4L60E 3rd gear problem?

4L60E 3rd gear problem?

Postby jeff's93astro [OP] » April 7th 2010, 7:35am

my 4l60E has had the fluid and filter changed when i first bought the van had just a little grey sludge on magnet no shavings and shifted great but now weather its warm or cold the trans takes R almost instantly but D takes about 2-3 seconds to grab. but it shifts fine except for about 70% of the time when it shifts into 3rd it feels like it goes from second to neutral then to 3rd in about a second its quick about it but i can feel it and also hear the slight rev through the exhaust. also TC lockup doesnt feel as firm as either 700R4's i've had. i'm not sure if its the original tranny are not but the van has 229,000miles and the motor is out of a 89 astro. Easy fix or time for new tranny
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Re: 4L60E 3rd gear problem?

Postby astro355 » April 7th 2010, 8:28am

Does this describe the symptom accurately?

30. 1-2 or 2-3 shift is slow/soft above part throttle: Trans is on its way out. R&R.

https://www.astrosafari.com/viewtopic.php?f=70&t=5956
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Re: 4L60E 3rd gear problem?

Postby jeff's93astro [OP] » April 8th 2010, 12:34am

i got to driveing it again today and this time at certain throttle positions it would shift normal sometimes light throttle sometimes heavy but not everytime i'm expecting it to be a rebuild but is it possible it could be tps or as bad as i hate to is there a snake oil/treatment that could help it last a little longer or just drive it till it goes out
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Re: 4L60E 3rd gear problem?

Postby mot_art » April 8th 2010, 12:43am

if it was the TPS.. I think It wont take long before it engages when you put it to D, neither go into neutral before upshifting.... I think your tranny is slipping... try the Lucas thing see if it fixes it.. if not I think it is going to be a Remove and Rebuild previously mentionned.
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Re: 4L60E 3rd gear problem?

Postby jeff's93astro [OP] » April 9th 2010, 5:34am

just for curosity i changed out the computer with the one that came out of my other 93 i had and it didn't do the slip thing in 3rd. and i agree with astro355 about the computers rarely going bad. and if my original is bad something had to cause it :confused:
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Re: 4L60E 3rd gear problem?

Postby astro355 » April 9th 2010, 8:01am

jeff's93astro wrote:just for curosity i changed out the computer with the one that came out of my other 93 i had and it didn't do the slip thing in 3rd. and i agree with astro355 about the computers rarely going bad. and if my original is bad something had to cause it :confused:


What are the serial numbers of the two computers?
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Re: 4L60E 3rd gear problem?

Postby jeff's93astro [OP] » April 9th 2010, 8:48am

my original computer is 16168625 BBMY and the one in my van now is a reman. i'll look for a number on it tomorrow.
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