MT90 For Everything?

I've read threads for over a week, but I still had just a couple questions before I dive in:

Bought my 2nd gen used, and she's up to 90,000 now. Since I tow fairly often, and dont know the history, decided I was going to swap fluids in the 5sp manual. I read good things about Redline MT90 (

$26 75w-90 Synthetic Gear Lube - 1 Quart (Pack of 2)

75w-90), so I settled on that. But while I'm under there, I figured Id do everything else too (front diff, rear diff, and t-case).

Already added up all the capacities, little over 8 quarts:
Transmission: 2.3 quart 75w-90
Transfer Case: 1.1 quart 75w-90
Rear End: 3.12 quart 75w-90
Front End: 1.6 quart 75w-90
Total: 8.12 quart

They all call for 75w-90, so my question is, can I just buy 9 quarts of Redline MT90 and use it all the way around? Or is there a reason this is a bad idea? I have the 2010, so i don't need the slip additive.
I do see a lot of folks using the Mobil 1 synthetic 75w-90. Should I use that in the diffs instead? Not too worries about the price difference, just want to do it right the first time.

Thanks in advance for any advice

 

I did this same thing a year and a half ago when I bought my 2.7 MT 2009. I did a fair amount of research and ended up using all Redline products. However, I used a combination of two fluids, MT90 and 75W90. There were a few reasons I chose to do this. First off, on the back label of the MT90 it specifically states not to be used in RWD differentials (if I recall correctly). In addition, my manual calls for GL5 fluid specifically in my differentials, and GL4 or GL5 in my transmission and transfer case. Therefore, I used the MT90 (GL4 rated) in both my transmission and transfer case and 75W90 (GL5 rated) in both my differentials. In addition, on the redline website, the MT90 is billed specifically as a manual transmission gear oil, and the 75W90 is billed as differential gear oil. I believe the manual actually calls for 75W85 in our differentials, but I had trouble finding that fluid at the time and read a bunch of posts online about people using 75W90 in its place without any problems. As mentioned, I put all these fluids in 1.5 years ago and have had no issues.

 

^^ What he said. The MT90 is GL4 and really should only be used in the transmission and transfer case. Get the GL5 for differentials.

 

Couldn't have asked for a better response. Thank you much NewToTacos