Harsh Downshifts - is there a fix?

[chrispassas21]

im going to try for the lemon law as hard as I can. im sick of having to leave work early to take this shitbox to the dealer who cant fix it. im going to try to legally fcuk them as much as possible

What ever happened with this?


2015 Silverado LT Midnight Edition
4.5” CST suspension lift
Sent from my iPhone using Tapatalk

[njk4o5]

The lemon law is a PITA to do. I probably had to bring my truck back and forth to the dealer 15 times but finally got a new trans out of them. Truck is out of warranty now and at 113k miles. I put 35" tires on it too and so far the shifting is back to normal.

[Brandon Romero]

I have a 2015 Chevy Silverado LT with 96,000 miles on it . I’ve been noticing the harsh downshifting as well , I bought a diablo tune and set it to performance 93 while also turning off my AFM . Hoping this will fix all the harsh shifting I’ve been experiencing with the truck . It helped a little but not really . Still get weird shifting from the first 3 gears up and down . I did this only because the dealership told me the truck was supposed to shift like that .. I’m in fear of my trucks tranny taking a dump on me shorty after I lift my truck . Past trucks drove 10x smoother 

[Jwc]

So does anyone think hard down shift is what could have caused my torque converter to come apart?

[MGIG]

On 4/25/2017 at 4:01 PM, Dunc said:

On 4/25/2017 at 2:24 PM, njk4o5 said:

theres no way this is normal. my truck does it intermittently 75% of the time. the other 25% of the time it drives as it should

This is a normal symptom of the GMC tranny. You can push and hold tow haul for three seconds and it will shut the gear brake off and it helps tremendously! Also try using Diablos Preditor 2 Tune, seems to help.  Good luck 

 

[bubbanbrenda]

turning off hill decend helps a lot for my 2014, but still not a cure. I think the hill descend feature should be off my default below 30-40 MPH would be a good idea.

[Vatech]

Just bought a used 2014 sierra z71 doing exactly the same a hard downshift when almost stopped smooth all other times  going to the dealer tomorrow to have it checked didn’t feel normal for sure!

[JeremyGray]

I got a new transmission at about 170k. Never had a hard down shift. Now I have 50k on the new transmission and today it started down shifting real hard. Especially from 2nd to 1st. Before you never really noticed it even down shifted. One time today it almost chirped the tires.