Recommended Gear Oil - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 26 (permalink) Old 04-06-2008, 12:49 AM Thread Starter
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Recommended Gear Oil

I am going to service the rear diff. Putting on an '08 cover on but wanted to see what everyone suggests for rear diff gear oil.. I see Ford specs call for 75W-90 synthetic (3.8 qts) and 8 ounces of Friction Modifier. I was considering Royal Purple and saw on thier website it comes with friction modifier in it already.. Anyone running Royal Purple or suggest something else?

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post #2 of 26 (permalink) Old 04-06-2008, 03:26 AM
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Re: Recommended Gear Oil

Get the royal purple you wont regret it.

06 F350 CC LB 4x4 with a few odds and ends
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post #3 of 26 (permalink) Old 04-06-2008, 09:17 AM
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Re: Recommended Gear Oil

im runnin royal purple 75w-140 i think yeah its good. i didnt have to add any modifier or anything. plus its supposed to be pretty good stuff


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post #4 of 26 (permalink) Old 04-06-2008, 01:12 PM
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Re: Recommended Gear Oil

I run Redline synthetic. You can get it with or without the modifier already added.

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post #5 of 26 (permalink) Old 04-06-2008, 09:12 PM
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Re: Recommended Gear Oil

Quote:
Originally Posted by Deputydog View Post
I am going to service the rear diff. Putting on an '08 cover on but wanted to see what everyone suggests for rear diff gear oil.. I see Ford specs call for 75W-90 synthetic (3.8 qts) and 8 ounces of Friction Modifier. I was considering Royal Purple and saw on thier website it comes with friction modifier in it already.. Anyone running Royal Purple or suggest something else?
recheck your manual i'm pretty sure you want 75w-140-10.50" 6.9pints
75w-90 is for the front diff. Dana 50 -3.8 pints Dana 60 5.8 pints

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post #6 of 26 (permalink) Old 04-06-2008, 09:13 PM
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Re: Recommended Gear Oil

i running mobil 1

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post #7 of 26 (permalink) Old 04-06-2008, 09:53 PM
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Re: Recommended Gear Oil

I'll be running redline.

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post #8 of 26 (permalink) Old 04-07-2008, 12:00 AM Thread Starter
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Re: Recommended Gear Oil

Quote:
Originally Posted by JHill View Post
recheck your manual i'm pretty sure you want 75w-140-10.50" 6.9pints
75w-90 is for the front diff. Dana 50 -3.8 pints Dana 60 5.8 pints
I double checked with Alldata and you are correct, 75W-140 rear 7.0 pints..

Front is 75W-90

Thanks!

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post #9 of 26 (permalink) Old 04-07-2008, 12:17 AM
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Re: Recommended Gear Oil

Quote:
Originally Posted by JHill View Post
recheck your manual i'm pretty sure you want 75w-140-10.50" 6.9pints
75w-90 is for the front diff. Dana 50 -3.8 pints Dana 60 5.8 pints
Ya I was gonna say, the rear is 75-140

Im running Royal purple..........

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post #10 of 26 (permalink) Old 04-07-2008, 12:31 AM Thread Starter
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Re: Recommended Gear Oil

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Originally Posted by Dieselboy View Post
Ya I was gonna say, the rear is 75-140

Im running Royal purple..........
Ok sounds good, did you have to add friction modifier?

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