I have similarly never removed my Z06's top. I hate convertibles,with targas, etc. a close second. My C5 Z06 was thus perfect roof-wise.

Never a single squeak.

 

Ha! I sold my beloved C5Z to buy this Z. You are right, the FRC was super stiff and squeak free...other than the cheap plastic interior LOL!

 

Yesssir.....nothing like the Fixed Roof Coupe on our long-gone terrific 2001 Z06....loved that car....AND, no snap-crackle-pop fix needed !

 

I had the squeak/cracking noise as well. Tried the rubber tire tube trick, o rings, etc. None worked more than a day or so.
I tried silicone grease (dielectric grease,type.) and other lubricants on the roof lever where it contacts the front window frame, and did not work.

I finally tried anti-sieze compound on the lever frame and that worked, but was too messy.
The current solution that has worked without further attention for over a year is wheel bearing grease. You ONLY need about a grain of rice size amount! Just apply on the part of the lever that is in contact with the window frame when the lever is closed. I used mobil 1 wheel bearing grease, but I would think any good quality version would work.
This stuff is designed to be a high pressure lubricant, where the silicone type stuff, wd40, etc are not.

 

Do you remove the top much? Wondering if this is something you need to do every time you R&R the roof. I'm definitely gonna try this. I bought my 14 used and it was totally squeak free on the test drive. About a week after purchase it starting "talking". My previous three generations were totally quiet.

 

On our C5 and two C6's, I used dielectric silicone grease and had to redo it about every 6k miles/6 months.

The second C6 transparent top developed a horrendous squeak at about 80k miles. The dealership couldn't fix it, I couldn't fix it, and none of the suggestions here worked. I tried everything. I finally bought a new top and sold the original to a club member who said it was quiet for him, and the new top stayed quiet for us until we traded the car about 20k miles/2 years later.
Mysterious stuff...

 

When was your 15 built? Mine was built in June of 2015 the day before 2015 production ceased and it had the updated parts. The production break in of the change was sometime around the middle of the 2015 production run so maybe December 2014 or January 2015. No sense purchasing the parts if they won't do any good. The change was made to reduce rattling in 2014 and early 2015 tops. I don't think squeaks count as rattling. Have somebody ride with you and try to locate the squeak while driving over a bumpy road. You may be surprised where it is coming from. You can spend a lot of useless time trying to fix a squeak in the top when it isn't the top squeaking.

Bill

 

I believe the problem is a top/car dimensional issue... my '17 was squeak free with either the painted or transparent top installed... I mean silent as a crypt, to the point when I got my '19 I was surprised at the creaks with either top installed.
I cleaned and lubed the weatherstrip with silicone grease with no improvement. I plan to conduct a fairly rigorous transparent/painted and no roof test when warmer temps arrive, but tiny difference is car dimensions is apparently the source

 

Just a follow up, just removed the roof for a drive the other day. When I got home I put just a little pinch of grease on the small rub blocks on the levers. I used redline synthetic bearing grease, as that's what I use on my race car CV joints and sealed roller bearings. I have it in a little syringe with a small needle. Anyway, just a little bit and smeared it around the block. Absolutely quiet and zero squeaks. Its just been a few days, but so far its great. Thanks for the tip!

 

In the first iteration I used silicone grease (recommended by GM). It is truly nasty stuff that smears itself on any nearby surface leaving a stubborn smudge. After applying it the squeaks were reduced by about a third, but still annoying. Not only is it messy, it didn't work to silence my roof... CF posts led me to try 303 Rubber Protectant and being a long time 303 Aerospace user, decided to give it a go...

I removed the roof and cleaned all mating surfaces and the pins/latches with isopropyl alcohol and a microfiber towel, applied 303 rubber protectant to all mating rubber surfaces on the top and the car body and let it dry 20-30 minutes between each of three coats, with four coats applied to the suspected culprit areas.
I applied a couple of drops of WD40 Dry Lube onto the forward locking lever pivot screws and the rear latch mechanisms.
Recalling that the silicone grease is more accurately named "Mess in a Can", the last step was to CAREFULLY apply small dabs of silicone grease to the locating pins and receptacles and the latch locking surfaces considering those areas to be akin to scorpions when moving and reinstalling the roof. I reckon I cleaned, protected and lubed every possible part of the roof...

I reinstalled the roof and headed off to the washboard surface of one of our nominally maintained streets (e.g. cracks potholes and long ago applied asphalt patches)... SILENCE. Took the car on a Chinese Virus Fun Run up into the hills and returned in about an hour with no squeaks... Cautiously optimistic that this may be a solution.

 

The surprising things about our C6 transparent top squeaks were:
It didn't start until the car had about 50k miles, despite being cleaned & lubed regularly.
Nothing I could do, nor the dealer, nor the GM bulletin, nor any of the suggestions here; could quiet it despite a full year of trying.
When I bought a new transparent top, I installed it with no adjustments and it was quiet.
When I sold the old transparent top to a friend (with a money-back agreement), it was perfectly quiet on his car without any adjustments, and stayed quiet.

Some things are not for us mortals to understand...

Glad yours is quiet now!
Our 2017 transparent top is perfectly quiet at 3 yrs/30k miles, I never put any lube on it until last week when I used the GM WS lube. Hoping that's not a jinx!

 

Removed the top a few times more and did not regrease the blocks. Still quiet and no squeaks!

 

My 2015 Corvette was driving me crazy with the creaking sound. I put latex rubber tubing on the roof panel locator pins and it cured the problem. You can also use O-Rings to get rid of the noise, available at Home Depot or off the Internet.

 

Different noises have different causes. Some are correctable by lubricating the seals, or adding o-rings to the pins.

On my C6 I had a loud popping sound coming from the windshield header directly above me. It sounded like something was binding up, then popping when it needed to move. Knowing the roof is meant to float on rubber, located by its pins, this prompted me to see what happened if I released some tension off the latch above my head. I opened the latch up part way and drove for a while without any popping noises. I got used to leaving that latch partly unlatched as I mentally puzzled the issue.

My eventual solution was a shim. I removed the torx bolt holding the left handle to the roof. Under the handle was a shim with a locator tang. I sourced a thin washer with similar dimensions at my local hardware store and added it behind the existing shim. Reinstalling the top the feel of that handle was noticably different. It had previously snapped shut quite hard. After the added shim it was not quite as hard to close.

I never heard another sound from that top. Silence.

 

The noise in my C7 came from that area (where the roof panel meets the top of the windshield), but I felt like the whole windshield amplified the sound, like a big speaker. Hope that doesn't sound crazy.