DanMan_S

My local GM dealership has replaced the frames on BRAND NEW UNSOLD TRUCKS, so nothing about that even surprises me.

I'm one of those people that have experienced this exact situation. I've test driven five 2015 and 2016 GMC Sierra's and everyone had a bad vibration. I don't know what amount is unreasonable, but I do know that my 7 year old Silverado had a silky smooth ride compared to these new ones. And that scared me out of upgrading, I'm just not going to take a chance on having to fight with the dealership or GM on the vehicle, especially since we don't have lemon laws up here in Alberta. If I had experienced a truck that didn't have an issue, it may be a different story, but I haven't seen one yet.

It'd be nice to be able to nudge the transmission into different gears as you need. My 6 speed makes shifts at the weirdest times. I'll be passing someone on the highway, it'll kick down, and then it'll rapidly shift up...and then shift back down again...while my foot is on the throttle the entire time. And this is in tow/haul mode, with a tuned transmission.

My 2009 6.2L has 125000 km on it now, and it's been tuned since I had 5000 km on it. Tune is definitely not mild as I'm running 93 octane gas, torque management is turned off and the truck will bark the tires shifting into 2nd and 3rd gear. Other mods include headers and exhaust. Drivetrain is still running great, transmission doesn't miss a beat. Had the tranny filter and fluid done awhile back and no issues to report. Tires are a different story, I'm now buying factory takeoff 275/55/20 Bridgestone Alenza tires off of Kijiji/Craigslist since people are effectively giving them away and I'm constantly wearing out my rears, haha.

You mind sharing that good stuff that you're smoking?

I know people that would have this consistently when they would park with their front tires against a parking curb while turned. It would put enough stress on the steering system that it would jam the steering lock and the ignition as a result. It's pretty much normal automotive behavior.

When I had the problem, there were no codes to be pulled. It didn't give a CEL, and my scan gauge would give the all clear when I would try to read any codes.

My 2009 used to do this. Turns out that the fusible link on the firewall was loose and full of grime. I pulled it apart, cleaned the terminals, coated it in dielectric grease, put it back together and the problem never came back.

The current Challenger looks like a classic challenger got stung by a bee and had an allergic reaction. My biggest problem with the challenger is the horrible side profile. Due to being built on the modern charger platform, they had to put the windshield very far forward and it throws off the proportions once you really notice it. They tried to do ALOT of design work to mask it, but once you realize how short the hood is compared to the rest of the car, you can't see it any other way. This is coming from a former Mopar guy that would have killed to get a 70/71 Cuda.

Ford doesn't offer their 3.5L in the Mustang, only the Ecoboost 4 banger, so GM has competing options for all of Ford's engine choices.

Absolutely loving it. I wasn't a big fan of the 5th gen Camaro's which was why I ended up with a Mustang. Couldn't argue with the performance dominance of the ZL1 and the Z28 though. But this car is gorgeous, I'm definitely getting a ZL1 as soon as they are available. Well done GM. And that interior is insane. It's like GM combined the C7 vette interior with a mercedes interior (especially the vents).

You are probably just hearing the fuel injectors. Direct injection engines have very loud fuel injectors due to the high fuel pressure, go listen to any diesel at idle. The 6.0 wouldn't be making the noise as it's still the older engine design and has the fuel injected into the intake manifold. As well, a ram typically wouldn't the noise either as the hemi's aren't direct injected either.

They can definitely stick a long block in it, just happened to a buddy of mine that spun a bearing on his 5.3L. He asked about getting a crate engine but GM provided a long block instead and they transferred over as much as they could.

Excellent post!! My engineering firm does some CFD design of filters & separators for different pipeline applications, so I always get abit annoyed when people call the technology snake oil in a automotive application. As I have detailed CFD results and physical testing data to say otherwise, there is no magic to it, just basic thermodynamics and fluid dynamics.

Wow, I'd say before you criticize people in this thread, you really need to understand how a PCV system works....and the intake system in general. Only one side of the engine? Cleaner valves on one side versus the other? The PCV is just a pressure relief, the problem is that the air you are pulling from your crank case is full of vaporized oil and other hydrocarbons. When it's being introduced into your clean air intake stream, this exposes the valves on both sides of the engine to the oil vapours since it's a unified air intake stream...IE, one intake is feeding both sides of the engine, and you're introducing this dirty air flow to the main stream before it splits up. From an engineering perspective, a catch can is good piece of mind because they are pulling oil that could have been introduced into the intake stream. This cannot be argued, and the visual evidence presented in these threads (and the threads across many other forums for many other manufacturers), demonstrate that the catch cans will collect significant amounts of oil that would have been otherwise introduced to the valves, cylinders and combustion cycle. Catch cans are not a snake oil product. They are a common feature on any air stream where you need the liquids/oils separated out in both automotive and industrial applications. Heck, every compressor I have at home and at my shop has a catch can to pull liquids out of the air. Keep in mind that many of our natural gas pipelines that are crossing the continent have filter/separators that are simply large catch cans on steroids. Whether or not removing that oil will have a notifiable effect on the valve carbon build up is a source of many debates, but I'd rather be safe than sorry. As I don't have a direct injection engine, I can't show any evidence or experiences on my end that there is a impact on the valve buildup, but I am regularly emptying the crud out of my cans on a regular basis. I've also been running them on my vehicles for years now. I don't even run a fancy catch can, I constructed one myself using 1/2" fittings and an air compressor filter/separator, and it does a great job.

The end result of the headers is very dependent on the cat back being used and if you got the headers with/without cats. So on my crew cab, it's very liveable which is why I put on the cutout. I apologize but the only videos I have are with the cutout open. I'll see if I can get some new quiet ones this weekend. But it's definitely the complete opposite of my regular cab which is running the Corsa Sport with American Racing Long Tubes:

I have the Corsa touring on my crew cab, but from the looks of it, they no longer offer it for the new trucks. I'll see if I can get a video this weekend. All of my current ones are with the cutout open so it's got a significant bark to it. With my 2009, I did run the long tubes with the factory exhaust for awhile and I wasn't happy.. The factory muffler isn't designed for headers so it droned like crazy. The headers and the corsa touring was actually quieter in comparison.

If you just want the noise, you can easily run headers without a tune. It will flip a CEL on a regular basis for cat efficiency, but some sort of scan tool can easily clear that.

With the right catback set up, headers can be extremely quiet. The headers + corsa on my crew cab is nearly as quiet as stock when daily driving. It was actually too quiet for me so I put an exhaust cutout in to wake it up abit.

Plus they don't even offer the dual exit systems for the 6.2L anymore, just the single exit ones.

Nope, it's definitely Corsa. From the looks of it they no longer offer the Touring mufflers. It does show up for some of the older trucks on their website:

If you want something quieter, it's worth looking at the Corsa Touring muffler. I have the Corsa Touring + Headers on my 6.2L crew cab and it's extremely reasonable. Very little noise, no drone, when cruising around it's quieter than stock. It has a pretty nasty bark when you get on the gas, but overall it's a pretty mild setup. I ended up putting in a cutout to crank it up bit whenever I'm in the mood to wake the neighbours.

If you're finding it too loud stock, then you're definitely in for a shock with headers. When I put the Corsa Sport on my truck, I thought it was way too quiet with the factory manifolds and the volume with headers was just right (loud, but what I was looking for).

I've had family members that have used the CAMVAP process and it was painful to say that least. Once it was all said and done, they felt it would have been easier just to trade the vehicle in at a different dealership and save themselves the time and stress.

So I'm a still a big GM fan, and have been on the fence about buying a new truck because of some of the threads on this forum. Today I went by my local GM dealership to look at some new trucks. Of the 4 that I test drove, 3 of them had a serious, serious vibration at highway speeds. I test drove different trucks since they didn't have one that had the combination of all of the options I wanted. They told me that the vibration was from the tires flat spotting from sitting too long. This wasn't the first time I've test driven a new vehicle so I rolled my eyes at that comment as that didn't seem to be an issue problem for the 4th truck. I figured that this thread was a very small snapshot of the over owner experience, but test driving 3 duds like that back to back has put a seriously sour taste in my mouth. The biggest concern for me is that because of the options I want, fire red, crew cab, SLT, 6.2L, 8 speed, NHT, no moonroof, that I definitely have to factory order the truck I want. Waiting a few months just to potentially end with a truck that will be a warranty nightmare is not sitting well with me. Especially since we don't have lemon law protection up here in Canada. C'mon GM, get your shit together. I feel like I'm in denial trying to defend an abusive relationship.