4l60e issues - need help!
07-05-2009, 09:19 PM
#1
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4l60e issues - need help! I'm at a loss as to what broke or whats happing and before I take it to a place like Aamco to get raped I'd like to see if maybe someone else has had the same issues if they could tell me whats the issue and if I canfix it myself.
1. Basically the first thing I'm noticing is that when it's cold (first drive of the morning after sitting all night) it shifts just fine from 1 - 2 but the 2 - 3 shift is WAY delayed. Some times she'll get to 4K before even wanting to make the shift. After a couple of miles or just warming up for 15 minutes it'll be fine. But after it sits for a few hours it starts doing it again.
2. The other issue I'm finding is that if I punch it too hard from a dead stop (breaking the tires loose) she seems to miss the 1-2 shift altogether and red-lines. If I get off the gas and let the RPMs come back down it'll shift but any hard hit and it's like it forgets it has a second gear and goes right into neutral...
I've looked at a couple of FAQ about this POS transmission and from the bit I've found I've decided to replace the shift solinoid A and B and I've checked the 1-2 shift actuator piston for damage (and I checked the 3-4 for the hell of it). They are in fine order. Fuilds have been flushed and changed. Filter is new. I don't know what else it could be.
Any help would be appreciated.
1. Basically the first thing I'm noticing is that when it's cold (first drive of the morning after sitting all night) it shifts just fine from 1 - 2 but the 2 - 3 shift is WAY delayed. Some times she'll get to 4K before even wanting to make the shift. After a couple of miles or just warming up for 15 minutes it'll be fine. But after it sits for a few hours it starts doing it again.
2. The other issue I'm finding is that if I punch it too hard from a dead stop (breaking the tires loose) she seems to miss the 1-2 shift altogether and red-lines. If I get off the gas and let the RPMs come back down it'll shift but any hard hit and it's like it forgets it has a second gear and goes right into neutral...
I've looked at a couple of FAQ about this POS transmission and from the bit I've found I've decided to replace the shift solinoid A and B and I've checked the 1-2 shift actuator piston for damage (and I checked the 3-4 for the hell of it). They are in fine order. Fuilds have been flushed and changed. Filter is new. I don't know what else it could be.
Any help would be appreciated.
07-05-2009, 09:28 PM
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I've got somewhat the same problem. I just posted above yours with the 2000 denali 4l60e. I read somewhere that the Throttle positioning sensor could have something to do with it, but it doesn't really make sense to me.
07-05-2009, 09:31 PM
#3
I would have to guess that you have solenoids or valves that are sticking when its cold. However when the trans is hot and does not want to make the 1-2 shift I would suspect a band is starting to fail. Either way it seems that you are going to need an overhaul in the near future. I would suggest looking at what we have to offer when the time comes. Vince