rear axle gear oil weight - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 11 (permalink) Old 04-23-2011, 07:33 PM Thread Starter
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rear axle gear oil weight

I'm puttin a new diff. cover on my 97 f350.
i'm reading/hearing a mix between 75W-140 and 80W-90
idk which one it is.
anyone know?

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post #2 of 11 (permalink) Old 04-23-2011, 07:50 PM
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Re: rear axle gear oil weight

Quote:
Originally Posted by lifestroker97 View Post
I'm puttin a new diff. cover on my 97 f350.
i'm reading/hearing a mix between 75W-140 and 80W-90
idk which one it is.
anyone know?
IIRC my tag on the axle stated 75-140w and synthetic

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post #3 of 11 (permalink) Old 04-23-2011, 07:51 PM
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Re: rear axle gear oil weight

75-140 synthetic in the rear (dont forget a bottle of friction modifier if you have a limited slip)
80-90 dino is the factory oil in the front

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post #4 of 11 (permalink) Old 04-23-2011, 07:54 PM
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Re: rear axle gear oil weight

yup. 80-90 not good enough for the rear.

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post #5 of 11 (permalink) Old 04-23-2011, 08:06 PM
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Re: rear axle gear oil weight

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Originally Posted by diesel_brad View Post
IIRC my tag on the axle stated 75-140w and synthetic
Bingo...get two or three cans of brake cleaner too...get all the bs metal outta the pumpkin.

There is a tag captive to the diff cover bolts that says 75w-140 Synthetic

I know that the front calls for different stuff buuuuut I use the same in both ends...I use RP and even though their stuff isnt considered good anymore I use it because I tried one of the 'good' ones and it sucked. Made it about four months and I couldnt take the noise, clunking and performance anymore. Went back to rp and all those issues disappeared...

Fwiw, mobil 1 makes a good syn gear oil in this weight. Cheaper than RP.

2000 F250 4x4 cc/sb. 6" w/37's and some other stuff.
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post #6 of 11 (permalink) Old 04-23-2011, 08:27 PM Thread Starter
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Re: rear axle gear oil weight

thanks guys.
i think i'm gonna run AMSOIL in the rear end.
i just fixed a fuel leak earlier this morning and was checkin all the lines when i found a pin hole in the diff cover so for now it's just the rear but i'll take care of the front diff before this winter.
any other comments on brand of oil? just to get a feel for what other guys are runnin.

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post #7 of 11 (permalink) Old 04-23-2011, 08:36 PM Thread Starter
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Re: rear axle gear oil weight

how many quarts does it hold?
i'm not gettin a big name brand aftermarket cover,
it'll be close to stock.
but around 3 or 4 qts?

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post #8 of 11 (permalink) Old 04-24-2011, 02:12 AM
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Re: rear axle gear oil weight

Quote:
Originally Posted by lifestroker97 View Post
how many quarts does it hold?
i'm not gettin a big name brand aftermarket cover,
it'll be close to stock.
but around 3 or 4 qts?
a stock 08 cover makes for a nice upgrade over the stocker. its realitively inexpensive, about 60 bucks i think. you will need new hardware though its thicker

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post #9 of 11 (permalink) Old 04-24-2011, 03:05 AM
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Re: rear axle gear oil weight

Quote:
Originally Posted by lifestroker97 View Post
how many quarts does it hold?
i'm not gettin a big name brand aftermarket cover,
it'll be close to stock.
but around 3 or 4 qts?
7.5 pints including friction modifier if you have a limited slip

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post #10 of 11 (permalink) Old 04-24-2011, 04:28 AM
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Re: rear axle gear oil weight

http://www.redlineoil.com/product.aspx?pid=44&pcid=8

I used the above with 08 diff cover....

jrc

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