Originally posted by JB1:
guys, what is this "EP" lube terry is talking about?



He is talking about extreme pressure additives (EP).

In a stock transmission there is no need for EP additives according to his explanation.
With a Torsen I have posteed that EP fluids will quiet the noise down that these diffs make. He's bascially saying I'm all wrong because the friction is what makes the diff work.
From a simple perspective, and it is not that simple, this might be true. That part that IS an issue is the Torque loads the transmission sees and the design range of the differential. The T2 was designed for a friggin Ford Focus, NOT a V6 contour!
This is directly from Torsen by the way.

This part is NOT from Torsen:
Simply put, friction is a product of the coefficients of static and dynamic friction multiplied by the Force applied, whether it be gravity or something else; along with a few other factors.
Simple math indicates that if the Force applied is 3 times HIGHER than that which the part was designed for would mean that the coefficient of friction doesn't have to be as high for the differential to operate the same way.
In fact you could say that it could be three times less and the product would still be within the design limits that would allow the diff to work.

In the meantime the high pressure additives will protect the gears from the excessive loads. I qualified this by saying "With High torque loads AND an ATB, use something with pressure additives" if you want to reduce the noise.

This won't hurt the differential at all and as long as the transmission shifts correctly, it shouldn't hurt anything else in the transmission either. It is the friction that allows the synchros to work and if the friction is still good enough that it shifts fine....Then how can pressure additives hurt when they will protect the gears BETTER from wear??

(assuming these are additives that specifically don't harm yellow metals)

Former owner of '99 CSVT - Silver #222/2760 356/334 wHP/TQ at 10psi on pump gas! See My Mods '05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red '06 Mazda5 Touring, 5spd,MTX, Black