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I purchased my new Colorado 4X2 diesel auto, crew cab pick up on October 7th.
Drove to and from work the first week, was quite impressed with the vehicle.

Then my wife and I went for our first highway drive and, I was shocked at the driveline vibrations.
At 100kmh (60mph) in top gear, with cruise set, as soon as I hit a decent gradient, the vibrations through the vehicle were severe.

I immediately contacted the dealer and, the vehicle was returned to be checked out.

They claimed the problem was a dry slip joint on the driveshaft and, a quick pump of grease and, everything seems fine.
I disagreed and insisted on taking the mechanic for a drive and, I'd demonstrate what was happening.
Yes, he felt the vibration and, agreed it wasn't normal.

The vehicle then went back a second time but, this time they came back with, everything is normal......kinda.
They said they could feel vibrations in all gears under load but, it appeared normal.

Now, I'm an ex mechanic with over 30 years experience and, don't make claims of vehicle vibes lightly.
I know when things aren't right.

I've since been forced by the manufacturer (Holden) to obtain a second opinion, from another dealer of course.
This takes place day after tomorrow, I'll let you all know the outcome.

P.S. I also noted one other owner in the US has posted a video about similar problems so, wondering if this is common or not?
 

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I've have driven mine at speeds over 90 MPH and had zero vibrations, I didn't realize I was going that fast until I looked at the speedo because it drives so smooth.
 

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If your truck is the same as ours, it has a 6l50 transmission. it might interest you to read into the issues they had from that trans in the Camaro. seems like the torque converter lockup rpm is way to high of rpm for the diesels. I haven't had an issue, but my truck won't shift into 6th unless I'm going 65mph plus
 

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I had a vibration at 70+MPH. I noted this after the break-in period when I was able to get over 55. It turned out to be a tire (or tires) in need of re-indexing along with an alignment. Simple enough, but in my humble opinion, this represents an unsatisfactory quality control process at the manufacturer. I have had the little tractor up to about 90 with no real issues. I understand the having four, rather large pistons moving up and down create some unwanted vibrations and that is one reason four cylinder engines are typically limited to 2.5 liters. The low RPM's keep that mass moving relatively slowly in contrast to those little screaming gas motors turning 6-8 K RPM. I really like the truck, but I sometimes feel chevy needed to give in another year of development to iron out some of these issues.
 

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Had an issue with my gmc since purchase, I was not getting bad mileage every other day for the same trip. I knew it was constantly going through a regen cycle and went to two different dealerships that both said there was no issue and that is how these trucks are and wouldn't even look at it. Called GMC and got them involved but the rep assigned to my case was an idiot and that went nowhere so I gave up with talking to her. One day took the wife's car to a chevy dealership just for an oil change and while waiting on them to finish up, I just asked their maintenance about my issue and they said that there was definitely something wrong, so they took my truck in and 3 days later, I had it back and turns out I had a tons of codes on it but no check light on and my def injector was out. I am happy now, but there was a time of constant headaches just from getting blown off by the dealerships who wouldn't even look at my truck and this experience has taught me where I will want to make my future new car purchases.
 

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I had a vibration issue with mine also. It was only at highway speeds from 65 - 80. I was convinced it was a drive line issue. Dealer wasn't much help. It turned out to be the tires. After about 15k miles the vibrations went away completely. I now have 41k on the truck and tires and it is vibration free at any speed. Looks like i will get 50k out of the tires which i thinks is good minus the first 15k. Trying to decide on the next set of tires now. Any recommendations?
 

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I had a vibration issue with mine also. It was only at highway speeds from 65 - 80. I was convinced it was a drive line issue. Dealer wasn't much help. It turned out to be the tires. After about 15k miles the vibrations went away completely. I now have 41k on the truck and tires and it is vibration free at any speed. Looks like i will get 50k out of the tires which i thinks is good minus the first 15k. Trying to decide on the next set of tires now. Any recommendations?
When it comes to tires, any of the big brand will suit you fine. It come down to personal preferences. Do you like the way it look, how aggressive do you want or how stiff of a ride you want. If you want a medium ride, don't go to E rating.

I'm a big fan of General and BFG. The wife like her suburban to ride smooth so we put either Bridgestone Revo or Michelin or continental on her's.

My all time favorite is the General red letter Grabber. I've used them extensively in the past on my Jeep and my tundra. Once my warranty run out, I will switch to whichever rim needed just to get the Red Letter on my truck.
 
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