2018 Premier w/transmission issues.

[conquer1]

I would take Nick's advice. I personally understand where you are coming from - paid for warranty coverage etc. But if you want longevity see if you can work out paying the difference for an upgraded converter and if they will "flip the pill" on the trans cooling lines.

I've got 100k+ hard miles on my Burb and I fully believe the upgraded converter, the removal of the temp valve, and fluid and filter changes every 25k keep the trans in top shape. Has never had the shutter and there hasn't been a spec of metal in any of my fluid changes.

Sounds like a great truck so best of luck with it.

That's a good idea. I wouldn't mind paying the difference in the upgraded converter. It is a great truck, and we love everything about it.

How many miles did you have before you upgraded the torque converter?

 

[Doubeleive]

Actually there are no stipulations on where it has to be taken, as long at the warranty work is done by a Chevy dealership. They cover any warranty work as long as your vehicle is in the US or Canada.

Vehicle was paid for with cash, and they have no stipulations on using their financing, either.

I also don't have to have it serviced there. We us an independent shop, and had the 95,000 mile service done at the independent shop. I've already confirmed that the warranty work on the transmission will be covered, once I get it to them on my appointment date.

In terms of them making up the price of the warranty by having a higher price, I just looked up 2018 Premiers with less than 100k within 200 miles of where I am, and I paid less than the price of every one of those vehicles, even the ones that have mileage closer to 100.

I also have several neighbors that have bought used vehicles from the same dealership, and haven't had any issues with getting warranty work done. There is literally no fine print on their warranty agreement. It's pretty straightforward.

They even put it on their website, and it's the same warranty agreement given to the customer and signed by a rep at the dealership:

Explore Manager’s Special Offers | Chevrolet Buick GMC of Murfreesboro

Learn more about the Lifetime Warranty available from Chevrolet Buick GMC of Murfreesboro on all new GM vehicles and select pre-owned vehicles. Get a Lifetime Warranty with your new Chevy, Buick or GMC vehicle in Murfreesboro and Nashville.

www.chevroletbuickgmcofmurfreesboro.com

looks like a decent warranty, there getting it from someone...... does it say who the underwriter is?

 

[conquer1]

looks like a decent warranty, there getting it from someone...... does it say who the underwriter is?

I'd have to check to see who the underwriter is.

 

[Doubeleive]

I'd have to check to see who the underwriter is.

you could probably find out by googling the phone number that you call to file a claim

 

[Bigburb3500]

@NickTransmissions - I was wondering if you could give a quick synopsis on the different improvements from the 6L80 v 6L90 v 8L90 v 10L80/90. Did GM take back steps back as the years went on or there just unique issues with each?

If you had to build your perfect GM vehicle, what mechanics would it have?

 

[NickTransmissions]

@NickTransmissions - I was wondering if you could give a quick synopsis on the different improvements from the 6L80 v 6L90 v 8L90 v 10L80/90. Did GM take back steps back as the years went on or there just unique issues with each?

If you had to build your perfect GM vehicle, what mechanics would it have?

I could but it wouldn't be quick or a synopsis, esp if we're talking about the perfect vehicle, haha (ie one that never requires maintenance, always works and makes coffee for you in the AM).

I'm not familiar with the 8 or 10 speeds apart from what we all know about them so can't comment on them too much. Insofar as the six-speeds, the 6L90s are stronger in three key areas: planetary carriers (six-pinion front planetary and wider planetaries in the rear gear set), clutch disc/steel counts (the HD/HP 6L90s have one more friction and steel in each pack) and output shaft (6L80 = 32 splines; 6L90 = 29 splines, large dia shaft or 36 splines).

Hydraulics as well as command and control components are the same between them; things like drums, hubs, shafts, parking rod assy, etc are longer in the 6L90 vs the 6L80 thus not making those parts interchangeable between the two transmissions.

Hope that helps...

 

[Bigburb3500]

I could but it wouldn't be quick or a synopsis, esp if we're talking about the perfect vehicle, haha (ie one that never requires maintenance, always works and makes coffee for you in the AM).

I'm not familiar with the 8 or 10 speeds apart from what we all know about them so can't comment on them too much. Insofar as the six-speeds, the 6L90s are stronger in three key areas: planetary carriers (six-pinion front planetary and wider planetaries in the rear gear set), clutch disc/steel counts (the HD/HP 6L90s have one more friction and steel in each pack) and output shaft (6L80 = 32 splines; 6L90 = 29 splines, large dia shaft or 36 splines).

Hydraulics as well as command and control components are the same between them; things like drums, hubs, shafts, parking rod assy, etc are longer in the 6L90 vs the 6L80 thus not making those parts interchangeable between the two transmissions.

Hope that helps...

It does! Thank you and definitely good info for us all.
Happy New Yr!

 

[conquer1]

Update on my transmission situation...

Had my appointment at the dealership on 1/7. Their tech said that I needed a new transmission. They contacted the warranty company, and the warranty company sent out an inspector to check out the transmission. Inspector did their inspecting yesterday, 1/13, and agreed that it needs a new transmission.

I asked about upgrading the torque converter, and of course the warranty company will only pay for the new, complete transmission. I offered to pay for the upgraded torque converter out of pocket, and was told that it would void the lifetime warranty on my transmission.

Right now, I'm going to be out of pocket $100 for the deductible for the new transmission. If (when) it goes out again, it will just be another $100 deductible. So, if the warranty company wants to keep replacing it, I guess I'll just keep paying the $100 to get new transmissions...

The new transmission has been ordered, and might be put in by the end of the week, or the beginning of next week. Hopefully this transmission will last more than 6 months before it needs replacing.

 

[kurtibm]

KOOLER KLEEN Transmission Cooler & Line Flush with NEW 2-in-1 Fitting - Lubegard

www.lubegard.com

KOOLER KLEEN RETURN LINE CHART

 

[Ibustbravo]

I bought this 2018 Tahoe Premier in August of this year, w/94k on the odometer. The Chevy dealer gives a lifetime warranty on engine and transmission on all vehicles under 100k.

Carfax showed that the previous owner had the transmission replaced in June of this year. So I figured with the new tranny and lifetime warranty, I shouldn't have to worry too much about transmission issues, if any, for a while. Well last week (with 101k on the odometer now), I started to get the dreaded "shudder". Felt like I was driving on rumble strips at times, and the transmission would shift a little hard sometimes.

I made an appointment to see the dealer. Appointment is 2 weeks out.

So I was driving it yesterday, and it seemed like it was back to normal. No issues. Then it started to have a hard time changing gears. Then it got stuck in a gear and wouldn't change at all. Called tow truck and had it towed home.

Is there ANOTHER new transmission in store for this Tahoe, or do you think it's a smaller problem (torque converter)?

This thread is still going so I thought I'd put in my 5c (my cents have been adjusted for inflation) I've been through the entire gambit. My Denali transmission and engine failed immediately after the warranty expired. A new turnkey long block 6.2 runs about 14 K.. A used turnkey long block runs about 6k now.. I got an entire used powerplant; ecu's + harness connected to an engine and trans for 6K. I forget the mileage, it was low.

Thats still cheaper than a new vehicle.. Or a used running one. I should have saved a ton of $ and used a 5.3... But I digress..

I rebuilt the ebay engine and stock trans and then reprogrammed the trans with bluecat to not lock the converter up until 50mph and zero'd out the slip. It's been about 15K now no issues. I still have an 8L90 left over from that job. Maybe I'll put it in my F350 when that engine dies..

My point is, reprogram the trans so it's not always slipping the converter. I know you have a warranty but I think it's stock programming that's the problem, not the hard parts themselves.

 

[conquer1]

This thread is still going so I thought I'd put in my 5c (my cents have been adjusted for inflation) I've been through the entire gambit. My Denali transmission and engine failed immediately after the warranty expired. A new turnkey long block 6.2 runs about 14 K.. A used turnkey long block runs about 6k now.. I got an entire used powerplant; ecu's + harness connected to an engine and trans for 6K. I forget the mileage, it was low.

Thats still cheaper than a new vehicle.. Or a used running one. I should have saved a ton of $ and used a 5.3... But I digress..

I rebuilt the ebay engine and stock trans and then reprogrammed the trans with bluecat to not lock the converter up until 50mph and zero'd out the slip. It's been about 15K now no issues. I still have an 8L90 left over from that job. Maybe I'll put it in my F350 when that engine dies..

My point is, reprogram the trans so it's not always slipping the converter. I know you have a warranty but I think it's stock programming that's the problem, not the hard parts themselves.

Thanks. I'll look into that!

 

[NickTransmissions]

Thanks. I'll look into that!

Make sure you back up the stock tune so you can restore it if the truck has to back for trans or engine warranty work, unless you can confirm a non-stock tune wont void your warranty.

 

[Ibustbravo]

Make sure you back up the stock tune so you can restore it if the truck has to back for trans or engine warranty work, unless you can confirm a non-stock tune wont void your warranty.

There is a change log history in the ECU and this can be found using the GDS software and a J2534 pass through device.. Yes it will void the warranty the change in code will show up. Also, there is a bulletin that shows you how to check for this change log. Will they check? Probably... It's their duty to.

I wanted to break the cycle. **** a warranty if they're not going to address the root cause. That doesn't make a damned bit of sense.

 

[RST Dana]

There is a change log history in the ECU and this can be found using the GDS software and a J2534 pass through device.. Yes it will void the warranty the change in code will show up. Also, there is a bulletin that shows you how to check for this change log. Will they check? Probably... It's their duty to.

I wanted to break the cycle. **** a warranty if they're not going to address the root cause. That doesn't make a damned bit of sense.

My dealer offers a lifetime powertrain warranty which covers trans. The service mgr is a friend and since this is not a GM warranty, I never worry about it. Once I traded back a 16 that had a Blackbear tune installed and the next owner got it included!

 

[Ibustbravo]

My dealer offers a lifetime powertrain warranty which covers trans. The service mgr is a friend and since this is not a GM warranty, I never worry about it. Once I traded back a 16 that had a Blackbear tune installed and the next owner got it included!

Yea, you have a sweet deal. My expectations weren't met. The truck had issues right out of the gate and I feel the dealership took advantage of my lack of knowledge on the problems these vehicles have. it cost me a lot of $ and heartache. They jerked me around on the warranty initially with the air cond, it's worth mentioning that has gone out twice. Both times it wasn't covered under this expensive warranty I purchased. Then the engine blew up and the trans needed to be rebuilt immediately after.

After the initial anguish passed, I bought the tools and did it myself. The best revenge is success, right? I'm considering specializing in just GM.. I enjoy working on them.