That's not accurate at all.True for virtually all modern transaxles.
For AWD, yes of course, different fluids for different components but I was talking about FWD manual transaxles, as was the OP. I can't think of any with separate sumps.That's not accurate at all.
Many of the cars and SUVs i have and still do own do not have the same fluid in each. For instance. The 955 cayenne my wife has takes a g4 for the diff front and back, but the transfer case uses g5 and calls for ( essentially) toyota v4 fluid for the transmission.
Yea g5 and the toyota fluid are basically the same and could be interchanged but the transfer case on these is picky and the g5 seems to work better.
My escape used MERC 3 in the trans and PS but the diff calls for 95w and the transfer case calls for a 75.
Please. Of your going to make wild claims... make sure they are accurate and not some fabrication of fiction you pulled from your rear.
OP use whatever the manual calls for.