Transmission fix finally for 14-15 sierra silverado! WOOOOT!

topshelfproducts · February 25, 2015

So had my truck at the dealer to replace the heated seat for the second time (first time only did passenger seat) and my service advisor who is also a friend of mine who owns a 14 sierra said I would love my truck when I pick it up.

Turns out gm came out with a transmission programming update for my 14 GMC Sierra. My truck has the 5.3l and 3.42 gears.

I cannot believe how much better my truck feels! The transmission shift points are soooo much more improved than before, shifts are quicker, but not necessarily more firm, although maybe slightly. But again the truck feels amazing, like a totally different vehicle. So much more responsive, give it a little gas and it snaps right into the gear I would choose if I had a manual, and feels so much more intuitive overall. After driving around all afternoon and this evening I have completely fallen back in love with my truck. I will admit that this to me was the biggest downfall with the truck after owning it for 6500 miles, but I love love love the responsiveness in my truck now!

I have done tunes on previous vehicles over the years with programmers etc, and even open source tuning but can say I have never experienced a difference in a vehicle like I did with this.

So to make a long story short, call your dealer and see if they have the update available, you will not regret it!!!

Hopefully this helps out a lot of people, and I am very interested to hear what other people think. Please comment on if you have this done what you think of the difference!

Edit, this is a beta version that is not global on gm yet. I will update when my advisor states this is ready globally.

Trza · February 25, 2015

Looks like I'm going to harass a GM dealer for my lunch break tomorrow! Thanks for the heads up!!

Dunc · February 25, 2015

So much more responsive, give it a little gas and it snaps right into the gear

This part intrigues me A LOT! Would have I have to call the dealer to see if this would apply to me or not? I have a '15 with the 8-speed trans.

Newell33 · February 25, 2015

Are you able to get a bulletin number, or any documents that we can reference?

Thanks!

Green 1364 · February 25, 2015

My truck goes in this morning will ask and see if I can get it done and update info for everyone.

fondupot · February 25, 2015

Good to know. Even though I have a blackbear tune, I will revert to stock and check this out. I have to go in for a oil change soon anyhow.

2Speed · February 25, 2015

Can you call your buddy and get the TSB number?

This is great news!

bdbake01 · February 25, 2015

Yep, need TSB. Extra cred to dealer if TSB # is "BlackBear"

Stevens03 · February 25, 2015

Yep, need the TSB number and I'll go in for this update. I feel my trucks transmission is all over the place. I don't entirely dislike it, but it sure could use some improvement.

GMC-AT · February 25, 2015

Someone please get a reference number TSB, etc. and post it... My truck is going in tomorrow for oil change, would love to get this done as well.

f8l vnm · February 25, 2015

Great news but yearning for more info please. Is it for all models? 6.2.

Funny thing is I'm about to pick mine up for seat issues. Would love to somehow talk to my service guy about this.

GMC-AT · February 25, 2015

likely only the 5.3

Someone post a reference TSB ..... as I'm 99% my dealer won't know a thing about it.

topshelfproducts · February 25, 2015

I must apologize everyone. I called him this morning and he advised this is not global gm yet, but a "beta test" basically that they are doing on a few trucks to determine customer feedback. Basically a trial type program that gm is testing to get rid of complaints of clunking, shifting hard, and lugging. He said he would let me know asap when it is confirmed and released, but I guess I just going lucky knowing the service writer.

If anyone knows any service writers personally you may be able to work this through, but I will update thread as soon as I have any updates.