What lubricant should I run in a 9" Ford differential?

The rear end came out of a Taurus and is not positraction. There are too many lubricants to choose from, figured I'd ask the HAMB world. Thanks for any help.

 

80-90w differential lube. I use, and like Royal Purple.

 

Thanks for the info.

 

90 weight is fine, Vavoline among others has it in quarts with a pouring tip so its easy to get it in.

 

A Taurus???

I thought they were front wheel drive.

 

It was a type... Thesaurus!!

 

Good point... They are front wheel drive

 

Maybe he's building a Cord Hot Rod.

 

The OP said "..it came out of a Taurus..." Maybe it was in the trunk.

 

I use 75w90 Amsoil

 

Front wheel drive was my first thought too, and definitely not a 9" ring gear.

 

Trick question,

 

Real Ford 9-inch use good old 90 weight gear oil, use the additive stuff for limited slip if you need it.