A10 Transmission Issues. Need Input Please.
 

I just thought I'd post on here to get different opinions. I personally believe it's 2 things, either a bad tranny or the TCM tune is way off.


But basically, after our track day, it's never shifted the same. We might of finally pushed it to it's limits, but...........I have gotten varying opinions so. It is what it is. Just fyi. We did to a tranny fluid flush and filter change. Everything looked fine for just 10k miles. Fluid was on the dark side, but nothing to throw you off.



I get a huge rev out in 1st, then it slams into 2nd. Same thing.........It revs out, then slams into 3rd. It does this all the way to 5th.


Downshifts are even worse. In paddle mode, up or down shifts are super hard. In Auto, it revs out then slams into the next gear. In Auto mode cruising Hwy speeds, if you blip the throttle, its a hard down shit, revs out, nothing. It's like it's always out of the power band or something. Cars a dead stick right now.


Any ideas?


Just for added info to diagnose. We ordered an unlocked TCM from HP Tuners. We couldn't get it to read anything so we put the stock TCM back in. For clarification, when we did the track pulls, we did have the HP TCM in the car. Which is prob why it ran like shit. But, on the flip, Sorian said he didn't see anything weird in the logs so. Who knows. So, we put the stock one back in, did a relearn, that did nothing. If anything, it's gotten worse so.


I just got a new set of Welds put on it. Here she looks, sitting still. Broken down like an old hag. haha.
https://i26.photobucket.com/albums/c...su7o5005c.jpeg
https://i26.photobucket.com/albums/c...sdfvgbtbw.jpeg

Did you have the problems prior to messing with the fluid? Low fluid does what you're complaining about.

Nope. We didn't change the fluid until we put back the stock TCM. We put in the HP TCM the night b4 the track day. We did 2 dyno hits that night. I picked the car up, took it to the track the next day. No issues at all until I got back to the house. My driver said he thought it was slipping at 5th gear. But, the rains came, we went home. Next day I drove it to the store and was like wtf. Bang bang bang............every gear change was hard as hell. Now it's just worse.



We gonna wait till we get the new TCM in. If that doesn't work, I guess it's a trans issue. We'll upgrade the packs and send it. haha.



It can only be a few issues honestly. I'm just hoping it's not my worst case scenario............a new trans. But, that won't solve anything either. No need to put another stock trans in running 1200 hp through it. We'll find out sooner or later I guess what the issue is. Just sux.

I didn't realize you were running that kind of power...lol. Yeah, your trans is lucky to be alive. :lol:

I'm also assuming there are no codes.

Are there any upgrades available for the A10? I guess it’s harder chasing problems like this since everything is electronically controlled. Hope it’s not a new trans

Nope, no codes. Nothing.

I don't think there are. I thought I saw some upgraded packs, but not sure if they truly work or not.

Even if i do need a new trans, what's the freaking point. haha. Gonna smash that one too. We need some upgraded internals. I just don't see how it's a bad trans when there are guys cracking high 8's with stock trans. At best, if my car is dialed in, I'm a 9.0 to 9.4 car. Maybe, just maybe if God is looking down on us, we crack 8.9. lol. But there are plenty of 9.5 and under cars and their trans aren't busting so. Hopefully it's just tuning issues and I have a feeling that is what it is. We shall c!!

I don't know how dark the fluid was, but 10K mile fluid should still be very red. Excessive heat can make it dark, especially if there was a decent amount of clutch slippage.

For the most part, how the transmissions shift is all controlled by the valve body and ECU/TCU. Especially if all gears are being affected in the same manner. I've rebuilt a few trannies and worn clutches, pistons, bushings, etc. don't do what you are describing. Worn bushings will cause low pressure and lots of slippage, but too much pressure (and harsh shifts) are generally a VB problem. Take the VB off and open it up. It may be clogged with debris and just may need some cleaning. If it DOES have debris though, it came from somewhere; so one way or another, you are on borrowed time.

I would say the fluid was darker than normal. More than it should be at 10k miles, but as mentioned, it didn't really bother my tuner.



Haha, whatever is going on, I'm having slippage and hard shifts all the same time. And I'm not even sure you would call it slippage. It's more of revving out then slamming into the gear. It just feels like slippage because it's not shifting at the normal shift points. Even at start up, when I put it in reverse, it clangs into reverse. There are basically no smooth shift points anymore. It's all hard shifts.


When we put the Pro Charger on, I had over rev on the 1st and 2nd gear. We tuned that down a bit, but it was still there, just not as bad. But now, holy crap it's bad. haha.


It's like this. 1st gear, roll out. Hit the paddles into 2nd. It doesn't engage right away, it revs out, the bam, slams into 2nd. It does that same shit all the way to 5th. In auto mode it's even worse. Revs way out, then bam, slams into gear.

It's gotta be valvebody or tune related.

Given that it’s happening pretty much under all conditions, valve body seems like a good bet IMO.

sounds like what happens when your typical centrifugal clutch goes out.
laaaaaate-shiiiiifffft then CA-LUNK into gear.

Did you take it to the dealer?

I would advise dropping the pan and have a look inside. It should have some sort of witness of failure. :help:

happy hot-rodding