2004 | 05:08 PM
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Casey Balvert
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From: Windsor, Ontario
I am using Redline 75W140. The axle went south with the DC stuff in it about 3,000 miles ago. Never again.
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Old Dec 11, 2004 | 11:43 AM
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Bertram65
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From: MA
Is there a TSB for the 75w140 reconmendation? What is the source?
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Old Dec 12, 2004 | 07:34 AM
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roadrat
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From: ottawa ontario
75/140 tsb. 03-001-04 rev a, found at dodgeram.info

rob
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