Just wanted to touch back on the BW44-44 transfer case fluid:
Here is the MSDS for Mopar BW44-44 Transfer Case fluid #68089195AA:
https://www.kwparts.com/media/1695/68049954ga_eng.pdf
Here is the MSDS for Shell Spirax S2 A389 transmission fluid:
https://shop.sclubricants.com/pub/media/sds/shell/Shell-Spirax-S2-ATF-A389-MSDS.pdf
Look at the safety section, they are identical. Considering that the Shell is an Allison TES-389 certified fluid, chances that these two would be identical are nill. By the way, Allison asks for $50K just to start the certification process (set up a dyno), plus all subsequent costs.
It's basically Dexron III(H) fluid with an update to protect Viton seals.
In 2018 RAM switched the transfer case fluid to Mobilfluid LT.
The only reliable way to tell what you have in your transfer case is when you do your first drain and fill. If RED fluid comes out then it's ATF, if it's AMBER or BLUISH (depending on condition and how the light shines on it) it's Mobilfluid LT. I doubt that you will find Mobilfluid LT at least up until the 2018 model year, but some input from others would be appreciated.
I also take back my recommendation for adding Lubegard Platinum ATF protectant to any of the fluids I'm about to list. It contains friction modifiers and the last thing you need is for your transfer case clutch to slip when you need it the most. Lubegard Red ATF Protectant would work, but the fluids below are of such high quality that you don't need it.
Suitable replacements:
For RED Dexron III(H) ATF (BW44-44 and BW44-45):
- Shell Spirax S2 A389
- Mobil Delvac 1 ATF - it's TES-295 approved and suitable to replace Dexron III(H) and TES-389 fluids - this is a huge upgrade to what came in your transfer case but it's $50/gallon
- Castrol TranSynd - TES-295 certified - upgrade to original fluid
- Shell Spirax S6 A295 - TES-295 certified - upgrade to original fluid
- AMSOIL MV ATF
- AMSOIL TORQUE DRIVE - a Castrol TranSynd clone and not officially tested or approved by Allison
- RedLine Oil D4 ATF - recommended for TES-389 applications
- RedLine Oil High-Temp ATF - recommended for Dexron III applications - use this if you really abuse your transfer case
For AMBER colored fluid - Mobilfluid LT (BW44-44, BW48-11, BW48-13):
- Mobil 1 Mobilfluid LT - obviously - it's sold only in 5-gallon buckets, so a bucket will outlast the useful life of your truck, unless you have friends nearby with BW44-44 (2018 and newer), BW48-11, or BW48-13 transfer cases - then you can all pitch in
- RedLine Oil MT-LV - 70W/75W - according to David Granquest from RedLine Oil this is a suitable replacement for Mobilfluid LT - he did not say to use this in the transfer cases I listed, he just said that it's a suitable replacement
- RedLine Oil MT 75W-80 - this is a bit thicker than Mobilfluid LT and is used in transfer cases and this is what I found to match Mobilfluid LT
- sorry, there aren't many great options but Mobilfluid LT is not expensive on a per quart basis, it's just not sold in anything less than a 5-gallon bucket.
Please be cautious about what the AMSOIL and RedLine websites recommend. Their databases are a bit out of wack and not up-to-date, and they don't seem to care about updating them.
I hope this helps.