[revjpeterson]

I'm in exactly the same scenario right now, but closer to my warranty cutoff. I'm at 95,000 and my warranty expires on Sept. 27. Same AMSOil fluid, replaced the lines about a year ago, behavior is intermittent, rollback, slams into gear from neutral taking off from a stop, etc. I also get some wicked 5-4 and 4-3 downshifts when slowing down or getting off/on throttle on hilly terrain, but that is intermittent too.

I need to get it dealt with in the next 6 weeks, but the behavior hasn't been consistent enough for me to risk the $105 diagnostic fee if I take it in and they can't duplicate. I'm hoping it really goes south in the next 6 weeks, or that GM will offer some kind of remedy when I contact them directly that doesn't involve me risking paying an hour's labor for nothing.

 

[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.

 

[revjpeterson]

I think I need to get this car raised up a bit, and check the trans temp with the biscan app this time, and ignore the 0.4L extra fluid that I had seen, wherever it was, as it appears we do not need the extra addition once it reaches the super-scientific drip rate of ~one drip per second. All these issues literally could just be from fluid foaming from too much.

I just hate pulling that aeroshield off so, so much. Almost all the clip centers that you pull out have broken so you can't use a panel puller tool under to pull them out, so I guess pliers it is...

I'm considering just leaving the aeroshield off once I do my delete next week. I've found when it's off, I can drain and fill the transmission and pull the level check plug without lifting the car, just by laying on my back in front of the left-front tire and reaching my arm underneath. You can't get a good view, but as long as you know where it is already, and know the size wrenches you need, it's within reach.