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4l60e acting weird

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Old 05-05-2011, 08:00 PM
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Default 4l60e acting weird

about a month ago i changed the fluid and filter in the tranny on my 94 k1500, and added a b&m shift plus(or as i call it now **** plus). while im cruising between 45 and 60 mph, it for lack of a better way to describe it, slips. it shifts fine but while im driving the rpms change by just a very little amount fast and slow. it didn't do it before i changed the fluid. i do have 33s on it and 3.42 gears, but they've been on it for years. any thoughts?
Old 05-05-2011, 08:28 PM
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i have that same kit and it was ok at first then i added a vett servo and it would bang the 1-2 shift at light throttle and 2-3 shift but if a was hard on the trottle it would do fine . so i just turned it to the off side. and stopped running it when around town i use stage one when towing and shifts nice when towing just not good when daily driving at light throttle .
Old 05-05-2011, 11:06 PM
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its not so much the shifting im concerned with. its the constant change in rpms when im at part throttle from 45-60 mph.
Old 05-05-2011, 11:13 PM
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3/4 might be going out. that rpm change is really noticalble when you have non sock exhaust. IF you just drive it in 3 does it do the same? Do you have a trans temp guage? It could be several other things as well.

If you had never changed your fluid until now all the "stuff/gunk" is now gone and theres is more free space between your steels and clutches. I would predict you have a tranny rebuild in your future. My last truck i had the 60e rebuilt a total of about 6 times. I am not a stranger to slipping trans.

Have you checked your fluid level?

The rpm changes is the clutches slipping. I bet that if you put it in cruise control it still will have the rpm changes. Eventually our steels will over heat, warp and your down.

Last edited by pasadenaman; 05-05-2011 at 11:18 PM.
Old 05-05-2011, 11:18 PM
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could be many things even a torque converter clutch sliping of locking and unlocking
Old 05-05-2011, 11:24 PM
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TCC solonoid as well, the valve body might be closed or even a stuck check ball in your trans like in my old 60e trans.
If you need to replace the solonoids buy oem only.



Old 05-05-2011, 11:51 PM
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ill try to get video of it tomorrow. im planning swaping a newer one when i do the 6.0 swap anyways. i just need to get this one to last til then. fluid level is good, a little foamy. i think it was always like that though.
Old 05-05-2011, 11:56 PM
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put in a bottle of the lucas stuff for slipping trans. its thick and might help keep it up and running for a while.
Old 05-06-2011, 12:09 AM
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foamy ? could be over filld
Old 05-06-2011, 07:51 AM
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So it doesn't do it in just 3rd. And every now and then when I park and get out I can smell tranny fluid. It doesn't leak, but I can noticeably smell it.


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