Differential question - Dodge Cummins Diesel Forum
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post #1 of 7 (permalink) Old 02-08-2020, 03:38 PM Thread Starter
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Differential question

Hello everyone so I have a 93w350 I want to change the diff fluid I will attach a pic of the identification tag I dont think it's a LSD so will it by ok putting a 80w90 gear oil that contains a friction modifier. also if I run 80w90 with the modifier already added to the np205 will that be ok as well I plan on using redline products

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post #2 of 7 (permalink) Old 02-08-2020, 05:31 PM
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80W90 is fine, and the NP205 will run on pretty much anything, GM ran them with ATF.

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post #3 of 7 (permalink) Old 02-08-2020, 06:26 PM Thread Starter
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Ok thanks I no the viscosity of the oils are ok but what I'm really wanting to no is the gear oil with friction modifiers already blended in from the factory are they ok to use on a diff that doesnt have a LSD or the np205. Or does the friction modifiers make it to slippery
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post #4 of 7 (permalink) Old 02-08-2020, 08:08 PM
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You’ll be fine with the modifier. Jack up the rear end and spin over the tires, if they both spin the same way, you’ve got posi

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post #5 of 7 (permalink) Old 02-08-2020, 08:34 PM Thread Starter
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Thanks bro you've answered a bunch of my questions in the past appreciate you to the [email protected]
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post #6 of 7 (permalink) Old 02-14-2020, 10:08 PM
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Quote:
Originally Posted by 702 3500 View Post
Ok thanks I no the viscosity of the oils are ok but what I'm really wanting to no is the gear oil with friction modifiers already blended in from the factory are they ok to use on a diff that doesnt have a LSD or the np205. Or does the friction modifiers make it to slippery
Friction modifier only prevents LSD clutches from chattering, you can use gear oil with friction modifier in any non-LSD application without worry.

If the truck has an LSD, and it chatters after changing fluids, you may simply need to add more modifier (available at any parts house)...I had both a D70 and a 11.5AAM that chattered on any fluid used, they both needed additional modifier.

Sent from my SM-G950U using Tapatalk
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post #7 of 7 (permalink) Old 02-15-2020, 12:13 AM Thread Starter
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Thank you sir
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