You're assuming someone will buy an A8 in the ZR1 I see..... I know I know.... they say the automatics are faster.... Hmmmmm.....
Sorry for bringing up this old thread again - but same issues in my EU Version from Germany. Currently no solution from the dealer available. Are there any news on this topic here in the forum.
In Feb 2017 while in Florida I took the car to Stingray Chevrolet in Plant city where it was diagnosed as needing a TC replacement, which was the third TC. I also snagged the "bump" while accelerating in M3. The shop foreman hooked up his computer to the car and we did a test drive.At the point where we felt the M3 bump the computer showed "TCC apply" at that same moment. He consulted with GM TAC and they confirmed the bump was in fact TCC apply and normal.Hey guys, sorry I haven't posted anything in reference to the weird shift lately. Have had it to a US dealer for the MRC upgrade and showed him the 2-3 shift situation and he thought it was irregular but not a big issue. I haven't finished complaining but I need a dealer to hook up a tool and go for a drive so he can manually apply TCC (or watch when TCC applies) to make sure this is what it is. I think I am going to find that this is a software issue and it may be hard to convince someone to change a trans controller to see if that changes the situation. BTW trans has been reflashed twice and it hasn't changed. Next chance to do this is mid July as we are going to Winnipeg with the Meet in the Middle group.
Just wondering, when you were at spring mountain and you were testing for the "bump" accelerating in M3 were you in a base A8 car ( non Z51, non GS, non Z06) ???Hey guys, sorry I haven't posted anything in reference to the weird shift lately. Have had it to a US dealer for the MRC upgrade and showed him the 2-3 shift situation and he thought it was irregular but not a big issue. I haven't finished complaining but I need a dealer to hook up a tool and go for a drive so he can manually apply TCC (or watch when TCC applies) to make sure this is what it is. I think I am going to find that this is a software issue and it may be hard to convince someone to change a trans controller to see if that changes the situation. BTW trans has been reflashed twice and it hasn't changed. Next chance to do this is mid July as we are going to Winnipeg with the Meet in the Middle group.
Sorry to hear you have that issue.......first one I have read about other than base carHere is one:
Z06, Build November 2016, Euro-Version - has the bump. And there are some more complaints about it at my dealership. GM answer is still not available.
Not sure if anyone has ever got a resolution to the issue yet but I have a 2015 Z51 and starting getting the hard jerk when moving from park to drive. I always noticed a bit of a delay since I got the car but never paid too much attention to it but now that it's jerking fairly hard and I started noticing some issues in the first few gears where they just don't seem that smooth in both upshifting and downshifting. However in manual mode it seemed better, anyway I brought it to the dealer due to the recommendation from a performance shop who did some research and noticed that this issue is all over the US forums and there are several technical bulletins related to the A8 transmission which includes a 2016 software update, to replace the stator shaft support and finally replace torque converter. The dealer was actually well informed and noted that they have seen a lot of issues with the A8 transmission in several of the vehicles not just corvettes but at some point in 2016 it looks there were several part number changes such as the torque converter along with the stator shaft support. The dealership mentioned that in their experience so far the least effective resolution was the software update and in basically all cases the issue was mechanical. Thank the corvette gods the dealership is corvette friendly and has now ordered me an entire new transmission with all the updated parts and is just doing a complete replacement under the warranty program. Cost of the A8 8L90 transmission on its own is $4600 so I feel like I dodged a bullet. Should be in late next week and a few days to install so once I get the car back and drive it a bit I'll let everyone know if the issues are resolved with a complete transmission replacement.
You should be fine with the new transmission. It will include the latest iteration of the Torque Converter and the new transmission fluid. My 2018 , built late June 2017 incorporates the aforementioned and the drive line is night and day different than what I had in my 2015, August build 2014, which was a nightmare. The 2018 shifts are fantastic and butter smooth.Not sure if anyone has ever got a resolution to the issue yet but I have a 2015 Z51 and starting getting the hard jerk when moving from park to drive. I always noticed a bit of a delay since I got the car but never paid too much attention to it but now that it's jerking fairly hard and I started noticing some issues in the first few gears where they just don't seem that smooth in both upshifting and downshifting. However in manual mode it seemed better, anyway I brought it to the dealer due to the recommendation from a performance shop who did some research and noticed that this issue is all over the US forums and there are several technical bulletins related to the A8 transmission which includes a 2016 software update, to replace the stator shaft support and finally replace torque converter. The dealer was actually well informed and noted that they have seen a lot of issues with the A8 transmission in several of the vehicles not just corvettes but at some point in 2016 it looks there were several part number changes such as the torque converter along with the stator shaft support. The dealership mentioned that in their experience so far the least effective resolution was the software update and in basically all cases the issue was mechanical. Thank the corvette gods the dealership is corvette friendly and has now ordered me an entire new transmission with all the updated parts and is just doing a complete replacement under the warranty program. Cost of the A8 8L90 transmission on its own is $4600 so I feel like I dodged a bullet. Should be in late next week and a few days to install so once I get the car back and drive it a bit I'll let everyone know if the issues are resolved with a complete transmission replacement.