diff fluids

Hi,
I just want to doublecheck this with you guys:

I have a 09 v6 4wd base model

I can use 75w90 in the front, rear, and transfer case and I don't need to add anything else right? Someone told me to double check on whether or not it needs anything else or has to be toyota brand gear oil.

Also fogive the dumb question but I don't really have true LSD do I? Its more of an electronic LSD?

Thanks again.

 

thanks

 

I have the same year and same specs as you and I run

$30 75W-90 Synthetic Gear Lube - 1 Quart (Pack of 2)

75W-90 Red Line with no problems.

 

I emptied out the 2 diffs and the transfer case and the transfer case and rear were golden brown and the front was black and cruddy looking, the cap on the front had a big ole blob of sludge but the other caps were pretty good.

It doesn't make sense to me as I know nothing has been done to the diffs or transfer case for at the very least 18000 miles....

 

I've only driven maybe 500 miles with 4wd on - so i would have thought the rear diff would be dirty and the front and transfer case clean -

when I driving around in 2wd I'm the truck is rear wheel drive right?

Stupid questions I know...