Picked up '20 Denali 2500HD-Review

[foot 1]

1 hour ago, Shawn T said:

Wow ok maybe I’ll pay closer attention but I swear it’s as smooth as silk. I see either a recall or TSB coming. My Allison has learned and shifts are now clean and transparent 

you will know it if your truck has the problem , it is very apparent ,i'm not just being a critic ,because other than this problem it's a great product 

[get2]

I also replace original mud tires for Michelin tires with same result.  Michelin's are much better.  What i think is the rims are bad, because it is taking +/- avg of 8 ounces to balance.  This seems excessive

[jd64]

just out of curiosity, what is every bodies build date that has the shimmy ?  my build date was  7/17/19

[bharris515]

25 minutes ago, jd64 said:

just out of curiosity, what is every bodies build date that has the shimmy ?  my build date was  7/17/19

Mine is 6/19

[ShotgunZ71]

Mine was week of 7-24-19.

Edited August 24, 2019 by ShotgunZ71

[Shawn T]

Update: 300 miles and smooth ride but Allison downshift from 2nd to 1st is violent every 2 or 3 stops, not sure why any thoughts? 

[sdelam]

On 8/23/2019 at 5:21 PM, jd64 said:

just out of curiosity, what is every bodies build date that has the shimmy ?  my build date was  7/17/19

Door says 6/19

 

[sdelam]

14 hours ago, Shawn T said:

Update: 300 miles and smooth ride but Allison downshift from 2nd to 1st is violent every 2 or 3 stops, not sure why any thoughts? 

I installed a banks iDash which lets me see which gear I am in. Interesting enough, whitout a load attached I start in 2nd gear everytime. Only time I start in first is if I select L. I havnt towed since installing the iDash so I cant say for sure that will drive it to 1st or not. I can tell you that during the first few hundred miles I would get an occasional surge from 1st-2nd/2nd-3rd? (guessing on gears because it was pre iDash). I havn't felt that in a few weeks though, was told the trans has a learning period to figure itself out, could exlain why it starts in 2nd now and I havnt felt that surge recently. 

[BB&Chiveon]

wish they had gear indicator . i have my idash but waiting for block8head mount 

[sdelam]

11 minutes ago, BB&Chiveon said:

wish they had gear indicator . i have my idash but waiting for block8head mount 

i just used a suction mount for now

 

[jd64]

has anybody with the steering wheel shimmy had a chance to bring the truck into the dealer yet?  

[foot 1]

i spoke with a GM field engineer ,they want to do road force balancing to get a base line for the shimmy , i sent them a video of the shimmy and they are aware there is a problem that exists ,just waiting for my dealer to finish the repairs on my 19 ZR1 and will drop it off and pick up the vette

[BB&Chiveon]

my dealer said give it 1000 miles then take and get tires rebalanced at dealer

[bharris515]

I’m at 2850 miles and I swear it seems like the shimmy has gone away in the last 300 miles or so. Weird 

[jd64]

thanks guys for the input, i haven't had time to do anything yet and thought i would give it some miles to see how it progresses since it seems very subtle and i cant seem to feel it through out the truck.     iam at 675 miles.    i still wonder if it has something to do with the DSA steering? 

 

 

 

mike  , do you know if the field engineer has heard of this problem before you spoke with him?