moosestang

Now i'm confused. For the record, I HAVE NO SHIFTING ISSUES, no clunky shifting, no issues at all. Doc stang was the original poster with shifting issues and I don't even know what clutch he has.

I was just curious if the synchromax is bad for the 3650. I've been using it since July or August with no issues. Still waiting to here from royal purple.

Hammeron, vacuum bleeding is the factory recommended method as you probably know, but I and many others have successfully bled our clutches by simply jacking the drivers side front way up high and pumping the clutch slowly, then progessively getting faster. It will take a few times before you get the pedal back, but it does work.

I did use my hand to push the pedal in the beginning and I redid the whole process 2 days later.

hammeron

thank you AmericanPowertrain, i have an
air compressor so this vacuula item sounds
interesting, i'll look into that


moose, i do know you had great success doing
it that way, i was just curious if there was another
method

moosestang

It won't hurt to do both. Did you figure out where the 2 long bolts go for the transmission? I thought maybe I had the wrong bolts, but at least you confirmed that 2 or yours were longer than the others.

moosestang

I found my answer by checking their frequently asked questions.

"For manual transmissions and / or transfer cases specifying a Ford Mercon® or GM Dexron® ATF, Royal Purple recommends either its Max ATF or for greater performance, its Synchromax."

hammeron

i saw somewhere that the longer bolts go through
where the 2 transmission/engine dowels are, so
that's where i ended up putting them (they went
in very easily).

it was for an 03/04 cobra, but i figured well maybe
the same thing applied to our trannys. if i was wrong, then
maybe they are in there for good now.

MustangGT0405

I am on a business trip but I dont think my car moves at all, but I will try it when I get home in 2 weeks.

I dont really have any problems once the car is in motion, only getting into first and reverse. I also think it has something to do with temprature as it gets harder and harder the longer I drive, and when I feel heat from the trans. When it is cold it goes easy. I wonder if changing to a different "better" fluid would help. What is recommended. Honestly if I am not doing any horrendous damage I think I will just leave it be, other than the fluid change.

I will keep your trans upgrade in mind as I probably wont ever go over 650 fwhp, and $1900 isnt bad really. Do you do core swaps or anything?

Thanks,

AmericanPowertrain

All right, let's see: The fluid could definitely be causing problems. I would put GM or Pennzoil Synchromesh in place of the Dex3/Mercon that is in there now. You may also have a clutch adjustment problem, which is aggravated by the expansion of the clutch when warm. It could also be as simple as a tightly tolerated shaft. If the gears are not lined up when you are engaging first or reverse from a standstill a tight shaft will not naturally rotate into place. If you lift your foot off the clutch just a tiny bit and the shifter slips right into gear then you really don't have a problem at all. Try it.

As far as core swaps go, the 3650 products carry a $350 core charge or you can send your own transmission in to be built into an Extreme and sent back. A lot of guys do this to avoid the core charge and because they want their own gearbox back. This is not a great option if you cannot be without the car for a few weeks while the trans gets built, but we always return the core charge promptly when the old transmission arrives.

Let me know if you want to get something on order. AP

MustangGT0405

Thanks AP.

I have to say from what I feel in the car, it sound like it isnt lined up correctly and I have to pull through it hard. Sounds like I have a "tight shaft". I will have to tell the wife

Temp also seems to be a contributor. I have about 19k miles on the car with the original fluid and about 12k miles of that is with the SC. Probably a good time to change it out.

I will try all that and see what happens.

I will bookmark your site for any trans needs I have. Appreciate the input and it is nice to have a trans person around as that is one part of the car I know next to nothing about.

AmericanPowertrain

I'm glad to be of help. We find that the transmission is definitely one of the least understood components in the car, which is a shame because it is responsible for a lot of the car's performance personality. It is also a shame that Ford did not build transmissions for modern Mustangs with bigger power and tuners in mind. It's good for our business, but there are a lot of guys out there with gearbox problems who don't even know that they can upgrade their transmissions. Most think they have to buy a TKO to make any real difference.

I had to edit the post because your joke just about flew by me. Funny stuff man, funny stuff.

moosestang

Glenn, try the synchromax. It really does run much, much, much, much, much cooler than it did with the stock fluid. I drove around Gainesville all day and my hurst shifter never got hot. It used to burn my hand. I don't know if it will help your problem, but it can't hurt.

Here's RP's reply to my email. I don't think I put in 3.8 quarts. I filled it to 1/2 inch or 1 inch below the fill hole like the manual states.

Paul,

Yes, the RP Synchromax is the recommended fluid for the Mustang manual transmission.
TR 3650 takes 3.8 quarts.

The XT-2-QDS is the Ford synthetic Mercon factory fluid. We recommend using our Synchromax in place of this instead of the Mercon for manual transmissions.