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Issue with GM on Lowering C7

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Old 09-08-2017, 07:57 AM   #1
rlhunter58
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Default Issue with GM on Lowering C7

2018 Stingray
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Old 09-08-2017, 08:00 AM   #2
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2018 Stingray
was that a question or a statement?
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Old 09-08-2017, 08:02 AM   #3
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I recently took delivery of a 2018 Stingray. I had it at the dealer for a minor fix to the stripes from the factory. While at the dealer, I asked if they would lower it and do a realignment. The dealer contacted GM about this. Later, the GM Brand Manager called the dealer and told them that the warranty on the suspension would be voided if I lowered the car. I understand that the brand manager said that cracking in the spring could result. Anyone have any insight into this issue?

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was that a question or a statement?
Sorry, new to the forum. I just replied to my own start of the thread.

Last edited by Steven Bell; 09-08-2017 at 09:44 PM. Reason: Merged Posts
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Old 09-08-2017, 09:21 AM   #4
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Never heard of one when lowered on the stock bolts other than cracked splitters, etc. from ground contact, but that's not a warranty covered item anyway.
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Old 09-08-2017, 10:00 AM   #5
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Welcome to the forum, but you also started a 2nd identical thread, which was unnecessary, and contrary to forum guidelines. I answered in your other identical thread.
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Old 09-08-2017, 10:34 AM   #6
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Welcome to the forum. As Foosh says I haven't heard of any problems other than the splitter.
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Old 09-08-2017, 11:48 AM   #7
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I lowered many c7s and never an issue
On stock bolts
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Old 09-08-2017, 12:01 PM   #8
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I have merged the two threads and deleted the pissing contest
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Old 09-08-2017, 01:11 PM   #9
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YMMV, but lowering it is the last thing I would want to do. It already scrapes coming out of a parking lot or over a speed bump. Slow and angled helps reduce this, but it does not eliminate it. I can't imagine what would happen if it were lowered even more. Why do you guys want to do this?
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Old 09-08-2017, 01:12 PM   #10
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It's a built-in factory adjustment if done with stock bolts. I don't see how GM can possibly justify voiding the warranty.
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Old 09-08-2017, 01:24 PM   #11
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Quote:
Originally Posted by mschuyler View Post
YMMV, but lowering it is the last thing I would want to do. It already scrapes coming out of a parking lot or over a speed bump. Slow and angled helps reduce this, but it does not eliminate it. I can't imagine what would happen if it were lowered even more. Why do you guys want to do this?
Cause they like hearing the splitter scrape
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Old 09-08-2017, 01:39 PM   #12
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Quote:
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It's a built-in factory adjustment if done with stock bolts. I don't see how GM can possibly justify voiding the warranty.


Unless you are replacing or modifiying (cutting bumpers) components to lower the car, the Brand Manager is full of it.

Just turning the adjustment bumpstops isn't going to void anything.
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Old 09-08-2017, 01:41 PM   #13
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I've lowered my Grand Sport and I have not scrapped at all, so I guess it really depends on where you live.
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Old 09-08-2017, 01:43 PM   #14
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My only issue (that may need to be publicized) is that GM will apparently void the warranty on the suspension if lowered. I have owned every generation since my first C3 and lowered them all. I never knew there would be a potential warranty issue.
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Old 09-08-2017, 01:46 PM   #15
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Quote:
Originally Posted by mschuyler View Post
YMMV, but lowering it is the last thing I would want to do. It already scrapes coming out of a parking lot or over a speed bump. Slow and angled helps reduce this, but it does not eliminate it. I can't imagine what would happen if it were lowered even more. Why do you guys want to do this?
Because it looks better, the ride height is way too high from the factory, IMO.

The scraping issue isn't that big of a deal, it's only scraping the plastic air dam up front, and if it's bothersome, remove that air dam.

I plan on lowering my C7 as low as I can go with the aftermarket lowering bolts that I have already bought, but I have also instructed the dealer not to install the plastic air dam when my car arrives off the transport truck. So I don't anticipate any problems even at a much lower ride height from stock. My C6 is as low as it can go on stock bolts and the only thing that scrapes is the plastic air dam.
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Old 09-08-2017, 01:50 PM   #16
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Originally Posted by rlhunter58 View Post
My only issue (that may need to be publicized) is that GM will apparently void the warranty on the suspension if lowered. I have owned every generation since my first C3 and lowered them all. I never knew there would be a potential warranty issue.
Since the stops are not marked from the factory as to position, I don't even know how GM would know they've been adjusted.

Clearly, if you cut bumpers or replace components to get the car lowered, you'd be ripe for a warranty block on suspension.

But a block just for turning the factory adjusters within their normal adjustment range? Not happening.
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Old 09-08-2017, 03:49 PM   #17
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Because it looks better, the ride height is way too high from the factory, IMO.
I just measured and my height floor to bottom of car is five inches. What are you folks lowering your cars to? What's the optimum height that makes it "look better"?
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Old 09-08-2017, 04:23 PM   #18
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I just measured and my height floor to bottom of car is five inches. What are you folks lowering your cars to? What's the optimum height that makes it "look better"?
For me it's not so much the distance at the bottom of the car but the huge gap between the top of the tire and the fender. When I see new C7s on dealer's lots, that gap is usually around 4 fingers. For my liking I would prefer it to be closer to one finger gap (my C6 has about a two finger gap right now). If you go on the Chevy website, take a lot at the images they have for the C7 and almost all of those cars sit lower than the ones that come out of the factory.
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Old 09-08-2017, 04:32 PM   #19
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FYI just checked the gap. Both front and rear are about 2-1/2 fingers. 3 won't fit and 2 is very loose. It's a vert, f that makes any difference.
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Old 09-08-2017, 04:49 PM   #20
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Quote:
Originally Posted by mschuyler View Post
FYI just checked the gap. Both front and rear are about 2-1/2 fingers. 3 won't fit and 2 is very loose. It's a vert, f that makes any difference.
When you are checking this, are you keeping your fingers pointed straight or on an angle? I just checked my C6 once more and if I keep my fingers straight, I have a one finger gap up front and 2 in the back. If I angle my fingers, it ends up being 2 up front and 3 in the back.

So I guess I'd actually like my C7 to have a little bit less than one finger gap up front and about one out back, that will be my goal once I get the lowering bolts installed.

Last edited by Patman; 09-08-2017 at 04:49 PM.
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