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Torque Tube bushings

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Old Dec 4, 2008 | 01:22 PM
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Default Torque Tube bushings

I am in the middle of replacing my flywheel / clutch / pressure plate etc. I am planning to replace all of the hydraulics as well. After reading several of the posts on here recently I am thinking about replacing / upgrading the TT bushings. Couple of questions:

How can I tell if they are good; bad or going?
Where can I get upgraded parts?

Current power levels are 467 RWHP 413 RWTQ

TIA
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Old Dec 4, 2008 | 01:58 PM
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Originally Posted by LDB C5
I am in the middle of replacing my flywheel / clutch / pressure plate etc. I am planning to replace all of the hydraulics as well. After reading several of the posts on here recently I am thinking about replacing / upgrading the TT bushings. Couple of questions:

How can I tell if they are good; bad or going?
Where can I get upgraded parts?

Current power levels are 467 RWHP 413 RWTQ

TIA
Typically, you will find cracking around the metal inserts(like I found on mine). Based on a recommendation from RPM, I replaced my bushings with BMW bushings. Got them right from the BMW dealership on Golf road.
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Old Dec 4, 2008 | 02:13 PM
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I agree with the inspection.

Typically you will see the rubber coming apart around the steel inserts that the bolts go into. If it is really bad you will see the rubber separated.

Also check the center 'doughnut' around the shaft for marks of it hitting the inside of the housing.

Anthony
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Old Dec 4, 2008 | 02:26 PM
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Take a look at these pics..........you can tell

http://forums.corvetteforum.com/c5-t...a-suprise.html
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Old Dec 4, 2008 | 03:33 PM
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I will make sure that I check them when I have the TT out

My car is a 2001; will I need 10mm or 12 mm?
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Old Dec 4, 2008 | 04:53 PM
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Originally Posted by LDB C5
I will make sure that I check them when I have the TT out

My car is a 2001; will I need 10mm or 12 mm?
Measure the bolt size to double check, but this is my understanding:

97-2000, manual, 10mm
97-2002, auto, 10mm
2001-2002, manual, 12mm

Sorry, my parts manual only goes up to 2002.
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Old Dec 4, 2008 | 05:01 PM
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All Z06 cars should be 12mm, as well as C6.

2001 is an odd year, double check the size of your bolts before ordering.
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Old Dec 5, 2008 | 02:51 PM
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More details on the years........

http://forums.corvetteforum.com/c5-t...-round-ii.html
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Old Dec 5, 2008 | 03:10 PM
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It is also a good time to upgrade the tunnel plate if you haven't already. I forgot to do mine when I was doing my clutch.
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Old Dec 5, 2008 | 03:35 PM
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Originally Posted by Anthony @ LGMotorsports
I agree with the inspection.

Typically you will see the rubber coming apart around the steel inserts that the bolts go into. If it is really bad you will see the rubber separated.

Also check the center 'doughnut' around the shaft for marks of it hitting the inside of the housing.

Anthony
What does contact between the doughnut and the housing indicate? I have my TT apart right now, and I do see some indications that the doughnut has contacted the inside of the tube. There are no obvious problems with the couplers, but I haven't take them off yet. I understand that the driveshaft can whip at high RPM and contact the housing, but short of upgrading to a carbon shaft, what should I do? Replace the couplers? Balance the shaft? Replace the bearings? The only local shops I could find said they could only balance the center portion of the shaft, not the whole assembly.
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Old Dec 5, 2008 | 03:38 PM
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Originally Posted by Numb
What does contact between the doughnut and the housing indicate? I have my TT apart right now, and I do see some indications that the doughnut has contacted the inside of the tube. There are no obvious problems with the couplers, but I haven't take them off yet. I understand that the driveshaft can whip at high RPM and contact the housing, but short of upgrading to a carbon shaft, what should I do? Replace the couplers? Balance the shaft? Replace the bearings? The only local shops I could find said they could only balance the center portion of the shaft, not the whole assembly.
Really, it indicates that it has done exactly what it is designed to do. That snubber is there to protect the driveshaft if the transmission has been downshifted at a high speed (or as GM puts it "higher than recommended" speed).
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Old Dec 5, 2008 | 06:16 PM
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Originally Posted by Numb
What does contact between the doughnut and the housing indicate? I have my TT apart right now, and I do see some indications that the doughnut has contacted the inside of the tube. There are no obvious problems with the couplers, but I haven't take them off yet. I understand that the driveshaft can whip at high RPM and contact the housing, but short of upgrading to a carbon shaft, what should I do? Replace the couplers? Balance the shaft? Replace the bearings? The only local shops I could find said they could only balance the center portion of the shaft, not the whole assembly.
It would be impossible to balance everything but if you do see contact then I would if nothing else check the shaft to see if it is still straight.

If you see contact then you know the shaft has moved, and would increase the load on the couplers, increasing the chance of breaking.

If nothing else placing one solid coupler will reduce it's chances of flex and will give you a more solid driveline.

Of course the carbon has still be the ultimate proven design.
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