mafd2

Yea then if it's just with a load probably drive line related. Pinion angle or trans. Weird how it's just in the steering wheel.

If the problem is just in the steering wheel it's probably tire related. Either out of round or balance. Try having them road force balanced with someone who knows how to road force. A good tech who knows road force balancing can get it spot on. 4 years back, I had a shake in my steering wheel, had tires road force balanced and they still had a shake. I brought them to another shop to have them road force balanced and "voila" the shake was gone. This guy was a wiz at road force balancing. He rotated the tires on the rims at a time to get the best balancing on the worse ones. The guy at the first shop didn't do anything like that and probably didn't know what he was doing. It all has to do with the tech and him calibrating the machine, and installing the weights in the correct locations. The road force machine also detects side to side wobbling in addition to vertical vibrations so the tech can know whether the weights should be on the inside, middle, or outside edge of the wheel. Doing this also eliminates the directional pull of the tire, in addition to eliminating vibration. The road force machine puts a roller on the tire with about 1400 pounds of force which is somewhat close to the weight that will actually be on the tire. Road force checks radial and lateral forces and is more accurate than standard balancing. The key is to find a good tech to do it right.

My 14 Sierra was in the shop for a whine in the differential on acceleration between 57-60 mph. The backlash was 0.013. The tech tried to shim it and bring the backlash within factory spec of 0.002-0.005 but couldn't get it any closer than 0.008 trying different shim kits. The tech also said the teeth weren't tracking quite right and even the whine wasn't as bad as before, he wasn't satisfied so he ended up changing the ring and pinion and bearings. Preload was set and backlash is 0.004 using the original shims. Now the truck has no whine and is quiet as it should be. I don't know if the preload and backlash wasn't set up correctly from the factory (GM may be lacking in this area) or if the ring and pinion was defective. Whichever, I'm satisfied now. So then here's the point I want to make. While my truck was being worked on, they let me use a new Sierra SLE with 31 miles on it. I've just recently started keeping up with this thread so when I brought the loner truck back today, I decided to test it on the interstate. When I got around 70-75 shake and bake started! The console was shaking and a WalMart bag I had on the front seat was shaking away! It was awful. There was no comparison in how the loner truck rode compared to mine. As of today, I have had no shakes or vibrations and have driven it up to 85 mph. It's really smooth. The loner truck was a V6 2wd double cab with a 3.23 ratio and my truck is a 5.3 crew with 3.42. So it's just to say it doesn't matter if you have a V6, V8 or what ratio to get the shakes. I've read that drive shafts, shocks, tires, wheels, pinion angles and other things have been blamed with some getting results and some not. I don't know but I'm thinking something in the transmission or transmission area (maybe the transmission cross member like stated in a previous post). Whatever the culprit, I hope it's found and fixed.

Well said TR24. I wish you the best on whatever happens.

Don't be surprised. GM hasn't discovered the problem. I'm sure you're aware that parts from 14 will be carried over to 15 as they will be the same. So then for "example" lets say it's something in the tranny and being GM hasn't found the source yet to pull the defective item from inventory or stop the mfg process, the parts will float over to the 15 models. Unless the problem is found, shake and bake may be here for sometime.

Keep us posted.

It's funny why one of those GM customer care reps hasn't chimed in lately??? After the first few posts it was like " sorry to hear you're having problems if there's anything else I can do please let me know". The only thing these members want is their truck fixed can you help them with that? No because you have now mechanical knowledge what so ever so why tell them if there's anything else I can do please let me know. Why don't you forward all 212 of these pages to the appropriate people from GM and do something about these 355 hp vibrators? Are you there Jennifer? Do you see this is a problem???

Sorry it double posted.

Lol!!! That's the stupidest most asinine response I've ever heard! So why does GM make a 450 hp Vette with a top speed of 195 mph and a 505 hp Camaro Z28 with a top speed of 185? Do they design those cars to shake @ 70+ and don't care because it's against the law to drive them that fast? Now I've heard it all...

Wondering how many others filed a lemon law? How will anyone know if they are trying to correct the problem or will? What's to say the drivetrain parts or whatever is causing the problem won't be carried over to the 15's? I'm sure they have a stock of drivetrain parts they will use up before the problem is fixed.

Wow... that's f**K** nuts! How isn't the problem being found yet? How long will this crap go on? Geez...

Post the link to file a complaint then hopefully those having issues will file.

I have a Sierra SLE which doesn't have the LED DRL's. The Sierra uses high and low beam in the same bulb. So, I'm wondering if the BCM is different than the Silverado???

Where's G on the plug? I see A,D,E &H.

Anyone ever figure how to disable DRL's? Does a tech have to do it through BCM and will they do it? Thanks