33 dodge rear end with 4:37 gear ratio

[Sactownog]

what oil to use in rear of 33 dodge with 4:37 gears? 

[zeke01]

I use 140wt fluid in my '33 Dodge rear end. It is the original unit. Zeke

[Bloo]

You just rebuilt this didn't you? Were there any brass, bronze, copper, or non-steel parts in there? If not, just get the best quality GL-5 hypoid lube you can find.

 

If there were brass, bronze, or copper parts in there, then get something that is "safe for yellow metals", or look in the datasheet (for an oil you are considering) and see how it did on a "copper strip test".

 

I'll leave it to zeke01and others how thick the oil should be. I don't know.

[zeke01]

Bloo: Like you, I have no idea what the contents of the OP's rear end are. Once you start mixing and matching parts you are out of my field of expertise As far as I'm concerned, original parts-original oils. Zeke

On 8/4/2019 at 9:31 PM, Bloo said:

You just rebuilt this didn't you? Were there any brass, bronze, copper, or non-steel parts in there? If not, just get the best quality GL-5 hypoid lube you can find.

 

If there were brass, bronze, or copper parts in there, then get something that is "safe for yellow metals", or look in the datasheet (for an oil you are considering) and see how it did on a "copper strip test".

 

I'll leave it to zeke01and others how thick the oil should be. I don't know.

 

[Sactownog]

I spoke to the rear end shop owner, he said to use Lucas Oil 85-140 so that is what I used. 1 step closer to getting this thing back together.