lsd

[jamesmwalker79]

does anybody know what the best oil to use in the las rear end 89 turbo. i havent been able to find it anywhere.

 

[A. Jay]

does anybody know what the best oil to use in the las rear end 89 turbo. i havent been able to find it anywhere.

Well the manual says straight 90w, but I couldn't find any (and I was told it wasn't made anymore, might be bs though), so I gave up and put 80-90. I don't know if I'm taking a risk in the weight that I chose, but what I can tell you is that you need to make sure it's for lsd hypoid gears, and that it has nothing else added.

 

[Poodles]

Try digging around in here: http://www.supramania.com/forums/forumdisplay.php?108-Motor-Oil-Lubricants-amp-Filtration

 

[speedgilligan]

when i did mine, ALLDATA suggested 75w-90 or GL-5 and that what i did

 

[jdub]

does anybody know what the best oil to use in the las rear end 89 turbo. i havent been able to find it anywhere.

LOL - You damn sure didn't try very hard. This subject has been beat to death. Also, what does this thread have to do with 7M-GTE Tech? Thread moved to the General section.

Well the manual says straight 90w, but I couldn't find any (and I was told it wasn't made anymore, might be bs though), so I gave up and put 80-90. I don't know if I'm taking a risk in the weight that I chose, but what I can tell you is that you need to make sure it's for lsd hypoid gears, and that it has nothing else added.

I don't know what manual you are looking at, but the TSRM and the car manual says 80W or 90W depending on OAT...it allows the use of 80W-90:
http://www.cygnusx1.net/supra/Library/TSRM/MK3/manual.aspx?Section=A&P=35

This is 20+ year old data (for a 1990). Modern LSD gear oils are far superior and will be a multigrade 99.9% of the time - even mentioning a straight grade is useless. IMO a 75W-90 is what you want to use.

Try digging around in here: http://www.supramania.com/forums/forumdisplay.php?108-Motor-Oil-Lubricants-amp-Filtration

The case in point of where to look

when i did mine, ALLDATA suggested 75w-90 or GL-5 and that what i did

If the LSD has a lot of miles on it, a conventional gear oil (like the Ford product) is best. For a new (or rebuilt) LSD, a synthetic will provide superior performance. You have to pay attention to the formulation - friction modifier is required for and limited slip LSD. The Ford gear oil does not have it - you have to buy the modifier seperately. Red Line and Royal Purple synthetic gear oils already contain the modifier. As I said above, a 75W-90 is what I would use.

 

[A. Jay]

(...)
I don't know what manual you are looking at, but the TSRM and the car manual says 80W or 90W depending on OAT...it allows the use of 80W-90:
http://www.cygnusx1.net/supra/Library/TSRM/MK3/manual.aspx?Section=A&P=35

This is 20+ year old data (for a 1990). Modern LSD gear oils are far superior and will be a multigrade 99.9% of the time - even mentioning a straight grade is useless. IMO a 75W-90 is what you want to use.
(...)

Sorry, I forgot that I read that in the Haynes repair manual. I would also like to apoligize on behalf of Haynes for failing again. I'm looking at it right now, and it says "Differential lubricant, Limited slip differential, 90W GL-5 limited slip hypoid gear oil." You know what, this shit's going in the recycle bin. Next time I go to the dealer to ask for new e-brake and shift boots, I'm gonna ask for a tsrm. Thanks jdub

 

[Poodles]

Keep in mind the TSRM is a bunch of volumes all about $100 each. But I agree, my Haynes manual sits on a shelf ever since I did my valve cover gaskets when it didn't give a torque spec for the fasteners.

 

[deabionni]

I'm gonna ask for a tsrm.

http://www.cygnusx1.net/Supra/Library/TSRM/MK3/default.aspx