2000 4runner rear diff replacement

[Mottclops]

My housing rusted through around the bracket for the brake flex line.
I am about to replace my 2000 4runner rear differential with a complete assembley (housing,defferential,axels,backing plates springs, sway bar, brake drums,etc.) from a 2002 4runner only 20k miles.

The 02 assembley came with no oil for shipping purposes. What I would like to know is the weight and grade of oil for this project?

V6 5spd
FGR 4.10
no locker
16 ich wheels
abs brakes

Thanks for any help.

 

[Bighead]

The 2001 owner's manual says this:

Rear differential
Above –18 deg C (0 deg F)
SAE 90

Below –18 deg C (0 deg F)
SAE 80W or 80W–90

Personally, I use Amsoil Severe Gear 75W-90 in both diffs.