Mine also never goes from 1-2 unless I am shifting manually with S engaged. If you can legitimately rev the car in-between that shift you are correct something is definitely wrong. BUT, if its being slow in the morning when ice cold and you try to speed it up by mashing the pedal i wouldn't be surprised if it throws it in neutral and then takes 3-4 seconds to shift.
Oh boy. If it is still under warranty then don't worry about it, but it sounds to me like the fluid level wasn't correct. That is stereotypical low fluid behavior. As the fluid heats up it expands slightly and satisfies the minimum fluid level requirement. I'd put money on it the the dealership didn't check the fluid level because its a PITA to get to. Then they just replace the valve body because there is already a TSM for it. Sounds like the dealership is just looking for more money...
I have this issues for over a year and I have read every thread about 10r80. I have spoken with various gearbox experts and repair services. The CDF drum is the main reason for many issues because it cannot hold pressure. I have ordered every part that needs to be changed and I will keep you all updated
Are you sure? Because I have driven a 2018 10r80 (rental) and my 2021 10R80 and it always makes those sounds if you are staying still and switching between 1st and 2nd. I don't really like using the paddles...so its not really an issue for me.
You are correct the 10At will make noises in between 1-2 at a standstill, but this is not the normal noise. I suppose there is never a noise that is 100% normal with these though, lol! I did this on mine and I could definitely hear the solenoids moving, but it was way quieter and was quick.
Is your transmission tuned by Wengered or is it still the stock transmission tune?Hey all. I have two 10R80 related questions. Hope you can help.
1. Since boosted, I noticed under very light acceleration that the gear changes (in Normal) are very smooth but, after the change I get a wobble on the rev counter, like it bounces up 100rpm then back down and settles at the speed it should. Rinse and repeat for another gear change. You can hear the exhaust note change (increase then decrease again). Accelerate a bit harder, or full WOT and it doesn't do it. Is it just a quirk of being so gentle and now being boosted? More of quirk than an annoyance.
2. My main question. Gearbox in sport. Gear changes are not harsh in engagement but, the car seems extra keen to downshift 2-3 gears even with just a dab of the brakes. Is this normal? I had it happen to me doing about 75mph, dabbed the brakes to slow for cars in front and the car dropped about 3 cogs and revs shout up. It didn't do this with my old tune / pre boost. Should I get back in touch with Wengered about this one? It means I don't really use Sport as it becomes too unpredictable.
The Owners Manual I believe states "The automatic transmission downshifts to a higher RPM when braking aggressively. " But I'm not braking aggressively and it seems to do it.
Good question. He has made one or two tweaks that I know of because I wasn't happy with some of the shift points in earlier maps. He has very kindly sent me a revision over this evening which I've applied so I'm going to test it and see how it goes.
If it is tuned then honestly its a problem with the tune not the transmission. Especially the fact it like to downshift with littlest of braking. That's definitive tuning. I'd definitely see how the new tune goes!
