Ford Gear (LSD) Oil

OneJSupra

I'm a sleeper ...
Feb 9, 2007
900
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Supraland
Just went to Ford to buy two qts of gear oil 75w90 and to my amazement it cost $14.00 per qt. So how much did you pay for yours? Just wondering...
 

phillipthe1st

New Member
Nov 15, 2005
22
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Raleigh
Redline at $8.95 a quart. Makes a huge difference. That is one of the first things i did to my supra and my truck. Use it for both the tranny and the differential
 

Adrian98

Banned
Dec 19, 2006
182
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orange county
$14 sounds about right, if you tell them you're a whole seller sometimes you can get it cheaper but redline makes great stuff too
 

phillipthe1st

New Member
Nov 15, 2005
22
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Raleigh
I forgot to mention Royal Purple...some people use that.

Just dont try to order any off the internet or whatever. They charge a hazardous fee and it is more expensive.
 

jdub

Official SM Expert: Motor Oil, Lubricants & Fil
SM Expert
Feb 10, 2006
10,730
1
38
Valley of the Sun
3p141592654;911041 said:
I could easily be wrong, but I think you want the Ford LSD additive, not the actual gear oil!

You actually want both...Ford 75W-90 does not have the friction modifier required for an LSD in it. (Red Line and RP does).

And yes, the Ford stuff is expensive...like most things you get at the dealer ;)
 

cuel

Supramania Contributor
Jan 8, 2007
1,536
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Baytown, Texas
NAPA now sells the exact same friction modifier as Ford. I'll try to remember to get the name of it tomorrow.
 
Sep 10, 2007
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Virginia
I just changed my diff fluid last monday, and it takes a little over 1.5 quarts.

So, buy 2 quarts of bulk 75w90 from Ford ($16/qt here), + their friction modifier (~$7), and I would suggest picking up a small hand pump from Advanced ($12), so you can pump the fluid in yourself, while laying under the car.

Mine was pretty straight forward, I'm not sure anyone has mentioned this in this thread, but make sure you crack the FILL plug before you drain the diff!! Some are on real tight and the plugs round off easily, so it is easy to be screwed with an empty diff, a rounded/stripped plug, and no way to fill it!!

Be ready for a stinky garage, or in my case, a stinky outside area lol.
 

steeven001

New Member
Jul 15, 2007
30
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Toronto
How often do you guys recommend changing when using synthetic oils compared to mineral oils?

Right now I have the Ford LSD additive with Castrol 80W90 Hypoc C gear oil (I think it's mineral type oil). And I've had it in there for about 30 000kms now and I just checked the maintenance schedule and it says every 48 000kms.