borgwarner 4484 t case dexron iii or gear oil?

[jalikaria24]

hey guys i have a 2003 hummer h2 with a borgwarner 4484 transfer case. i changed out the transfer case fluid about 6 months ago and i did my research and gm says not to use DEXRON VI and to only use dexron iii so i did that and got royal purple dexron iii compatible fluid and put that in and its been running good.
but i recently came across some threads where people are saying that dex 3 is way too thin for the transfer case and that i should be using gear oil, i saw a couple people say that and not sure if its true or not.

ive always ran the gm stuff or dex 3 and its been working fine but my km's are getting high im already at 250,000 km so i wanna do the best for my truck.


what do u guys think? trust gm engineers or?

 

[ripcord]

I would stick with Dex III. Those units have an oil pump and not just splash lubrication.

 

[nascarnation]

This t-case is designed for Dex III not gear oil.
I'd recommend anything that meets Allison TES-389 (petro based) or TES-295 (PAO syn)
https://www.allisontransmission.com/parts-service/approved-fluids/on-highway-fluids

 

[thastinger]

that is a chain driven case, use ATF in it

 

[jalikaria24]

thanks guys any clue why people are saying otherwise? is it just because there paranoid?

 

[nascarnation]

There is a wealth of misinformation on the internet. Combined with a lot of marketing nonsense.