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Old 03-05-2013, 02:46 PM   #1
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4L60E Transmission Issues

Alright here's what I've got. I've got a '98 Z28 that's got 112k miles on her,a mild cam, and a few other bolt on's that are irrelevant. I just picked her up for practically nothing. I've got it running great now, and took it for a quick cruise to see what it would do. It makes the transitions from N-R and N-1 just fine, makes 1-2 fine, and at about 25 mph in second it feels like it goes into neutral. However, from a dead stop it made it to 80 mph in third with no problems. When in 2nd, after it feels like it goes to neutral I let off completely and I can feel it lock back into second. According to my Snap-On Solus scan tool, the TPS is working alright, and there are no codes from engine or trans. Does anybody have any insight on this? Your help is greatly appreciated.
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Old 03-06-2013, 02:35 PM   #2
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Re: 4L60E Transmission Issues

Quote:
Originally Posted by Z28silverstreak View Post
Alright here's what I've got. I've got a '98 Z28 that's got 112k miles on her,a mild cam, and a few other bolt on's that are irrelevant. I just picked her up for practically nothing. I've got it running great now, and took it for a quick cruise to see what it would do. It makes the transitions from N-R and N-1 just fine, makes 1-2 fine, and at about 25 mph in second it feels like it goes into neutral. However, from a dead stop it made it to 80 mph in third with no problems. When in 2nd, after it feels like it goes to neutral I let off completely and I can feel it lock back into second. According to my Snap-On Solus scan tool, the TPS is working alright, and there are no codes from engine or trans. Does anybody have any insight on this? Your help is greatly appreciated.
From a dead stop you were at wide open throttle up to 80? Did you check the fluid?

-Geoff
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Old 03-06-2013, 02:47 PM   #3
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Re: 4L60E Transmission Issues

Yes, fluid is right where it should be when hot, is not burnt and is brand new. When I left for the first drive it always seemed like it went into neutral at a certain sweet spot, and if I let off and feel it go into gear, I get all over it and it burns the tires, but under light throttle it does the same thing. Does the TCM need to see throttle percentage separate of the ECM?
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Old 03-06-2013, 02:54 PM   #4
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Re: 4L60E Transmission Issues

Also the fluid that I drained was not burnt, and did not have any metallic powder in it.
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Old 03-07-2013, 02:13 PM   #5
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Re: 4L60E Transmission Issues

Thanks for the help guys, I ended up removing the valve body and applying air to the clutch apply passageways, and the 1-2 clutch pack leaks a little and the 3-4 clutch pack leaks A LOT...time to yank it out and put a 6 speed in it!
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Old 03-07-2013, 02:13 PM
 
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