Installing a C7 7-speed Trans in a C5 Z06
07-19-2014, 08:53 AM
#41
Drifting
Just because the car is old doesnt mean it isnt a good car!
For starters! Its probably payed off. Its a light chassis and it is really a good looking car!
If you dont like it, get off the thread! This thread is aimed to
People that do! Like myself and many others
For starters! Its probably payed off. Its a light chassis and it is really a good looking car!
If you dont like it, get off the thread! This thread is aimed to
People that do! Like myself and many others
07-20-2014, 09:17 AM
#42
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Amen!
07-30-2014, 08:40 AM
#44
Melting Slicks
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I agree with you about why GM did the 7th speed in the C7. But GM did it wrong. They used the standard MN6 and a modified MN12 gear sets for 1st thru 6th gears, and add a 7th gear for a little more fuel economy. They gave no thought to improving the gear spacing in 1st thru 6th gear. They gave no thought to installing a performance differential gear set.
But I did!
I did the change for three reasons:
1) I did not want to lose unnecessary RPMs on the 5th to 6th shift, so I can achieve 200 mph at 6,300 RPMs in 6th gear.
2) I wanted the 19.88% improved rear wheel torque that a 4.10:1 final drive ratio gives me.
3) I wanted the improved fuel economy that a 0.42:1 7th gear gives me.
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Last edited by Pumba; 07-30-2014 at 06:32 PM.
12-05-2014, 06:19 PM
#46
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I am sure U had your reasons but did you consider just buying a stingray with the 7spd. already in it or did it not meet your expectations, just curious? Awesome project to take on and you did and comleted it with the results you wanted. As we say in the South,"If you can't run with the big dogs, stay on the porch." I will be on the porch, Ha. Congrats
12-05-2014, 06:50 PM
#47
Melting Slicks
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I am sure you had your reasons, but did you consider just buying a Stingray with the 7-speed already in it, or did it not meet your expectations? Just curious.
Awesome project to take on, and you did, and completed it with the results you wanted. As we say in the South, "If you can't run with the big dogs, stay on the porch."
I will be on the porch. Ha! Congrats.
Awesome project to take on, and you did, and completed it with the results you wanted. As we say in the South, "If you can't run with the big dogs, stay on the porch."
I will be on the porch. Ha! Congrats.
Have you taken the time to sit in a new C7 Stingray or Z06? I have, and it is too small. At 6'3", with the seat all the way back and the seat back reclined into the rear bulkhead, my head hits the roof reinforcement bar. When I tried to get out, my head hit the roof panel on the left.
GM made the C5 with 28 cubic feet of interior room. The C6 was reduced to 25 cubic feet, and the C7 has been reduced to 15 cubic feet. One of the National Corvette Museum's Board of Directors, Joe Thomas, stated that he could not drive a C7 manual trans vehicle because it was too small to accommodate his 6'5" frame. The front 3/4s of the C7 is a great looking vehicle, but GM's decision to make the exterior larger, while making the interior smaller led me to keeping my C5 Z06.
Last edited by Pumba; 12-06-2014 at 10:47 AM.
12-06-2014, 12:02 AM
#50
Drifting
I finally test drove a 7 speed C7 last week. The shifter is soooooooo much better than my C5 shifter it's ridiculous.
I'm super jealous of Pumba's swap, the car must be a blast to drive.
I'm super jealous of Pumba's swap, the car must be a blast to drive.
12-08-2014, 01:04 PM
#51
Melting Slicks
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Great writeup, thanks for the info.... When we moved to a CF driveshaft we did one solid coupler, and one rubber to keep the NVH down. That seemed to be enough to make the drivetrain happy.
I would also say that before installing the clutch/FW that you could also check the balance. What is "acceptable" tolerances can sometimes be enough to induce some drivetrain harmonics as well. Especially in a use case like that.
But it sounds like you have found a solution that more closely mimics the factory design, and resolves your issue. So, good luck with all the new gears...
I would also say that before installing the clutch/FW that you could also check the balance. What is "acceptable" tolerances can sometimes be enough to induce some drivetrain harmonics as well. Especially in a use case like that.
But it sounds like you have found a solution that more closely mimics the factory design, and resolves your issue. So, good luck with all the new gears...
12-08-2014, 01:20 PM
#52
Melting Slicks
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Great writeup, thanks for the info.... When we moved to a CF driveshaft we did one solid coupler, and one rubber to keep the NVH down. That seemed to be enough to make the drivetrain happy.
I would also say that before installing the clutch/FW that you could also check the balance. What is "acceptable" tolerances can sometimes be enough to induce some drivetrain harmonics as well. Especially in a use case like that.
But it sounds like you have found a solution that more closely mimics the factory design, and resolves your issue. So, good luck with all the new gears.
I would also say that before installing the clutch/FW that you could also check the balance. What is "acceptable" tolerances can sometimes be enough to induce some drivetrain harmonics as well. Especially in a use case like that.
But it sounds like you have found a solution that more closely mimics the factory design, and resolves your issue. So, good luck with all the new gears.
J-Rod,
Thanks for your advice.
We did check the balance on the clutch-flywheel assembly before we installed it on the engine. The C6 ZR1 couplers are more than enough for my power level, and they really quieted down the driveline vibration.
04-15-2015, 08:50 AM
#55
Advanced
Wow! Did I read that right?? 1700 RPM at 76mph w/ 4.10 gears??
That is awesome!!
I would totally do this swap. TY for the awesome writeup
I also didn't realize how much smaller the C7 is inside vs C5.
That is awesome!!
I would totally do this swap. TY for the awesome writeup
I also didn't realize how much smaller the C7 is inside vs C5.
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03-04-2020, 11:50 PM
#59
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07-29-2020, 04:17 PM
#60
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Thank You Gentlemen for explaining trans swap for 6070 (just what my 50 Fastback needs !). JUST FYI the rubber insulators on driveshaft look IDENTICAL (except for size) as the ones on my JOHN DEERE 322 tractor= interesting. 20yrs old