OK, What is your pick and is there a Top rated ATF ?

[James Ward]

I'm getting ready to have the fluid in my Transfer Case in my 2015 Tahoe LT changed or do it myself. What is the best ATF to use ? Thank You ahead of time.

 

[swathdiver]

Dexron VI is not Full Synthetic. I use ACDelco but others find Red-Line tops. One guy has even recorded an increase in gas mileage by using Red-Line transmission fluid over the stock stuff. Check out "Grump Bear" build on Pepper over at GM-Trucks.

 

[James Ward]

Well thank you Swathdiver, Can you use a full Full Synthetic ATF in the transfer case, and do anyone know of a magnetic drain plug for the transfer case ? And the differentials get standard 70/90 gear lube, at lease for the front diff, but the rear diff needs 'Limited Slip' fluid. What is this posi-traction diff get in the way of lubrication ?

 

[OR VietVet]

I always defer to what my owner's manual says to put in there.

 

[2010gmcyukon]

I also used the AC Delco Dexron ATF that was recommended in the manual.

 

[swathdiver]

Well thank you Swathdiver, Can you use a full Full Synthetic ATF in the transfer case, and do anyone know of a magnetic drain plug for the transfer case ? And the differentials get standard 70/90 gear lube, at lease for the front diff, but the rear diff needs 'Limited Slip' fluid. What is this posi-traction diff get in the way of lubrication ?

Dexron VI by ACDelco is today listed as Full Synthetic on the containers. So yes, use it. On my truck, the TC and front differential have magnetic drain plugs.

In the other post I listed what fluids go in the axles, they are different you do not need "posi-lube" if using the factory fluid. Aftermarket "may" be different.

 

[James Ward]

Dexron VI by ACDelco is today listed as Full Synthetic on the containers. So yes, use it. On my truck, the TC and front differential have magnetic drain plugs.

In the other post I listed what fluids go in the axles, they are different you do not need "posi-lube" if using the factory fluid. Aftermarket "may" be different.

I was at a large GM dealership getting the front mono-tube shocks on my 2015 Tahoe and I asked about the transfer case drain plug and I was told by the service manger that the Transfer case on a 2015 Tahoe or Yukon , has a magnetic plug on the bottom Drain plug, so I did get an answer on that question. and the fluid is fine so long as it is a DEXRON VI and as you mentioned, there is not special lube for the back differential. I have a 308 and it is a Posi-traction. Thank you all for your help.

 

[2006Tahoe2WD]

If the diff. is what is called a "Gov-bomb" I think that is a G80 type then it doesn't need a special fluid because there are no clutches.

 

[Lt Belspur]

https://www.valvoline.com/our-products/automatic-transmission-products/maxlife-multi-vehicle-atf

I have used this in all my vehicles.

2002 Tahoe Z-71, 2016 Tahoe Z-71, 2005 Isuzu NPR, 2005 GNC W4500

 

[Kpwweb]

AMSOil all the way.