I really don't know why I have not done this sooner, I guess I just didn't think about it. I don't wheel off road much any more. When I had my jeep all lifted and such I wheeled alot, I was more in tune with this I guess.
I stumbled upon the sticky about diff, trans gear oil change and thought, man I need to get this done. asap.
Results, went to Autozone, puchased the regular 75-90 gear oil, don't have the ls so no worries there.
Rear- drained and it look like black coal oil, nasty with the usual stank that gear oil has. The plug w/magnet had very little on it. suprised slightly.
Front- sucks taking off the skid plate. Front was real simular to the Rear with a little more metal on the magnet.
Trans case- pulled the plug and brand new oil came out. It looked as good as what I was putting back in it. Really suprised.
Anyway that was my findings, gonna pay more attention to this area now for sure, gonna drive this truck till the wheels fall off. After all that is why we buy Toyotas.