Shifting

snowman44 · August 13, 2017

I have always been a chevy person and also have a zo6. My current 2016 midnite edition with a 5.3 is always searching for a gear. I have had it to the dealership and they said that is the way it is. It really irritates me that I have to spend $500 on a dyno tune to get a almost $48k truck to shift properly. Any other suggestions? Truck has a cat back and AFE momemtum gt cai.

ChevyRoofer · August 13, 2017

Sorry man but I'm in the exact same boat as you. Even the tune doesn't iron out everything 100%

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snowman44 · August 14, 2017

Did the tune help at all? Do you think it was worth the $$$$?

SouthernSilveradoGuy85 · August 14, 2017

When I had my '14 the trans acted weird, but after about 2-3K miles it started to work and shift perfect. It was in learn mode to learn your driving style for the most part.

snowman44 · August 14, 2017

Truck has 14k miles

JacobC1983 · August 14, 2017

Mine has about 14k miles on it. Sometimes I get in it and it will shift perfectly for the whole morning, then I get in it that afternoon to drive home and it shifts like a hunk of crap. Lurches forward on the downshift, some of the upshifts are harsh, especially the 1-2 and 2-3 shift. It almost has a Jekyll/Hyde personality.

Mine is a 2016 5.3L/6 speed.

Crstfr · August 14, 2017

Mine has about 14k miles on it. Sometimes I get in it and it will shift perfectly for the whole morning, then I get in it that afternoon to drive home and it shifts like a hunk of crap. Lurches forward on the downshift, some of the upshifts are harsh, especially the 1-2 and 2-3 shift. It almost has a Jekyll/Hyde personality.

Mine is a 2016 5.3L/6 speed.

my 16 as well... i have the 5.2 8sp

gone_fishing · August 14, 2017

Diablo inTune i2 helped the shifting on my Sierra quite a bit. Holds gears longer and not so eager to be in 6th. Also maxed out throttle boost to help with throttle response.

JacobC1983 · August 14, 2017

I did the diablo tune as well, and had Lew complete the tune. While it did help in some regards, it made other things worse. The engine tune was very good, but I still got some very clunky upshifting and didn't care for the firmer shift pressures in city driving.

gone_fishing · August 15, 2017

I did the diablo tune as well, and had Lew complete the tune. While it did help in some regards, it made other things worse. The engine tune was very good, but I still got some very clunky upshifting and didn't care for the firmer shift pressures in city driving.

Do you know if upshift torque management is turned off? The first time I tuned I turned this setting off. Shifts seemed sloppy. Turned it back on and it got better.

This is what Mike on the DiabloSport forum told me:

"We often recommend leaving the upshift abuse mode TM enabled as it can lead to sloppy shift feel when disabled, as you may have discovered. TM on the engine side is already disabled in the tunes."

JacobC1983 · August 15, 2017

Great question, and yes it was on.

Do you know if upshift torque management is turned off? The first time I tuned I turned this setting off. Shifts seemed sloppy. Turned it back on and it got better.

This is what Mike on the DiabloSport forum told me:

"We often recommend leaving the upshift abuse mode TM enabled as it can lead to sloppy shift feel when disabled, as you may have discovered. TM on the engine side is already disabled in the tunes."

Rkaroll953 · August 17, 2017

sprint booster helps some. im in the same boat as u

ChevyRoofer · August 18, 2017

Did the tune help at all? Do you think it was worth the $$$$?

Did it help? Yes.

But was it worth it? Honestly if you're not adding headers, blower/turbos, or 35"+ tires, I'd say don't worry about it.

Donstar · August 18, 2017

I believe the learn mode is period of time when the driver and transmission grow to understand each others' feelings and emotions. Both driver and truck can be more irritable after a bad day at the office! ;-) My last three trucks have been remarkable at figuring out what gear to shift to and when to shift. Sometimes I've had to change my behavior to get the transmission to do what I am asking. I would far,far rather do the shifting myself as I can't expect a transmission to read my mind.

gtbigup01 · August 21, 2017

Well I see for 17 nothing has changed lol. Mine, one month old, 4200 miles, and if I start off slow after coming out my driveway, there's a loud clunk upshift. Even my wife who knows nothing about cars asked "what is that"? I was too embarrassed to tell her that my brand new, 1st GM product, that's how it is. I opted to ignore the question lol.