[Rivergoer]

What’s the harm in adding another 1/2 quart or so just for s#its and grins?

 

[MP81]

What’s the harm in adding another 1/2 quart or so just for s#its and grins?

An upset overfilled transmisison, haha.

 

[revjpeterson]

What’s the harm in adding another 1/2 quart or so just for s#its and grins?

An upset overfilled transmisison, haha.

What’s the harm in adding another 1/2 quart or so just for s#its and grins?

If I get to the end of my warranty in 6 weeks, and they haven't done anything, I'm planning to do a level check, then when I refill the lost fluid, overfill it by 4 ounces or so to see how it changes the behavior. If it improves but not completely, I may add another 2-4 ounces at a time until I see complete improvement or it gets worse again, and I know where the optimal level seems to be. I'm also considering using an additional friction modifier to see if I can squeeze any improvement out that way. For the next 6 weeks, though, I'm just waiting and hoping it will completely take a dump or show consistent enough symptoms to repair/replace under warranty.

 

[MP81]

It definitely seemed to be very happy, for months, when I filled it following the "proper" procedure.

So, either it leaked fluid out again, or something is physically just taking a ****. Based on the fact the couple failures seem to be similar to what we're experiencing, I'm thinking this likely has nothing to do with fluid - especially since it's so intermittent. When our fluid was low, you could basically count on it to be useless.

 

[jblackburn]

It definitely seemed to be very happy, for months, when I filled it following the "proper" procedure.

So, either it leaked fluid out again, or something is physically just taking a ****. Based on the fact the couple failures seem to be similar to what we're experiencing, I'm thinking this likely has nothing to do with fluid - especially since it's so intermittent. When our fluid was low, you could basically count on it to be useless.

The stop-neutral feature on the Aisin 55-50SN was problematic for 99% of them. Often a huge jolt or slow engagement as they got up there in mileage.

Most that owned that transmission disabled it or had to replace solenoids.

Surprisingly, it doesn't seem to be an issue for the 6T GM transmissions, but there may be something about the Aisin boxes that still don't like it.

 

[MP81]

The stop-neutral feature on the Aisin 55-50SN was problematic for 99% of them. Often a huge jolt or slow engagement as they got up there in mileage.

Most that owned that transmission disabled it or had to replace solenoids.

Surprisingly, it doesn't seem to be an issue for the 6T GM transmissions, but there may be something about the Aisin boxes that still don't like it.

You could be onto something there. If that starts to go out, you're essentially neutral-slamming the transmission because you're giving it throttle, but it hasn't put itself into gear yet. That's good for it.

 

[Chris Tobin]

The stop-neutral feature on the Aisin 55-50SN was problematic for 99% of them. Often a huge jolt or slow engagement as they got up there in mileage.

Most that owned that transmission disabled it or had to replace solenoids.

Surprisingly, it doesn't seem to be an issue for the 6T GM transmissions, but there may be something about the Aisin boxes that still don't like it.

You could be onto something there. If that starts to go out, you're essentially neutral-slamming the transmission because you're giving it throttle, but it hasn't put itself into gear yet. That's good for it.

Next time it acts up ask your wife to switch it over to manual shift mode and see if it resumes normal operation to prove that theory... As I understand it putting it into manual shift mode disables the stop-neutral feature...

 

[MP81]

Good idea - I'll tell her that.

Now, whether or not she remembers to do it, that is a different story.

 

[lsone]

Ive had the same issues. Ever since I went to amsoil, Ive been dealing with this for roughly 30,000km. Had amsoil in it for 70,000km. Cars been deleted for 75,000km or so.

I want to say its a solenoid that sticky or failing. I have a suspicion that the amsoil has swollen an o ring enough to cause this. My reason being is when the car finally smashes into gear, its aggressive. If the solenoid was failing... It wouldn't last this long. At least with my transmission experience.

The unfortunate reality is everyone wants to remove and replace the transmission. Im not totally convinced that is required... Also, sonnax has a decent read up on behavior issues. My 1-2 shift has always been very rough, however while live scanning it, the car locks and unlocks the converter a ton and seems to be doing its job(has never felt different). We just need to confirm what solenoid controls the neutral while sitting portion.

https://www.sonnax.com/tech_resources/332-adjusting-clutch-control-valves-on-aisin-fwd-6-speeds

 

[MP81]

Yeah, I'm not sure what the dealer would replace - whether it be the solenoid or the whole trans.

Putting it in manual mode makes the problem disappear entirely.

 

[Louis]

Check the transmission cooler lines for 'sweating' where the metal pipe is connected to the 'rubber'. This a compression union and known location for leaks. This is where mine was leaking, very slowly.
-Louis

 

[XtremeRevolution]

I've been running AmsOil in near everything I've owned for the last almost 20yrs. The more I hear about how picky manufacturers are with their fluids in their new cars has started to make me think twice about AmsOil lately. This thread don't help, makes me suspicious of how the fluid is treating the Aisin trans. I've got to do my first oil change on my Cruze and not even sure which brand of engine oil to go with anymore. Although, when I called the Chevy dealer, to buy the oil they use seems to be cheaper than if I were to go to the local parts store(with my discount). I'm thinking factory fluids is best anymore...I dunno.

Ive had the same issues. Ever since I went to amsoil, Ive been dealing with this for roughly 30,000km. Had amsoil in it for 70,000km. Cars been deleted for 75,000km or so.

I want to say its a solenoid that sticky or failing. I have a suspicion that the amsoil has swollen an o ring enough to cause this. My reason being is when the car finally smashes into gear, its aggressive. If the solenoid was failing... It wouldn't last this long. At least with my transmission experience.

The unfortunate reality is everyone wants to remove and replace the transmission. Im not totally convinced that is required... Also, sonnax has a decent read up on behavior issues. My 1-2 shift has always been very rough, however while live scanning it, the car locks and unlocks the converter a ton and seems to be doing its job(has never felt different). We just need to confirm what solenoid controls the neutral while sitting portion.

https://www.sonnax.com/tech_resources/332-adjusting-clutch-control-valves-on-aisin-fwd-6-speeds

Regarding both of the above posts, this has nothing to do with the fluid. The fluid meets the requirements of AW-1. Automatic transmissions aren't picky about what ATF they use unless the manufacturer specifically designs them for a different viscosity (Honda is doing this lately). The clutch material is more or less the same across transmissions, it's just a matter of the line pressure used to engage those shifts. Don't believe the lie that you need to use an OEM transmission fluid in order for a transmission to function without problems; that's absolutely false. These specifications overwhelmingly deal with oxidation stability and and shear stability; the fluid's ability to withstand stress and abuse over time, not with specific friction characteristics.

Furthermore, AMSOIL doesn't swell seals. It just doesn't happen. We don't use rubber anymore like transmissions used to long ago. All of the seals we have now are synthetic polymers like nitrile/Buna-N. A swelling seal would not cause any of the aforementioned issues, especially given the kind of line pressure we are dealing with.

Aggressive shift engagement suggests the transmission may be either over or under filled. I don't think this is a solenoid issue. Are all of you bringing the transmission up to the required temperature range before checking fluid? I haven't checked the diesel, but on the 1.4T automatics, the range is 185-203F, which is actually not that easy to achieve without throttle braking for several minutes on end to heat up the fluid in the torque converter. Overfilling results in aeration of the fluid.

Is this symptom constant or intermittent? Does the issue occur only when hot, or regardless of transmission temperature?

I want to assure you, my stating that the fluid has nothing to do with this, is in no way an attempt to protect my own reputation or AMSOIL's brand reputation. I firmly believe that the fluid has nothing to do with this issue, and that were another fluid used for the same duration, the same symptoms would be experienced. It doesn't matter whose AW-1 spec fluid is being used, these fluids are all designed to be compatible with all transmission seals and clutch packs. The biggest difference between them is durability.

 

[MP81]

@Snipesy, is there something in the computer logs that can be seen that points to this happening?

My wife said she had a particularly heavy "slam" yesterday, but given how inconsistently it happens, I'm not sure we'll ever be able to get the dealer to see it, as it will probably decide to act fine while it is there.

Shifting it into manual - and thus, disengaging the neutral-stop feature - seems to entirely solve the issue.

 

[Snipesy]

@Snipesy , is there something in the computer logs that can be seen that points to this happening?

My wife said she had a particularly heavy "slam" yesterday, but given how inconsistently it happens, I'm not sure we'll ever be able to get the dealer to see it, as it will probably decide to act fine while it is there.

Shifting it into manual - and thus, disengaging the neutral-stop feature - seems to entirely solve the issue.

I'm sure it detects it but that's all proprietary Aisin stuff. Not even GM tools can detect it and frankly I don't even know where to begin with it.

 

[Aussie]

Surprisingly, it doesn't seem to be an issue for the 6T GM transmissions, but there may be something about the Aisin boxes that still don't like it.

I have the 6T45 transmission in my 2012 diesel and it seems fine so far. I did notice that if I put the shift in manual mode the transmission doesn't go into neutral when the car is stopped, maybe it is worth trying to see if it makes a difference?

 

[MP81]

I'm sure it detects it but that's all proprietary Aisin stuff. Not even GM tools can detect it and frankly I don't even know where to begin with it.

So, basically, our best shot would be to take it to the dealer and kidnap a tech to ride with us as we demonstrate the issue, when the transmission is currently misbehaving.

It likes to do it more in stop and go traffic, but it doesn't seem to always correlate with temp. It will do it for a while, then stop doing it while in the same traffic. So just sounds like a solenoid (or whatever controls it - TCM?) going out. The sometimes it doesn't do it at all.

I have the 6T45 transmission in my 2012 diesel and it seems fine so far. I did notice that if I put the shift in manual mode the transmission doesn't go into neutral when the car is stopped, maybe it is worth trying to see if it makes a difference?

It solves the issue entirely, not going into neutral when stopped.

 

[Grazitp]

I have not been on the site I a while but had the same problem with my transmission Car would SLAM into gear from a stop. Took to dealer multiple times Without any satisfaction. Always got the same response, "we cant find anything wrong". Trans lines replaced and fluid changed with GM fluid made no difference. Finally in June, 2 months before warranty expired dealer drove car and experienced Slamming into gear. Replaced transmission and has ben working fine since. Only issue I have now is a loss in mileage, (4-6mpg) since trans was replaced.

 

[BDCCruze]

Few things on this.

First, I have seen a surprisingly little amount of transmission fluid make the difference before. Family member had a Chrysler and it would have intermittent issues where it wouldn't move. Still had transmission fluid on the dipstick, though at the bottom. Adding less than 1 quart fixed it.

Secondly, Amsoil does make compatible Transmission fluid, but are you sure you used the right version? They have non-compatible versions as well. Do you still have the receipt or empties to take a picture of? If you take it in for service I would not admit guilt that you touched the transmission fluid because it probably voided your warranty.

 

[cooter2]

I am having the same slamming into gear issue from neutral issue. I noticed that it only happens when the transmission is warmed up, does not happen for me just after starting the car. My car is very high mileage 166k. I don't know if the fluid was changed prior to me getting it, but that is my next to-do on the tranny. I can confirm putting it in manual "fixes" it. I also replaced the Brake Position Sensor. Thought that fixed it, it got better for a few days, but today I noticed it was back.

I would be willing to try others ideas of they have any success.

I found this, may help us figure this issue out: https://workshop-manuals.com/vauxha...ransmission_range_selector_lever_replacement/

 

[andrewjwill]

I am having the EXACT same issue. Slamming intermittently always from a stop. Never when shifting. Does downshift into 4th pretty hard when slowing down on a hill. I have not been able to figure out the problem and there are no codes. Dealer said they cant detect a problem and no trans codes. It wont do it for the techs but 3 people now have experience it. 60,000 miles on mine and started sometime between 45-50,000 miles. I had some sensors recently replaced that they said could have been the issue but didnt solve it at all.