Sharky1948
Junior Member
HD Semi-Synthetic for Trans for FL, FX, 4 and 5 speeds next question.......is this OK to use in a new 6 Speed tranny?
My understanding is that you want to use an oil formulated for the helical gears in the six speeds. So, the short answer would be no. Check out the Self-Help section for good recommendations on oils...Spectro for the tranny.