67 coupe
289 4 brl

Simple, easy question but I can't find an answer.
What type of gear oil should I use ti full my 8" diff?
The tag does not have the L code for limited slip so it should be. Both wheels turn when you turn one or the other but the flange does not. Both wheels turn when you turn the flange.

 

they're turning in the same direction? then, you'll need a bottle of "friction modifier" available at most auto parts stores.