wslytoy said:
man I was actually gonna post that to him, btw, thanx for that discount code, saved me $5, $5 is a lot to my broke ass, hahaha! I already asked Gadget this, but do you know if the trans and t-case share fluids? If so, I've got 4 quarts, how many more will I need? I wanna do the oil change sometime in the next couple of days. Thanx, Wes
front diff: 1.2 qt (Hypoid GL-5 SAE 75w-90)
rear diff: 2.8 qt with locker, 2.7 w/o (Hypoid GL-5 SAE 75W-90)
manual trans: 2.3 qt (API GL-4 or GL-5, SAE 75W-90)
x-fer case: 1.1 qt (API GL-4 or GL-5, SAE 75W-90
Hypoid refers to gear cutting (the curved shape of the teeth). Hypoid gears slide, creating higher pressure- therefore the oil must be able to withstand this.
I would venture to guess most guys use the hypoid formula in thier trans/t-cases (even though those gears are not hypoid) out of convenience because most guys (myself included) change diff oil more often than t-case or trans oil. This shouldn't hurt anything, although many manufacturers say that Hypoid oils, with their additives, leave a film on the synchronizers and actually lubricates these parts too well, preventing them from functioning correctly. This typically shows up as minor grinding of gears and difficulty in shifting, both problems especially evident going into second gear and in the first few miles of driving with a cold car.
Because of the charachteristics of the gear teeth, use of non-hypoid in the diffs is unwise IMO.
Some manufacturers call thier Hypoid 'EP' for Extreme Pressure. Hope this helps!