i want to change out all the fluids the trans is the auto pushbutton what fluid can i run is maxlife ok or do i need the GM fluid?Also i am doing both diffs and going to use GL5 supertech or mag1 full syn 75w/90 is this the best option and the eaton lockers do not require any additive correct? Has 240k also front is listed as 1.75 qts rear 2.5 what is transfer case capacity?