Trigger warning! Fluid question

[Zach_M1078A1]

Sorry, never post about fluid folks.
Has anybody ever gotten away with using T4 in their 3070 Allison transmission? I realize this is not the ideal choice, but I have a very large quantity already and I am a little tight right now as far as money and I’m trying to keep cost down but not at the cost of hurting the transmission

 

[GeneralDisorder]

I wouldn't.

The military currently uses 15w40 in trucks that were shipped with it. Newer trucks are shipping with ATF (these are all Allison 3700SP transmissions not the older 3070SP) and the Army is servicing these with synthetic Dex IV. From what I can tell the Toyota T-IV is only equivalent to a Dex III spec.

I would leave it 15w40 or switch it to Dex VI or Allison fluid. These transmissions are over 1000 lbs of wallet wrecking aluminum and steel. Don't mistreat them - they are considered one of the most reliable parts of these trucks if you care for them properly. That definitely starts with fluid.

I run synthetic Dex VI in my 3700SP.

 

[Ronmar]

Or was he referring to Rotella T4 15W40?

 

[GeneralDisorder]

Or was he referring to Rotella T4 15W40?

Yeah that's possible. I would guess that any 15w40 would be fine. It's not like the transmission is dealing with combustion products.

 

[Zach_M1078A1]

Yes rotella t4 15w40 in 3070.
Safe to use?

 

[Ronmar]

Yes rotella t4 15w40 in 3070.
Safe to use?

Yes, Rotella T4 15W40 should be just fine.