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  #1  
Old 09-08-2017, 11:16 PM
MaDMaXX MaDMaXX is offline
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Default 80W90 Gear oil a little thin on the ground?

So the rear diff takes 80w90, for some reason i thought it took 75w90, which there is good choice in oils.

80w90 on the other hand, really can't find much I was after a regular synthetic gear oil, nothing like Royal Purple.
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Old 09-09-2017, 02:03 AM
EaOutlaw1969 EaOutlaw1969 is offline
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Default Re: 80W90 Gear oil a little thin on the ground?

This is what I found on Alldata DIY

Differential Fluid Type

Front Axle SAE 80W-90 Thermally Stable 4x4 Axle Lubricant

Rear Axle 7.5 / 8.8 Inch SAE 80W-90 Premium Rear Axle Lubricant

8.8 Inch High Torque SAE 75-W140 Synthetic Rear Axle Lubricant

The high torque I guess they mean Limited slip

For my 7.5 I purchased the OEM fluid from Amazon mainly because I was ordering many other parts at the same time and I was too lazy to create another order to Amsoil

https://www.amazon.com/Genuine-Ford-...80+90+gear+oil


Here is what your looking for ( Amsoil makes great products )

http://www.amsoil.com/shop/by-produc...-90-gear-lube/
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Last edited by EaOutlaw1969; 09-09-2017 at 02:06 AM.
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Old 09-09-2017, 04:00 AM
CalebJ CalebJ is offline
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Default Re: 80W90 Gear oil a little thin on the ground?

You can run 75/90 with no worries at all. Most rangers have been using that weight for years. The only difference is that 75 flows slightly better at cold temperatures.
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Old 09-09-2017, 08:19 AM
Garfield Garfield is offline
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Default Re: 80W90 Gear oil a little thin on the ground?

80 90 should be easy to find. I got the motorcraft stuff but it is commonly available.
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Old 09-09-2017, 04:14 PM
MaDMaXX MaDMaXX is offline
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Default Re: 80W90 Gear oil a little thin on the ground?

I'm thinking maybe I do go 75w90, I don't see what issues having it thinner when cold could cause in the rear end.
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Old 09-10-2017, 08:53 AM
Garfield Garfield is offline
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Default Re: 80W90 Gear oil a little thin on the ground?

I live in Canada and have never had any problems with 80w90 in the rear even on our ice cold -40 celsius winter days. I wouldn't stray from the recommended specs personally.
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Old 09-10-2017, 09:19 AM
MaDMaXX MaDMaXX is offline
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Default Re: 80W90 Gear oil a little thin on the ground?

The only reason I can think of for 80w90 would be to keep the life in mineral oil. Expanding the gap between hit and cold viscosity requires more 'things' that I can't remember the name of at the moment, but essentially it's needs to be more synthetic.

Someone please tell me another reason not to drop the cold viscosity?
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Old 09-10-2017, 10:59 AM
dvrich dvrich is offline
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Default Re: 80W90 Gear oil a little thin on the ground?

Quote:
Originally Posted by MaDMaXX View Post
So the rear diff takes 80w90, for some reason i thought it took 75w90, which there is good choice in oils.

80w90 on the other hand, really can't find much I was after a regular synthetic gear oil, nothing like Royal Purple.

There isn't much difference at all between 75/90 and 80/90 so use either one.
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Old 09-10-2017, 07:00 PM
CalebJ CalebJ is offline
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Default Re: 80W90 Gear oil a little thin on the ground?

Yep. Much ado about nothing.
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