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I was bouncing around thru a few threads on here, mostly older. and saw somebody had the same issue i seem to be having, well many seem to be having, with the Diesel and 6spd transmission. Traveling over 75mph yelds an entire vehicle shake. Not a steering wheel shake. either. Sometimes it happens between 40-45. As i post this, the truck is at a chevrolet dealer that has a very good tech who works on all the corvettes in the area. Anyhow, hes currently stumped with my issue that 3 other dealers would not fix or refused to acknowledge. He was able to reproduce the problem exactly how i describe at high speeds but unsure where it is coming from. Does not think its the trans just yet, but not ruling it out either.

I saw that somebody mentioned something about rear spring chatter and doing something to the rear springs that would help. I know these trucks have issues with stuff in the rear clunking around which for the most part seems to be fixed by putting grease in between the brake pads and calipers. I notice with my truck that going over bumps or sometimes hard stops i get noise coming from the rear of the truck like something is in my bed but nothing is. Would this be the springs? i have checked the u bolts with a torque wrench to make sure they are in spec and they are, so they are not loose. Well, actually that was over a year ago. Has anybody had them come loose after making adjustments?

This issue seems to be very strange. Most places jump right to tire balance, and sometimes brake rotors. I can assure after 3 sets of tires were balanced multiple times and i replaced the rotors that its none of those things. Tire balances, no matter how much the road force machine says they are off, do not correct this problem. The brake rotor replacement also did nothing as the vibration during braking is not always there as well. The problem gets better in cold weather. Its much worse when its hotter out, its also worse when its dry.
 

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I was bouncing around thru a few threads on here, mostly older. and saw somebody had the same issue i seem to be having, well many seem to be having, with the Diesel and 6spd transmission. Traveling over 75mph yelds an entire vehicle shake. Not a steering wheel shake. either. Sometimes it happens between 40-45. As i post this, the truck is at a chevrolet dealer that has a very good tech who works on all the corvettes in the area. Anyhow, hes currently stumped with my issue that 3 other dealers would not fix or refused to acknowledge. He was able to reproduce the problem exactly how i describe at high speeds but unsure where it is coming from. Does not think its the trans just yet, but not ruling it out either.

I saw that somebody mentioned something about rear spring chatter and doing something to the rear springs that would help. I know these trucks have issues with stuff in the rear clunking around which for the most part seems to be fixed by putting grease in between the brake pads and calipers. I notice with my truck that going over bumps or sometimes hard stops i get noise coming from the rear of the truck like something is in my bed but nothing is. Would this be the springs? i have checked the u bolts with a torque wrench to make sure they are in spec and they are, so they are not loose. Well, actually that was over a year ago. Has anybody had them come loose after making adjustments?

This issue seems to be very strange. Most places jump right to tire balance, and sometimes brake rotors. I can assure after 3 sets of tires were balanced multiple times and i replaced the rotors that its none of those things. Tire balances, no matter how much the road force machine says they are off, do not correct this problem. The brake rotor replacement also did nothing as the vibration during braking is not always there as well. The problem gets better in cold weather. Its much worse when its hotter out, its also worse when its dry.
Most vibration is either U joints, tires, or drive shaft

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Most vibration is either U joints, tires, or drive shaft

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Brakes which you checked is the other area and last but not least, the engine can cause vibration, usually from clogged air filter or bag spark plugs. Di d you go off road and screw up an axle some how?

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Check the DS, you may have lost a balance weight.
 

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while the shake is going on, are your rear wheels bouncing? One or both? Easy to tell with your mirrors
 

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Were the three different sets of tires all the same manufacture and model? For the very brief time that I had Duratracs, they behaved exactly like what you've described.
 

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I was bouncing around thru a few threads on here, mostly older. and saw somebody had the same issue i seem to be having, well many seem to be having, with the Diesel and 6spd transmission. Traveling over 75mph yelds an entire vehicle shake. Not a steering wheel shake. either. Sometimes it happens between 40-45. As i post this, the truck is at a chevrolet dealer that has a very good tech who works on all the corvettes in the area. Anyhow, hes currently stumped with my issue that 3 other dealers would not fix or refused to acknowledge. He was able to reproduce the problem exactly how i describe at high speeds but unsure where it is coming from. Does not think its the trans just yet, but not ruling it out either.

I saw that somebody mentioned something about rear spring chatter and doing something to the rear springs that would help. I know these trucks have issues with stuff in the rear clunking around which for the most part seems to be fixed by putting grease in between the brake pads and calipers. I notice with my truck that going over bumps or sometimes hard stops i get noise coming from the rear of the truck like something is in my bed but nothing is. Would this be the springs? i have checked the u bolts with a torque wrench to make sure they are in spec and they are, so they are not loose. Well, actually that was over a year ago. Has anybody had them come loose after making adjustments?

This issue seems to be very strange. Most places jump right to tire balance, and sometimes brake rotors. I can assure after 3 sets of tires were balanced multiple times and i replaced the rotors that its none of those things. Tire balances, no matter how much the road force machine says they are off, do not correct this problem. The brake rotor replacement also did nothing as the vibration during braking is not always there as well. The problem gets better in cold weather. Its much worse when its hotter out, its also worse when its dry.
Somebody with guts is going to have to run it on a lift. (very carefully) My guess would be driveline or bad tire. Has anyone looked for a tire separation? Does a tire rotation (front to rear) change it at all? If it's a tire I bet it would shake the wheel if in the front, but not in the back. Also look at motor and trans mounts.
I don't think it could be springs.
 

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Discussion Starter #8
All 3 sets of tires were different makes and models. Tire rotation does not change anything at all. When i first got the truck i didnt drive it much over 70 but it had a vibration then. Once i started doing more road trips and running over 75 it started doing it more. The driveshaft was checked and balanced in august at a driveshaft shop and theres nothing wrong with that either. Without sitting in awkward positions i cannot see my tires bouncing in my mirrors, it does not seem like they are. Towing stuff does not seem to make a difference.

The truck is a diesel, its a pavement princess. I use it as my primary vehicle for commuting road tripping and occasionally hauling stuff. When it happens it does not shake the wheel, its the entire vehicle. I will add this is a 2018 with 76,000 miles. When its winter time, it does it less, you need to go to higher speeds to find it. As it gets hotter out it does it more often and the speed at which it starts can be as low as 70-75.
 

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All 3 sets of tires were different makes and models. Tire rotation does not change anything at all. When i first got the truck i didnt drive it much over 70 but it had a vibration then. Once i started doing more road trips and running over 75 it started doing it more. The driveshaft was checked and balanced in august at a driveshaft shop and theres nothing wrong with that either. Without sitting in awkward positions i cannot see my tires bouncing in my mirrors, it does not seem like they are. Towing stuff does not seem to make a difference.

The truck is a diesel, its a pavement princess. I use it as my primary vehicle for commuting road tripping and occasionally hauling stuff. When it happens it does not shake the wheel, its the entire vehicle. I will add this is a 2018 with 76,000 miles. When its winter time, it does it less, you need to go to higher speeds to find it. As it gets hotter out it does it more often and the speed at which it starts can be as low as 70-75.
Does it make a harsh noise too? Anything like that? That could be a mount. Has anyone run it on a lift and looked for anything out of round? Excessive runout? Does lightly hitting the brakes while it's doing it make any change? Does engine speed matter, or just truck speed? Seems most likely that if it was the trans or TC it would do it at different speeds accourding to engine speed, not just truck speed.
At least it's getting narrowed down. The temp thing is very odd. Let us know how it goes.
 

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Not sure the 6speed has a manual mode, but can you force it to 5th or 4th gear while it is vibrating and see if the intensity of the vibration changes with engine rpm?
 

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Discussion Starter #11
There are no harsh noises other than everything in the cab that isnt bolted down clanging around. The passenger seat will actually wiggle, you can see that. Sometimes it makes the hood flutter which you can see in my dash cam. Hitting the brakes makes a change, it sometimes makes it feel like i have warped rotors. I do not have warped rotors because warped rotors would pulse all the time. its very much related to truck speed, temp, and driving habits. I have tried putting it in manual mode and it makes no difference. If i set Cruise control to 80mph, drop to L and 5th or 4th it doesnt really change much. It also makes no change if you put the trans in neutral.

Strange though, It can be more intense when the truck is powering up hill vs coasting downhill. I still have not heard from the tech yet so I wonder if he took it home for the weekend. He was supposed to call me friday morning with more info. I will see if anything comes up tomorrow
 

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Might be worth checking transmission mount at rear cross member.

 

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Discussion Starter #13
Might be worth checking transmission mount at rear cross member.
Check it how? I have visually inspected it and nothing about it looks wrong. Its got all the bolts in it and its tight? I see a few have suggested putting the truck on a lift and running it but i dont think id safely be able to get it to a fast enough speed to see anything on a lift. Maybe a dyno!
 

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Check it how? I have visually inspected it and nothing about it looks wrong. Its got all the bolts in it and its tight? I see a few have suggested putting the truck on a lift and running it but i dont think id safely be able to get it to a fast enough speed to see anything on a lift. Maybe a dyno!
look for sagging, metal touching metal, rubber torn.
run it on a lift and look for anything out of round at least.
Sounds pretty bad, you must have a bent axle or something like that.
 

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Check it how? I have visually inspected it and nothing about it looks wrong. Its got all the bolts in it and its tight? I see a few have suggested putting the truck on a lift and running it but i dont think id safely be able to get it to a fast enough speed to see anything on a lift. Maybe a dyno!
Seems another forum member found loose bolts there. If yours are tight, likely not it.

A dyno at this point is a very good idea actually. That would let you simulate actual driving loads.
 

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Discussion Starter #16
Looks perfect. Nothing torn rubbing etc. The trans mount on this truck actually looks very similar to the one i just replaced on my 98 jeep TJ. THAT was worn out, so ive got a decent idea of what an old one vs new one should look like too.

As far as running it on a lift, unless i can get this service tech to agree to doing it I really dont know who i could ask to do that. My one buddy with a shop we would not trust the lift that much to run a car on it over just in gear idle speeds. Since the tech is a corvette specialist i wonder if he knows somebody or has access to a dyno. I will def ask this when i speak to him next.
 

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I would use a dial indicator to check for any axle/axle flange runout with the wheels mounted and without wheels mounted to truck. That would verify that axles and hubs are running true and verify wheels are true.
 

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Looks perfect. Nothing torn rubbing etc. The trans mount on this truck actually looks very similar to the one i just replaced on my 98 jeep TJ. THAT was worn out, so ive got a decent idea of what an old one vs new one should look like too.

As far as running it on a lift, unless i can get this service tech to agree to doing it I really dont know who i could ask to do that. My one buddy with a shop we would not trust the lift that much to run a car on it over just in gear idle speeds. Since the tech is a corvette specialist i wonder if he knows somebody or has access to a dyno. I will def ask this when i speak to him next.
Like Jason said, he could just let it idle in gear and watch for anything out of round or any wobble.
 

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Looks perfect. Nothing torn rubbing etc. The trans mount on this truck actually looks very similar to the one i just replaced on my 98 jeep TJ. THAT was worn out, so ive got a decent idea of what an old one vs new one should look like too.

As far as running it on a lift, unless i can get this service tech to agree to doing it I really dont know who i could ask to do that. My one buddy with a shop we would not trust the lift that much to run a car on it over just in gear idle speeds. Since the tech is a corvette specialist i wonder if he knows somebody or has access to a dyno. I will def ask this when i speak to him next.
please give us an update on this, I'm really curious what it is.
 

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Discussion Starter #20
I have no updates at this time. I have not gotten a call back. I will call them tomorrow and see what is up with it. I am loosing my shirt driving this jeep to work instead of the diesel truck!
 
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