I still think the darkening is from excessive heat -- failing components and/or LSD (good or failing). Each time I drained my MTL, it looked nearly new. Last time I drained it, my diff had locked and was wicked hot.... the fluid was very dark. This could also be combined with the bad batch theory.

MapOfTaziFoSho, Terry installed an LSD right? Has anyone seen dark MTL come out of a non-failing, stock diff mtx?

This is not to debate whether or not MTL is good/bad for our trannys... just trying to isolate the circumstances that generate the dark MTL.

morbid 2000 Contour SVT (black)