rev limiter/delayed shift

[calgator73]

I'm not sure if something is wrong or not. I've had a 2007 denali with the 6l80 and a g8 with the same. Downshifts from 30-40 are sometimes hard but always precise. On my last tank of E85 in my 2014 (steady cruising @ 45) I floored it. Truck downshifted and engine revved correctly. When it was time to upshift it practically fell on it's face. Not sure if it's a rev limiter issue or some kind of delayed shift. Tried again today on regular and once in four attempts did I get it to act weird. Not getting any indication of traction issues (no idiot light blinking) Thoughts?

[Cliff14Denali]

I had that happen to me as well. Truck went to shift WOT into 2nd gear and just hesitated/vibrated into 2nd gear.

[calgator73]

Today part throttle acceleration from a stop. At around 35 all power was pulled back for about a second or two then it shifted to 2nd

[00Silverado4x4]

With all the torque management that must be in these trucks, it doesn't surprise me the engine feels doggish at WOT. In my truck's case I get better accel with only 3/4 throttle vs WOT. Guess we all need get a tune & enjoy.

[bboyce536]

Sorry for digging up an old thread, but the other day merging on the freeway my truck did this. My 2nd to 3rd upshift, my truck hit the rev limiter in 2nd and just lost all power for almost half a second before shifting. Not sure what was going on there...

[calgator73]

I think it might be related to that bulletin (I'll have to dig it up again) but the dealer could not duplicate and it set no codes. I also had the sloppy (sounded/felt like a slip shift) 2-3 at times but only when tranny was hot. Have to wait until summer camping season I guess to replicate consistently.

[calgator73]

I think it might be related to that bulletin (I'll have to dig it up again) but the dealer could not duplicate and it set no codes. I also had the sloppy (sounded/felt like a slip shift) 2-3 at times but only when tranny was hot. Have to wait until summer camping season I guess to replicate consistently.

http://www.gm-trucks.com/forums/index.php?/topic/-Transmissions-Issues/Problems

[02suburbanZ71]

Yea 3/4th does better than wot at a stop. Either way i cant spin the wheels tuned

[bboyce536]

http://www.gm-trucks.com/forums/index.php?/topic/-Transmissions-Issues/Problems

Link won't work. I have read up on some transmission threads with them clunking, but this seemed significantly different. I have numerous times used manual mode to shift and haven't upshifted quickly enough and had it hit the rev limiter and that is exactly what it felt like on the freeway...except I was in drive. Honestly think it is a combination of Tq. management and low line pressure.

[bboyce536]

Yea 3/4th does better than wot at a stop. Either way i cant spin the wheels tuned

Are you talking about our 14 trucks? Only reason I ask is because if I mash mine to the floor from a stop I can leave a 50-75 foot black 11 and I am not tuned.

[02suburbanZ71]

Im talking about spinning wheels in my 02. But yes i've driven many 2014 silvys and they do get best off the line with 3/4th pedal at least thats with my experience with them

[calgator73]

Link won't work. I have read up on some transmission threads with them clunking, but this seemed significantly different. I have numerous times used manual mode to shift and haven't upshifted quickly enough and had it hit the rev limiter and that is exactly what it felt like on the freeway...except I was in drive. Honestly think it is a combination of Tq. management and low line pressure.

Here you go...http://www.gm-trucks.com/forums/topic/157944-transmissions-issuesproblems/?p=1532501...