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hardk0re,Jul 1 2009, 09:21 PM Wrote:Basically the weak point in the MTX75 is the synchros.  If you want a bullet proof tranny your best bet is to upgrade those.  The only person I know of is Terry Haynes and thats if you want to drop 5k on a tranny.  BUT it will be smooth as glass and outlast your car.  Thats not for everybody so below are my thoughts on the MTX75 "upgrades" available.

The 4.07 final drive gears from ford racing are good ONLY if your going to not boost your car.  With boost 1st gear is far too short to be usefull.  What is nice is that 5th gear becomes very usable as a passing gear even in low rpm.  What is not so nice is the fuel economy you loose because your rpm's are now higher to maintain 120km/h.

The lightened flywheel is something I would NEVER do again, it sucks at least in the focus.  In order to keep from stalling you will need a SCT tune to raise your idle and keep the engine from dropping rpms like a rock.  Even after 2 tuners tried to fix my issues I still stall out at times when its cold because my rpm drops way too fast.  What it does give me is faster reving, for rev matching.  And I guess a few HP. But i'd give those HP back to keep from stalling every morning at the same stop signs.

As for your clutch, lots of people have had good sucess with clutchmasters and spec.  I've got the spec stage 3 and it is very streetable, when you letup on the clutch slow you can still drive the car nice and smooth, but with your on the throttle and clutching quick the clutch grabs like #$#%$#%.  With this clutch and with any clutch the key is to follow the manufacturers specifications on break-in.  Don't cheat in this part or you'll be sorry.  The clutch spring is actually pretty soft in the spec stage 3, I thought it would be harder but it almost feels softer than stock.  It does not slip on me at all.

LSD is a nice option, driving aspects of the car are completely different especially when cornering and hard launches.  I've go the Torsen and really like it.  To be honest I don't know allot about the differences between the Quaife and the Torsen.  I got the Torsen purely  because of cost, it was less than 1/2 the cost at the time I purchased mine.


Fluid Matters, look into picking up some "ford honey".  Myself I have Royal Purple synchromesh and it works really good.  Feels much smoother than stock.



If I did it again, I would get a Spec Stage 3, or maybe clutchmasters stage 3,and a Torsen LSD.  And thats it, I wouldn't touch the flywheel or final drive.  If I had the cash I'd get a nice built tranny from Terry Haynes.
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what he said. I had teh same setup without the flywheel and it held 220 torque very well, grabbed every single time at teh track. B)