Differential fluid

[mr84ss]

Whats up family. Whats the best store bought brand and weight differential fluid for our cars?

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[BEATAV8]

I think I'm growing partial to the Lucas heavy duty.

 

[dynoman]

Lucas 80W-90 here also , no posi additive needed .

 

[Chuck Leeper]

Depends on the diff.
Eaton says 80/90 with as little additive as possible.
Clutch units like the orig, 80/90 w/ the additive.

 

[dynoman]

Chuck , the Lucas 80w-90 I use , says for use in limited slip dif's . I had the car out today and got a very slight chatter when turning full lock from a parking spot , other than that it's all quiet , accept for the sound of both tires breaking loose !!

 

[Chuck Leeper]

Chuck , the Lucas 80w-90 I use , says for use in limited slip dif's . I had the car out today and got a very slight chatter when turning full lock from a parking spot , other than that it's all quiet , accept for the sound of both tires breaking loose !!

Must be a clutch style. No chatter w/ the Eaton, as it's a gear set up..

 

[mr84ss]

Thanks guys for all the input. I dont know what the previous owner used in mines. What are your thoughts on mobil 75w90? My buddy just bought his Gn last week and the guy he bought his from said he uses 75w90 in it.

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[achalmersman]

I use the valvoline synthetic 75-90 with no additional additives.

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[mr84ss]

I use the valvoline synthetic 75-90 with no additional additives.

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Ok thanks. Maybe thats what he used

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[Frederickdav]

What is the point of the additives? When would one use them?

 

[achalmersman]

Additives are to help lessen chattering while making turns. Basically it makes the clutch packs slip more. Too much and you'll have a peg leg

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[mr84ss]

Which one or combination i need for a 87 GN

 

[mr84ss]

.

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[hensleyt]

Volvoline
Any go to your GM parts dep for limited slip

 

[mr84ss]

View attachment 288820 Volvoline
Any go to your GM parts dep for limited slip

Ok thank you and for reply

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[Ttype6]

I've used this for 27 years. Tried many types. This stuff works. You want the yellow label. 32970


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