hey its me again..... i have a really annoying squeak coming from the rear of my vehicle. i have lubricated in between each leaf spring and the joints for the spring pack, and the outer shock hole and still have the squeak.

the squeak is a high pitched metal on metal squeak that i have only heard before when drilling through metal(with a dull wood bit). its not constant and only happens when the vehicle hits a bump or starts vibrating at highway speed(60-65). braking and acceleration do not effect the time between them or the loudness, seems like nothing effects the loudness or time between the squeaks.

could it be my differential? looks like it has leaked a bit as the entire bottom of the diff cover is covered in goo/oil.

please help i am pulling my hair out (almost literally) as i have to drive for an hour and a half 2 times per day and listening to that squeak is driving me insane