mustang13gt

ok i changed my transmission fluid from syncromesh to mobil 1 atf and now when i shift at certaing rpms i get a scent of mobil 1 atf. i put the same amoount in as i did with the syncromesh. From what i can tell it is not leaking from anywhere. and does not seem to be burning on the transmission before it gets to ground. anyone have ideas of what it going on?

cliffyk

How did you fill the tranny, through the fill hole or did you pull the shifter?

How much fluid did you use?

mustang13gt

i put in just over 3.2 quarts definently under half of the last quart. I also drained the old syncromesh when the fluid was very hot so it all came out.

cliffyk

I asked if you had put it in through the shifter turret because if it didn't seal well that could be the source of the odour.

I had a similar issue after we did my clutch because when I reinstalled the shifter the gasket shifted and didn't seat properly--I had to take it apart and reset the gasket...

mustang13gt

i filled it threw the fill hole. i wil have to check around to gaske

mustang13gt

I filled it threw the fill hole on the side of the transmission. after thinking back when i put in the royal purple i had the same results i could smell it. then i switched syncromesh and i couldnt smell it now i am switching to mobil 1. what could be causing this?

cliffyk

I don't know what friction modifier Synchromesh uses, however both RP and M1 use PAO (poly-alpha-olefin) and POE (polyol esters) as the friction modifier additive--they are the ones that have that distinctive smell.

The only way the odour can escape, barring bad seal(s), would be through the shifter turret--what shifter are you running, what condition are the boots (inner and outer) in?

I got a very slight hint of it once in a while right after I changed the fluid, and after we did the clutch, but I think that was because a bit of spillage. It disappeared after a couple hundred miles).

Is the odour strong or just noticeable?

mustang13gt

it is not very strong but it is noticeable. the shifter i am running is a pro 5.0 i beleive and it looked to be in good condition.

cliffyk

If the boots do not fit tight or are torn the stink can come up through the shifter mechanism--if it doesn't go away and gets annoying I'd lift the shifter surround and inspect the boots.

One thing I know I wouldn't do is switch away from the M1, my transmission shifts smoother than it ever did with the RP Synchromax. Even that 1-2 "hitch" is barely noticeable...

mustang13gt

what would i look for to see if the shifter is getting old?