2007 GT500 tranny and clutch replacement

#1
OK - time to swap the clutch - just thought I'd share some experiences.

The original 2007-2009 GT500 clutch was problematic - and also created problems for the tranny. Though it was a twin-disc design - the clutch could not handle the power, was stiff and difficult to engage, and had a lot of chatter. It had a tendency to overheat and warp the flywheel, which in turn caused synchro issues in the tranny - and grinding of gears. I've had the black GT500 since new and the tranny/clutch combo was completely swapped twice under warranty by Ford before 2010. Those swaps did nothing to resolve the problem other than putting in new parts that had the same design issues. I got as little as 3000 miles before the clutch and sychros were toast. It wasn't until 2010 that the clutch/flywheel combo was redesigned and resolved all of the problems.

The new 2010 clutch was much less stiff and easier to engage. It was quiet with no chatter - and there was no grinding of gears. It had much better performance - easily handling up to 900hp with very little wear and no overheating. I've had that clutch/flywheel in the black GT500 since 2010 - and it's had about 50,000 miles of 800hp+ - and it just now starting to slip a little.

Here are some examples of the original 2007 GT500 clutch/flywheel after less than 5000 miles.

Here are pics from today of the 2010 GT500 clutch/flywheel pulled out of my 2007 GT500 after over 50,000 miles.
I'm now about to install the 2013 clutch/flywheel combo - which I'm told has some additional improvements. Once done with that - I will do the same with the white 500 before it develops the problem and make it easier to drive.
 
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Scott Harrison

"Growing old is mandatory, growing up is optional"
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#2
That's very curious. The dual disc clutch/flywheel with its supposed strength is no match for the single disc and ally flywheel that looks very much like most OE systems.

You don't think it has anything to do with increasing maturity of the driver? ::)
 

Eric Nelson

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#4
OK - time to swap the clutch - just thought I'd share some experiences.

The original 2007-2009 GT500 clutch was problematic - and also created problems for the tranny. Though it was a twin-disc design - the clutch could not handle the power, was stiff and difficult to engage, and had a lot of chatter. It had a tendency to overheat and warp the flywheel, which in turn caused synchro issues in the tranny - and grinding of gears. I've had the black GT500 since new and the tranny/clutch combo was completely swapped twice under warranty by Ford before 2010. Those swaps did nothing to resolve the problem other than putting in new parts that had the same design issues. I got as little as 3000 miles before the clutch and sychros were toast. It wasn't until 2010 that the clutch/flywheel combo was redesigned and resolved all of the problems.

The new 2010 clutch was much less stiff and easier to engage. It was quiet with no chatter - and there was no grinding of gears. It had much better performance - easily handling up to 900hp with very little wear and no overheating. I've had that clutch/flywheel in the black GT500 since 2010 - and it's had about 50,000 miles of 800hp+ - and it just now starting to slip a little.

Here are some examples of the original 2007 GT500 clutch/flywheel after less than 5000 miles.

Here are pics from today of the 2010 GT500 clutch/flywheel pulled out of my 2007 GT500 after over 50,000 miles.
I'm now about to install the 2013 clutch/flywheel combo - which I'm told has some additional improvements. Once done with that - I will do the same with the white 500 before it develops the problem and make it easier to drive.
You're replacing a clutch that is working fine?
 
#5
You're replacing a clutch that is working fine?
Of course not. It's starting to slip under power - I was glad it made it thru last season. It wouldn't make it thru another. I'm just amazed at how good it looks - the 2010 clutch material and design is so much better than the 2007-09. That clutch saw many laps at VIR and Summit Pt. Along with many runs on the strip.

The 2013 clutch that I'm putting in requires a little more work. I need to change the master cylinder along with the slave - and the hydraulic line as well.
 
#6
You're replacing a clutch that is working fine?
Oh - you may mean the white car - yes I'll replace that clutch/flywheel too. I wouldn't say it's working just fine - it's working like the original clutch - which is poorly. The car has only 1000 miles on it, but I'm not going to wait til that one goes bad and ruins the tranny synchros as well. re:above issues with black car.

I guess it's news to most here, but the original 2007-09 GT500 clutch/flywheel created tons of problems for most owners the first couple of years. If you ever by one used - always ask if the 2010 clutch was installed.
 
#7
Here's the other side of the 2010 twin-disc that's coming out. Again - over 50,000 miles of 800hp+. This is the best clutch I've had installed. At one point - I also had a Spec Supertwin p-trim - it was terrible. Almost off/on operation - and it rattled - all "normal".
 
#9
Here's the 2007 master cylinder next to 2013 on the right. I believe it pushes a greater volume of fluid for a greater throw-out. The hydraulic line (no pic) gets replaced with this change as well - tho there is nothing noticeably different to the eye. I'm told the i.d. is greater.
 

Hot Rod

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#12
The larger diameter clutch would result in a larger friction surface area and larger moment arm which would in turn result in a significant increase load carrying capability for even the same friction material. I'm not surprised the new one is better.
 

Scott Harrison

"Growing old is mandatory, growing up is optional"
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#13
I can't tell from the photos, but the new one does not appear to be a dual disc. If so the friction material on the old dual disc is twice what appears in the photo.
 
#16
The larger diameter clutch would result in a larger friction surface area and larger moment arm which would in turn result in a significant increase load carrying capability for even the same friction material. I'm not surprised the new one is better.
Yep. Not only larger diameter, but more friction material as well. The old disc had patches of material covering maybe half the disc surface. The new disc has material the full 360. The disc springs function better, no chatter, no jerkiness, just smooth application. What's interesting, there are still 6 disc springs, tho 2 of the 4 springs visible are dual spring. Comparing the disc springs, the 2007 has 6 shorter springs with thicker spring steel. The 2010 has 6 longer springs with thinner spring steel. That may explain the improvement...
 
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