Correct rear axle gear oil?

[Monterey]

Hello,

My 73 convertible is coming along nicely, just added a set of KYB gas shocks and looking forward to a long test ride. But I've got a question on the proper rear oil. It's coded as a "2" which is a 2.75 conventional rear axle. When I first got the car running last summer I had a shop drain the rear end and they replaced it with GL5 80/90 oil. Is this correct?

I'll be taking her for her first 300+ mile drive in a week or so and want to make sure she's ready for it.

Thanks,

Scott

 

[Jeff73Mach1]

that should be fine for a peg leg rear end. If it is a track lock, it would need an additive, but it would almost have to be a replacement to be a track lock rear end

 

[Monterey]

that should be fine for a peg leg rear end. If it is a track lock, it would need an additive, but it would almost have to be a replacement to be a track lock rear end

Thanks Jeff. I was reading something about the original requirement being GL6 but noticed they had replaced mine with GL5. Not sure of the difference.

Scott

 

[Jeff73Mach1]

GL6 is obsolete and not generally available. I think you can get it in Canada. GL5 is just fine.

 

[marks73]

Not to jump the post but, what do I need to use for a Detroit Locker?

 

[Jeff73Mach1]

from Eaton

"What kind of oil should I use? Can I use synthetic? Do I need friction additive/modifier?

A quality petroleum/mineral based oil works best in the Detroit Locker units. We do not recommend synthetic oil. Friction additive/modifier is not required."

http://www.eaton.com/Eaton/ProductsServices/Automotive/AutomotiveAftermarket/Differentials/FAQforDifferentials/

I personally would run synthetic-detriot lockers don't use clutches, but their mechanical bits are under a pretty heavy load.

 

[marks73]

Thanks Jeff! Great info.

 

[Jeff73Mach1]

One thing about being a lawyer, you learn to research efficiently.

 

[jb73Mach]

that should be fine for a peg leg rear end. If it is a track lock, it would need an additive, but it would almost have to be a replacement to be a track lock rear end

Could have the 2.75 traction lock from the factory - mine does and confirmed by Marti.

 

[Monterey]

that should be fine for a peg leg rear end. If it is a track lock, it would need an additive, but it would almost have to be a replacement to be a track lock rear end

Could have the 2.75 traction lock from the factory - mine does and confirmed by Marti.

Marti and the tag on the rear end both confirm the conventional 2.75. :-(

 

[Jeff73Mach1]

well I have been educated here. I won't make that mistake again! Watch for my next exciting and spectacular failure.

 

[jb73Mach]

well I have been educated here. I won't make that mistake again! Watch for my next exciting and spectacular failure.

So what is the proper additive for the traction loc? It is obviously working well now as proven by hard launches, wet roads, and curves

 

[Jeff73Mach1]

http://www.amsoil.com/shop/by-product/gear-lube/slip-lock-gear-oil-additive/?page=%2fstorefront%2fada.aspx Is what I have used in the past. Ford sells their own for under 10 bucks. If possible mix with oil before adding to read end to prevent glazing the clutches. Remember this stuff let's the clutches slip a little more, so don't think more is better!

Roll Tide, Turkey, I got tickets to the game!!!