2015i 3500hd, you guessed it - vibration issues

[captainbrent]

Hello, I found this forum in my search to remedy my problems with my new truck. I thank all in advance for sharing their knowledge.

 

Front and center is the vibration issues that appeared the first time I brought truck up to 60+ mph(168 mi on the odometer). Many trips back to selling dealer yielded no help. On my dime, I replaced Goodyear SRA's with a set of Nitto Duragrappler hiway treads. I took truck to a old school heavy truck alignment shop, where they immediately found one of my base model steel rims to be bent from factory. After confronting dealer, they replaced the rim. Alignment shop then performed a good ole strobe balance on truck. This took care of the bouncing and hopping related items all the way to high speeds. This took place at around 6000 mi. After this I noticed what felt like a u-joint going bad or out of spec. At around 64 mph it feels like going over very worn rumble strips. This continues on up through 80 mph. I feel this was somewhat masked earlier due to poor tire balance.

 

I drive a 2000mi round trip to Fla every 4-5 weeks(took delivery on 10/5/15, currently have 17,000 on odometer) and after each trip have returned to the dealer to no resolve. The same responses; can't duplicate or within spec. Realizing like with the tires, if I am to get any relief, I will have to diagnose myself. Therefore suspecting driveshaft, I had driveline specialist check rear driveshaft, which came up within specs. Now I am back at the drawing board, thinking maybe rear differential. I am open to suggestions. Also I have the passenger door wind whistle, that dealer also can't locate. Thanks

 

 

2015i GMC 3500hd cc4x4 Duramax

[calgator73]

Hello, I found this forum in my search to remedy my problems with my new truck. I thank all in advance for sharing their knowledge.

 

Front and center is the vibration issues that appeared the first time I brought truck up to 60+ mph(168 mi on the odometer). Many trips back to selling dealer yielded no help. On my dime, I replaced Goodyear SRA's with a set of Nitto Duragrappler hiway treads. I took truck to a old school heavy truck alignment shop, where they immediately found one of my base model steel rims to be bent from factory. After confronting dealer, they replaced the rim. Alignment shop then performed a good ole strobe balance on truck. This took care of the bouncing and hopping related items all the way to high speeds. This took place at around 6000 mi. After this I noticed what felt like a u-joint going bad or out of spec. At around 64 mph it feels like going over very worn rumble strips. This continues on up through 80 mph. I feel this was somewhat masked earlier due to poor tire balance.

 

I drive a 2000mi round trip to Fla every 4-5 weeks(took delivery on 10/5/15, currently have 17,000 on odometer) and after each trip have returned to the dealer to no resolve. The same responses; can't duplicate or within spec. Realizing like with the tires, if I am to get any relief, I will have to diagnose myself. Therefore suspecting driveshaft, I had driveline specialist check rear driveshaft, which came up within specs. Now I am back at the drawing board, thinking maybe rear differential. I am open to suggestions. Also I have the passenger door wind whistle, that dealer also can't locate. Thanks

 

 

2015i GMC 3500hd cc4x4 Duramax

Note the RPMs at the speed you're having issues and use manual mode on the tranny to get the vehicle to same RPM but at different speed. If it is related to the engine (motor mounts) or tranny (think torque converter) it should manifest itself.

[xxxjimbo1731]

I just purchased a 2015 3500 ltz and yep it has a vibration at 70 to 80 so they found a bent rim and replaced all 6 tires eventually and no it didn't go away. So they call a tech from corporate down to take a ride with all his computer stuff and he said it was the inside left tire on the rear so it was replaced. OK the rear vibration went away but the shaking in the steering wheel was still there. So he said they would put a stabilizer shock on it so they did and now it shakes worse and and at different speed now . And now it shakes the back seat so now they are calling the tech again and I am about out of patients with them

[RyanbabZ71]

Tire pressure?

 

 

Ryan