hi,i use in my T-5 gearbox Torco gear oil full synthetic75/90w,is that right?i have put in the T-5 2years ago this gearoil and i don't have any promblems.Now,with ATF original oil the gearbox after 3 ours driving make noises especialy summertime,not only mine but allmost t-5 gearbox,
my bet is that the right gearoil is full synthetic 75-90W.I ask your opinions.thanks