- Jan 12, 2007
- 169
- 1
- 18
l, I have a T5Z in my Lincoln Mark VII, it ground going into 4th. I changed the fluid, not thinking I used Mercon V, it ground 5th, 4th gear issue gone...just moved to 5th... Okay, I drained the Mercon V out and put in regular Mercon. It still grinds, I rebuilt the trans a short while back, which doesn't make me feel good about it grinding, I used all new synchros and bearings and such, end play perfect, the whole 9 yards. It shifts great, but 5th, I have to let the gears slow down a few seconds before I shift, which sucks, but what can you do, right?
Down to the question, what fluid is best? Is there a fluid that lets the synchros "bite" a little better? I've hears 10w-30 can be used, and several people have had lots of luck with motor oil, but I don't want to mess something up. I've also heard of the GM synchromesh, but with fiber lined synchros, that's a no, so I won't run that.
Any opinions? Thanks!
Down to the question, what fluid is best? Is there a fluid that lets the synchros "bite" a little better? I've hears 10w-30 can be used, and several people have had lots of luck with motor oil, but I don't want to mess something up. I've also heard of the GM synchromesh, but with fiber lined synchros, that's a no, so I won't run that.
Any opinions? Thanks!