1985stang

I've had a newly rebuilt T-5 transmission since last summer and it is treating me well. However, i have been seriously stressing over what kind of fluid to put in it. It's bothering me because my last transmission went out when i started using gm synchromesh, and i need to get it right this time because i can't be buying a new tranny in a year.
-I changed the fluid at 500 miles with regular ATF
-Changed it again at 1000 miles and put pennzoil synchromesh in it and have been running that since.
I just ordered an MGW shifter which will be here middle of next week, and I want to change the fluid one last time and be done with it while the shifter is off. I've been researching and researching, and whenever i see "T-5 is supposed to only run ATF, and don't use synthetic because the synchros work by friction and synthetic can destroy them" i get more confused. Any input would be great, and i'll try to post pics somewhere of the mgw install.

FivePointOhh

you should only be running dextron III

92hatchLX

Everyone that I talk to that has a T5 is using the GM syncromesh.

1985stang

So Kyle, you think i should just buy the normal mercon/dexron III ATF and run that?

mjr46

I run amsoil synthetic atf/dextron III in mine, and others run royal purple, as long as it is atf for vehicles previously requiring Dextron III /Mercon, you'll be fine, don't worry about the BS and synthetic

FivePointOhh

yes, the back label will also say "ford manul transmissions" or something to that effect. the chilton manual and rebuild kit also say use dexIII. id use dex III

1985stang

Ok, i think i'll just buy a bunch of regular mercon/dexron III and flush the old stuff out. I'm sick of the guessing games and worrying if i'm hurting my new tranny. Can't wait for the shifter though!

minnow81469

I use synthetic and have no problems the mgw short throw shifter is nice too

1985stang

What brand of synthetic are you running?

minnow81469

b & m trickshift and i have used it for 3 years