GMCSierra4x4

It looks like the vibration saga continues. I traded my truck 3 months ago for a 2016 Ford F150 Crew Cab 5.0L 4x4. It was the best move that I have ever made on a vehicle given my bad luck with GM. I will NEVER own another GM product in my lifetime nor will my son or daughter (their decision) after seeing most of my problem vehicles. -1986 Oldsmobile Cutlass Ciera - Infamous factory paint defect blamed on acid rain -1995 Chevrolet Silverado Extended Cab 2WD - Bucking and jerky engine when warm (61,000 miles). GM lead mechanic told me to trade it when it was running good after 5 failed attempts to diagnose and fix it on my dime. -2001 Chevrolet Silverado Crew Cab 2500HD 4WD - Lemon lawed and bought back by GM despite making every attempt to discredit my case. After they lost the ruling, I was contacted in a last ditch effort to replace the engine so they did not have to buy it back. -2015 GMC Sierra Crew Cab 4Wd - Traded after attempts to fix the vibration issues failed and GM was not interested in finding a solution or admitting a problem. Here is my solution: I wish you guys the best.

Not as bad as I expected.... my GMC truck stickered by 54800, purchased for 43800 through a military buying program, traded for 38500 after a year and 9400 miles. The new Ford stickered for 61200, bought for 52500, but it has every possible bell and whistle that the GMC was missing despite having every package option installed. 38500 trade was the high end per KBB for my truck, so I couldn't have expected more. The most important thing is that Washington state has a 9.2% sales tax on new vehicles. I needed to sell the truck for 42042 just to break even on the sales tax savings gained by trading. It is almost always better to trade a well kept newer vehicle in Washington versus selling it privately just due to sales tax. A $50000 truck without a trade is an additional $4600 in sales tax. I can at least write off the sales tax on my federal tax return next year since Washington does not an income tax.

Do not get aggressive and polish off clear coat. The clear coat is tinted vice clear. I used a Dremel to smooth out small curb rash, polished and touched up clear coat after sanding with 2000 grit. Repair was perfect but the clear coat afterwards left the spot a brighter color of aluminum compared to original.

Well, my days as a GM owner are officially done. I was shaking my head on the way to the dealership or maybe it was just the vibration . I traded my truck for a 2016 Ford F150 Lariat 4WD Crew Cab with 6.5' box. I tried, but no more GM's in my lifetime. -1995 Chevrolet Silverado 2WD - It started bucking and jerky randomly when warm. The mechanics could not find anything wrong after 6-10 visits. I was already outside the 3/36 and 5 year period (73,000 miles). Service manager told me to trade it on a good day which I did the next week. -2001 Chevrolet Silverado 2500HD 4WD 6.0L gas - Lemon lawed at the 3 year point. I started the process at about 2 1/2 years. -2015 GMC Sierra 1500 4WD - Traded I will check back on a more infrequent basis, but wanted to get ahead of the AutoGuide article assuming it affects resale values.

I am trading mine in on a Ford F150 5.0L. I have heard of too many issues with the 3.5 EcoBoost. The new truck has a heavy duty towing package with 3.73 gears, so it has some "get up and go" in it. The transmission shifts smooth too. I have owned a Tundra. They are great trucks, but gas mileage is poor (5.7L with 4.30 gears) and they only have 5.5' boxes on the CrewMax. Best resale value on any truck that I have owned.

My vibration should be resolved in 1-2 days guaranteed. I test drove a Ford F150, Ram 1500 and Toyota Tundra. None of them vibrated above 60 mph. Trading it in on a better option.

I am less inclined to believe that the leaf springs are influencing the vibration since shocks are the primary method of dampening. It may be possible that the pinion angles are off which is somewhat corrected by clamping the leaf springs. Most of the posts favor clamping the springs in the front of the axle which would increase the pinion angle.

Well, it looks like the new transmission, 4x4 transfer case recall and motor mount shims DID NOT fix my highway vibration above 60 mph. It rode much better at the lower speeds.

76 mph would be 13.8 Hz 1st order tire, 41.4 Hz 3rd order tire, 47.2 1st order prop shaft, and 31.5 Hz 1st order 6th gear carrier bearing. I will check for the vibration and if present take some picoscope readings. Thanks.

I am beginning to wonder if this is a transmission and engine driveline issue. My transmission was replaced under PI1450 (snap, pop, clunk on launch) and the motor mounts were shimmed for the vibration at idle. My vibration appears to be gone at lower speeds. I have a business trip later this week and I will get to test it at highway speeds between 60-75 mph. I am keeping my fingers crossed.

Shimming motor mounts, replacing my transmission and replacing a tire with a high Road Force number seems to have resolved most of my vibration issues. I still need to get it on the highway for some extended testing though.

The response reminds me of that old phrase..."that is the way we have always done it" ... in response to an injury or catastrophic failure. Low pressure in LT rated tires causes the sidewalls to heat up more. The fact that most people never have an issue running lower pressures leads to the often tribal knowledge to do it wrong all the time. If you want a less harsh ride, stick with P tires otherwise it is best to operate LT tires as designed. I highly recommend using the P to LT conversion chart to get the right pressure. The chalk method is usually pretty accurate and closely matches the conversion table in my experience.

I recently went to the east coast for a business trip and visited several dealers in my off time. I mentioned that my truck was in the shop on the west coast for transmission replacement, vibration concerns, tires replaced and road force checked. The salesman did not have an reason to be less than truthful since I was clearly not in the market to buy. I spoke with 4 different salesman in a historically truck centric and lift friendly location. All of them acknowledged the vibration problems in the new trucks and stated that the service departments have started checking and applying the simpler fixes before the pre-delivery checks are completed and the truck is put on the lot for sale. One dealer stated that three vehicles had been returned to GM for further inspection over the past year. I am not sure how this process works.