How much additive to add to LSD diff?

[slowma70]

Hey Sm, Im planning on doing a fluid flush on my LSD differential tomorrow and my question is how much LSD additive should i add?
Im going to use Motorcraft 80w-90 rear axle lubricant and Motorcraft Friction modifier additive(it comes with 4oz).

Hope some1 can help..Thanks

 

[GrimJack]

Ideally, add smallish amounts - 1/2 oz or so - until the rear diff shuts up when turning hard in either direction.

 

[suprarx7nut]

About a cap full has been good for me.

 

[Maple191]

Honestly when I did mine a couple weeks ago. All I did was flushed out the old fluid by pumping new fluid trough the diff while the drain is still off untill I can see new clean oil come through. (Rear diff had 10,000km on the fluid) I tightened up the diff drain, I put the whole bottle of 4oz's and then I filled it with gear oil untill it started to come out the filler hole.
Mind you my diff is all original with 114,000km's. She was even silent when I drove with out the moddifer in it.

 

[slowma70]

alrite i will do that..Thanks for the info every1