Diff Oil

[USMC_Turbo6]

Hey guys what brand and weight Diff oil are you guys running.

 

[87gninpa]

Any 80W-90 is good with a bottle of GM additive. Usually just use whatever gear oil is cheapest, the additive is the important part. 210k on the stock rear and no issues.

 

[williamsGN]

http://turbobuick.com/forums/threads/rear-axle-oil-change.343302/

 

[Ttype6]

Hey guys what brand and weight Diff oil are you guys running.

I never had any luck with the additives. Here is one of only three oils that Eaton recommends and it has always worked well for me.
http://www.summitracing.com/parts/lak-32970?seid=google&gclid=CMyPvdyEjLYCFUWd4AodSUAAEA

 

[RmvBfrFlght]

When I changed the lube in the rear (posi) I though about the application a bit. Our cars produce prodigious amounts of torque. As such I went with Valvoline 85W140 petroleum oil. The heavier weight just due to the level of torque the drive train is subject too.

So far so good. Have been running 21 psi, and expect to be in the high 20's this Summer.

RemoveBeforeFlight

 

[williamsGN]

Used 140 in my old car and put thousands of miles on it, put 80 in this one and so far so good.

 

[Ttype6]

Our cars produce prodigious amounts of torque. As such I went with Valvoline 85W140 petroleum oil. The heavier weight just due to the level of torque the drive train is subject too.

Posi diffs don't need a special lube base on the amount of torque they are subject to. They need the lube to allow the clutches to slip during turns when the wheels rotate at different rates of speed.

 

[RmvBfrFlght]

RmvBfrFlght said: ↑

Our cars produce prodigious amounts of torque. As such I went with Valvoline 85W140 petroleum oil. The heavier weight just due to the level of torque the drive train is subject too.​

Posi diffs don't need a special lube base on the amount of torque they are subject to. They need the lube to allow the clutches to slip during turns when the wheels rotate at different rates of speed.

Whatever...

RemoveBeforeFlight

 

[Joeld]

I went with synthetic, which stated it was designed for posi so thinking I may not need additive. This post is very helpful, if I sense any chatter I'll simply add the additive. This post has a lot of good information in one spot, I searched much in the past to find similar information.
Joel

 

[Ttype6]

I went with synthetic, which stated it was designed for posi so thinking I may not need additive. This post is very helpful, if I sense any chatter I'll simply add the additive. This post has a lot of good information in one spot, I searched much in the past to find similar information.
Joel

Again, I tried this years ago and never got rid of chatter until I used Lakewood BFL. I've used it ever since.

 

[NorEaster]

I went with synthetic, which stated it was designed for posi so thinking I may not need additive. This post is very helpful, if I sense any chatter I'll simply add the additive. This post has a lot of good information in one spot, I searched much in the past to find similar information.
Joel

The posi from Eaton says not to use synthetic. Not sure what you have though, Im sure it will be fine.

 

[williamsGN]

 

[Joeld]

If i remeber right i went with suggestion from spring cleaning i will check again

Easy to drain and swap if the jury says so

I have stock posi

 

[Joeld]

Yes spring cleaning references synthetic

The lube stated on it that it was good for posi

Joel