[C2] Bad Vibration
Thread Starter
Le Mans Master
Joined: Apr 2013
Posts: 5,001
Likes: 1,056
From: Arlington TX
2024 C1 of the Year Finalist - Unmodified
2023 Restomod of the Year Finalist
2023 C1 of the Year Finalist - Unmodified
The bolts is about 1/2” from the tire. Not wild about the setup, I don’t like to deviate from stock this much.
Fortunately I can get a repo spring & bolts and it’s not expensive. The main issue is the wheels, they’re almost new so I wonder if I can trade them for stock size, btw, what is stock size?
Fortunately I can get a repo spring & bolts and it’s not expensive. The main issue is the wheels, they’re almost new so I wonder if I can trade them for stock size, btw, what is stock size?
Le Mans Master
Joined: Mar 2009
Posts: 7,992
Likes: 3,974
From: Cold Harbor, VA
Stock aluminum wheels were 15 x 6".
Get your rear suspension back to stock and go to 15 x 6 or 15 x 7 at the largest wheels, with 70 series tires and your vibration likely goes away, unless you have bad U Joints or rear wheel bearings.
Get your rear suspension back to stock and go to 15 x 6 or 15 x 7 at the largest wheels, with 70 series tires and your vibration likely goes away, unless you have bad U Joints or rear wheel bearings.
Drifting
Joined: Sep 2017
Posts: 1,951
Likes: 748
From: CT
I have TT's on my 65, they are 15x7 rear tire size is 235-65-r15, front is 215-60-r15, I fit the largest size I could for a 15 inch wheel, if I wanted a larger rear tire I would have changed to pinched trailing arms, they would give another inch, inch and a half.
Thread Starter
Le Mans Master
Joined: Apr 2013
Posts: 5,001
Likes: 1,056
From: Arlington TX
2024 C1 of the Year Finalist - Unmodified
2023 Restomod of the Year Finalist
2023 C1 of the Year Finalist - Unmodified
Racer
Joined: Jun 2009
Posts: 476
Likes: 82
From: Hartland WI
It may just be my eyes, but your 1/2shafts seem to be at an extreme angle compared to stock. If this has been running like this for lots of miles, you probably have u-joint issues.
I always said, these old vettes look and ride best at stock heights. If you want to jack up a rear end of a car, buy an old Nova with leafs and go nuts!!
I always said, these old vettes look and ride best at stock heights. If you want to jack up a rear end of a car, buy an old Nova with leafs and go nuts!!
Race Director
Joined: Jan 2002
Posts: 15,354
Likes: 2,726
From: Close to DC
C2 of the Year Finalist - Modified 2020
[QUOTE=Bradysdad;1595746075]It may just be my eyes, but your 1/2shafts seem to be at an extreme angle compared to stock. If this has been running like this for lots of miles, you probably have u-joint issues.
I always said, these old vettes look and ride best at stock heights. Or at the very least be level.
Exactly my thought!
Dennis
I always said, these old vettes look and ride best at stock heights. Or at the very least be level.
Exactly my thought!
Dennis
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Thread Starter
Le Mans Master
Joined: Apr 2013
Posts: 5,001
Likes: 1,056
From: Arlington TX
2024 C1 of the Year Finalist - Unmodified
2023 Restomod of the Year Finalist
2023 C1 of the Year Finalist - Unmodified
Yes, I see, big diff! And it rides like a buckboard! So I see they sell a stock (9 leaf) and HD (7 leaf). Which would you chose running a BB?
Safety Car
Joined: Oct 2016
Posts: 4,617
Likes: 1,547
From: Olive branch Ms
I'll just throw this out as food for thought. The pinion angel should match the transmission centerline within one degree, i.e. If the transmission is pointing down 2 degrees the pinion should be pointing up 2 degrees. If they are out it can cause vibrations.
Thread Starter
Le Mans Master
Joined: Apr 2013
Posts: 5,001
Likes: 1,056
From: Arlington TX
2024 C1 of the Year Finalist - Unmodified
2023 Restomod of the Year Finalist
2023 C1 of the Year Finalist - Unmodified
It may just be my eyes, but your 1/2shafts seem to be at an extreme angle compared to stock. If this has been running like this for lots of miles, you probably have u-joint issues.
I always said, these old vettes look and ride best at stock heights. If you want to jack up a rear end of a car, buy an old Nova with leafs and go nuts!!
I always said, these old vettes look and ride best at stock heights. If you want to jack up a rear end of a car, buy an old Nova with leafs and go nuts!!
Got to thinking about what I just wrote. Not home right now, is the rear end attached to the body?
Last edited by 59BlueSilver; Oct 12, 2017 at 07:58 AM.
Race Director
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From: northern california
C2 of Year Finalist (track prepared) 2019
Team Owner
Joined: Jul 2006
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From: Kannapolis NC
If a degree or two matters on a driveline then I would think it would matter on the half shafts as well. I don’t like that angle either. Think I’m going to replace the spring (HD) and U joints and get 15 x 7 wheels. See what happens after that.
Got to thinking about what I just wrote. Not home right now, is the rear end attached to the body?
Got to thinking about what I just wrote. Not home right now, is the rear end attached to the body?
Safety Car
Joined: Oct 2016
Posts: 4,617
Likes: 1,547
From: Olive branch Ms
I did see the severe angle on the half shafts. But the ends are still parallel the centerline of the axles and the rear end are the same. That keeps the u joints in phase. That much angle may still cause a vibration. Anything over 5* is tough on the joint. There is a great video on u joint angles on YouTube.
If you don't want to lower the car all the way get some steel conduit and cut 2 pieces for each side 1/2 the length of the spacer that is below the spring now. Put one below and one above the spring. You'll need some heavy washers to keep the conduit from entering the hole in the spring. This will give you some pivot back at the end of the spring the way it is now there is no pivot action to the bolt. It will also help with the half shaft angle.
If you don't want to lower the car all the way get some steel conduit and cut 2 pieces for each side 1/2 the length of the spacer that is below the spring now. Put one below and one above the spring. You'll need some heavy washers to keep the conduit from entering the hole in the spring. This will give you some pivot back at the end of the spring the way it is now there is no pivot action to the bolt. It will also help with the half shaft angle.
Last edited by Robert61; Oct 12, 2017 at 09:19 AM.
Thread Starter
Le Mans Master
Joined: Apr 2013
Posts: 5,001
Likes: 1,056
From: Arlington TX
2024 C1 of the Year Finalist - Unmodified
2023 Restomod of the Year Finalist
2023 C1 of the Year Finalist - Unmodified
I did see the severe angle on the half shafts. But the ends are still parallel the centerline of the axles and the rear end are the same. That keeps the u joints in phase. That much angle may still cause a vibration. Anything over 5* is tough on the joint. There is a great video on u joint angles on YouTube.
If you don't want to lower the car all the way get some steel conduit and cut 2 pieces for each side 1/2 the length of the spacer that is below the spring now. Put one below and one above the spring. You'll need some heavy washers to keep the conduit from entering the hole in the spring. This will give you some pivot back at the end of the spring the way it is now there is no pivot action to the bolt. It will also help with the half shaft angle.
If you don't want to lower the car all the way get some steel conduit and cut 2 pieces for each side 1/2 the length of the spacer that is below the spring now. Put one below and one above the spring. You'll need some heavy washers to keep the conduit from entering the hole in the spring. This will give you some pivot back at the end of the spring the way it is now there is no pivot action to the bolt. It will also help with the half shaft angle.
Thread Starter
Le Mans Master
Joined: Apr 2013
Posts: 5,001
Likes: 1,056
From: Arlington TX
2024 C1 of the Year Finalist - Unmodified
2023 Restomod of the Year Finalist
2023 C1 of the Year Finalist - Unmodified
Does anyone have a part # and/or a good source for a USA made u-joints for the half shafts, preferably a FLAPS?
Race Director
Joined: Jan 2002
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From: Close to DC
C2 of the Year Finalist - Modified 2020
Thread Starter
Le Mans Master
Joined: Apr 2013
Posts: 5,001
Likes: 1,056
From: Arlington TX
2024 C1 of the Year Finalist - Unmodified
2023 Restomod of the Year Finalist
2023 C1 of the Year Finalist - Unmodified
Safety Car
Joined: Oct 2016
Posts: 4,617
Likes: 1,547
From: Olive branch Ms
Disadvantages, they break. The rear one on my C4 broke about 3 weeks before the warranty went out. The dealer said they weren't going to fix it because I bought it that way. I didn't and asked what difference that would make as it was still under warranty. After a well placed letter they called me back and fixed it. And at the time there were so many broken they were on national back order.