2011 Auto trans issues

[ylow281]

Hi, first post here guys. I have a 2011 GT Edelbrock supercharged with an auto. I'm having some issues with the trans and haven't got a solid lead yet. Intermittently on part throttle either manually shifting or leaving it in D the trans will pop into neutral on the 2/3 shift. Car will rev to like 5500 and takes its time before it comes down and goes back into gear. Also, the 2/3 shift is abnormally harsh on part throttle either manually shifting or when I leave it in D. Enough so that it'll chirp the serpentine belt. I read the info on the solenoids from TSB 11-11-11 and it sounded like that might cure it. I replaced the 3 solenoids myself....that didn't fix the problem. Best lead I have right now is that it could be the molded lead frame in the trans itself going bad. I have an e mail to Lund to check the trans tune just to see if anything is out of spec with the tune. Any ideas would help...thanks

 

[CPRsm]

Sounds like the clutches or application of them (seals) are bypassing. The seals hold the pressure to clamp the clutches and steals. Tranny isn't old enough I'd imagine to see it, but the seals can get old and harden and do this also. But usually you only see it when the tranny is cold and the problem gets better or goes away when it warms up. But just sounds like your average sign of a mechanical problem, clutches or seals. This would be my thoughts as long as the tranny has preformed flawlessly until all the sudden. If it was a tune issue it could have caused the clutch problem, but would have been a problem since the first tune and you'd already know that. So I really doubt that's the cause.

 

[ylow281]

I started noticing the harsh 2/3 shift towards the end of last year. The rpm's in certain gears at certain times started hanging a little longer also. As far as going into neutral shifting from 2 to 3 that just started a month or so ago. Did it again last night bout 3/4 throttle manually shifting from 2 to 3...right into neutral. Car hung at about 5500 for 5 seconds or so and then finally went back into gear.

 

[kdanner]

Sounds like direct can't hold. Should do the same thing going into 5th if that is the case, but you'd not be likely to ever be going into 5th with much throttle. I would have expected to see some nasty fluid/debris when you changed the 3 VFS out. No DTCs?

 

[ylow281]

Yeah going into 5th every now and then is a tad abrupt but like you said it's not with much speed so it's hard to notice. No error codes and when I dropped the pan I didn't notice anything too bad. I'm not a trans expert but there was just a thin coating at the bottom of the pan no debris. Someone on another forum said they just bought a 2014 brand new, totally stock, and its doing the neutral 2/3 thing. I'm hoping he gets it to the dealer soon to hear what they say.

 

[CPRsm]

Thin film at the bottom is normal. It is possible to burn the clutches and lose holding capacity and the clutches don't end up in the pan. That's usually what I see in clutch packs

 

[ylow281]

Something new to throw out there. Was leaving my brothers last night and I took off manually shifting. 2/3 shift the car goes into neutral like it does and then finally goes into 3rd. This time I got a wrench light. So I'm thinking I can finally look up the code and see whats up. Drove to the next stoplight in D. Leaving the light I put the car in 1st and manually shifted again. This time on the two three shift the car got stuck in 2nd or 3rd gear. No matter where I moved the shifter the car would not shift. So I had to drive the last few miles home at 35 on the highway to keep the rpm's under 4000. Pulled in the driveway and instinctively shut the car off. Grabbed the tuner and started the car and the wrench was gone. Took it for a ride and the car was shifting fine again!!! I was so pissed! This is why I'm thinking it has to be something electrical or in the valve body rather than the clutches. I'm at a loss though......

 

[Sky Render]

There was a TSB for shift flares on the 2-3 shift and delayed reverse engagement. It involves replacing solenoids. Have you had this done?

EDIT:

Here ya go:

http://www.s197forum.com/forum/showthread.php?p=1170236#post1170236

 

[FIVE-OH]

There was a TSB for shift flares on the 2-3 shift and delayed reverse engagement. It involves replacing solenoids. Have you had this done?

EDIT:

Here ya go:

http://www.s197forum.com/forum/showthread.php?p=1170236#post1170236

He mentioned TSB 11-11-11 in his first post.

 

[Sky Render]

He mentioned TSB 11-11-11 in his first post. But he said 3 solenoids, TSB says 4.

So here's the thing. There are like 5 or 6 different part numbers. The solenoids have to be replaced like for like, and you don't know what solenoids you have until you drop the pan. I assume this has to do with manufacturing tolerances of the transmission. There's also a relearn procedure and/or reflash involved. That's why I asked if he had the actual TSB performed.

 

[ylow281]

Yes I've replaced the solenoids and reset the trans keep alive memory.

 

[zemog255]

I had a somewhat similar issue. Mine wasn't specific on what gear I was in but would do the same thing. Turned out to be a wiring harness on the trans had moved and was touching my header grounding it out. This was over a year after I had put my converter in. The car would only mess up when warm and eventually got to the point the car wouldn't even start. Finally found the harness on the header moved it and haven't had an issue since. I would try looking around for any loose wires or anything that looks out of place.

 

[phil h]

Any updates on this? I am having similar issues and wanted to see what he might have found.