2016 Silverado bump from behind

[Ltz4 me?]

Any fix for bump from behind at stop/ hard shift from stop in 1st gear?

[lerbud]

Get a tune.  It will fix the wonky 1-2 shift. I used diablosport on my 2016.  

[Ltz4 me?]

I've seen talk about this "Diablo"

My truck has dual aftermarket exhaust on it( so I don't know if that makes a difference?)

[Ltz4 me?]

They are "borla" brand( I'm unsure what model)

[Ltz4 me?]

After some thought and posting this question, could it be that the previous owner installed this borla exhaust and didn't do a updated tuning to the motor/ transmission which is causing this bump from behind feeling at stops?

 

[newdude]

21 minutes ago, Ltz4 me? said:

After some thought and posting this question, could it be that the previous owner installed this borla exhaust and didn't do a updated tuning to the motor/ transmission which is causing this bump from behind feeling at stops?

 

 

No.  I assume you have the 8 speed?  If so, its normal.  

 

Quote

 

16-NA-361: Information on Transmission Harsh 1-2 Shift Upon First Start Up/Shift of the Day Under Light Throttle 

 

Some customers may comment that the transmission exhibits a harsh 1-2 shift on the first shift of the day, typically under light throttle.

 

This condition is due to the initial clutch fill time of the 2-3-4-6-8 (C4) clutch.

 

Some customers may experience a flare condition on the first 1-2 shift of the day or after the vehicle has been parked for several hours. The condition may have developed after the replacement of a complete transmission assembly or the replacement of the stator support to correct a delayed engagement condition. This is most likely to occur under light throttle conditions. Subsequent 1-2 shifts have acceptable shift feel. Replacing transmission components will not correct the condition.  

 

Important: Replacing transmission components or complete assemblies will not improve the condition.

The first 1-2 shift of the day may be harsh. The customers’ vehicle should be compared to a like vehicle under the same driving conditions. Do Not replace any parts for this condition.

Note: This condition will not impact the designed performance or reliability of the vehicle.

 

 

[Ltz4 me?]

Ok, says nothing about the bump from behind feeling when I stop?

What excuses have they created to cover this up?

[Ltz4 me?]

Another person/ thread says to use a tuner to get rid of this condition...

[JimCost2014]

Worth trying, there are a lot of posts on the site here about the subject, lots of reading about cures, and no fixes at all.

[Ltz4 me?]

I'm going to turn off AFM and tune my truck and will post my results