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This is the input shaft for the clutch. It sits on the torque tube instead of the transaxle since the transaxle is a long way back there.

The driveshaft in the torque tube has high-temperature rubber couplers in it, which is an upgrade if your C7 was made before 6/2/2015. After this date, all C7's have the improved high-temperature parts. 

 

This is where the transaxles input shaft plugs into the torque tube.

It is a considerable amount of work to change the torque tube or the clutch, for that matter. So while we were in there, we decided to upgrade our clutch with one that will take any anticipated power modification we can dream up in the future. 

 

We wanted to change the clutch to something that was streetable but still had the ability to contain some serious power on the track. For that job, we chose the McLeod RXT 1200.

The RXT 1200 is a twin disc clutch with the ability to have a decently smooth engagement, a light pedal effort and still contain up to 1200 hp. The RXT 1200 gets away with a light pedal because the twin clutch discs give the clutch twice the friction material area. The clutch diaphragm spring does not have to have seriously heavy clamping force to prevent slippage. 

 

The RXT 1200's pressure plate has a heavy gauge cover to reduce distortion and improve efficiency.

The pressure ring is thick nodular iron for good friction and low distortion, even when hot. The floater plate between the two discs is also thick for distortion-free heat capacity. The pressure plate sits on standoffs, so the clutch's internals are fully exposed. This allows the cooling air to freely circulate and dust can be easily ejected. 

The pressure plate has 2200 lbs of clamping force, which is plenty for a twin disc clutch to have a large torque capacity. Even with this generous amount of clamping force, the clutch has a 4-cylinder like pedal effort, thanks to the ratio of the diaphragm spring on the clutch cover.

A unique feature is that the floater plate is strap driven instead of the typical lug drive. This gives the floater good release separation and prevents it from rattling around. Because of this, the RXT 1200 should be quieter than a typical twin disc clutch, which usually has a characteristic rattle at idle. 

 

Here is the RXT 1200 clutch taken down. The main feature that makes it different from typical twin disc clutches is the strap driven floater.  

The flywheel is a lightweight CNC-machined steel part. The friction surface is replaceable, as is the starter ring gear teeth, which help give the unit complete serviceability. 

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Comments
czubaka
czubakalink
Thursday, January 04, 2018 11:06 PM
How many hours/how much does that take to install?
Mike Kojima
Mike Kojimalink
Friday, January 05, 2018 1:10 AM
Two people all day.
Supercharged111
Supercharged111link
Friday, January 05, 2018 8:28 AM
I've done it twice by myself on the floor with jackstands. I liken it a little to removing fwd drivetrain. The reason for the dual mass flywheel and steel torque tube was to reduce NVH with active fuel management. Have you noticed any harshness when in 4 cylinder mode or do you intend to delete it?
Mike Kojima
Mike Kojimalink
Friday, January 05, 2018 9:31 AM
Not at all. We probably have to get rid of 4 cylinder mode when we change cams later.
Supercharged111
Supercharged111link
Saturday, January 06, 2018 8:20 AM
I'd been wondering how much of a difference it made. My guess is they catered to the old farts that buy Vettes and wax them and take them to car shows and talk about how fast they are instead of using them in a more sporting manner.
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