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jamesjones
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Aug 18, 2015, 4:09 AM
Post #1 of 22
(2084 views)
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4l60E shift problem
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Having problems with my transmission shifting out of overdrive after driving it about 5 to 7 miles. Tried stopping and restarting and manually shifting and that doesn't help . If the truck sits for a while it will shift normal until that 5 to 7 mile mark. Checked fluids and looks good doesn't smell burnt . Any help on this would be great. Thanks.
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gsferraro
Veteran
Aug 18, 2015, 5:32 AM
Post #2 of 22
(2076 views)
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Re: 4l60E shift problem
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Hello,
Sorry alittle confused, what actually happens, does the car stop moving after driving 5 miles? Gary
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jamesjones
User
Aug 18, 2015, 6:54 AM
Post #3 of 22
(2070 views)
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Re: 4l60E shift problem
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Im sorry. The truck just loses overdrive. All other gears seem to be fine. I can hear a little grinding noise at low speed when this happens. It is a 1996 4x4 z71.
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gsferraro
Veteran
Aug 18, 2015, 7:44 AM
Post #4 of 22
(2065 views)
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Re: 4l60E shift problem
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Ok, so its shifts ok 1-2-3. When it goes to shift into 4th does it make the shift and neutralize, or just stays in 3rd. Are there any codes present? Have you had it scanned? Gary
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jamesjones
User
Aug 18, 2015, 8:07 AM
Post #5 of 22
(2061 views)
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Re: 4l60E shift problem
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It makes the shift and after several miles it looses overdrive The service engine light is not on. I will scan it and see if there are any codes for transmission
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jamesjones
User
Aug 18, 2015, 8:22 AM
Post #6 of 22
(2055 views)
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Re: 4l60E shift problem
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Scanned the truck and no codes found on engine nor the tranny
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gsferraro
Veteran
Aug 18, 2015, 9:32 AM
Post #7 of 22
(2048 views)
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Re: 4l60E shift problem
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Hello,
Are you able to view live data with your scanner? So as your driving it drops out of 4th, but always shifts 1-2-3 ok? Sorry for all the questions, but there are a few different ways to go on this one. One thing i also may have you do is unplug your transfercase control module and drive the car to see if your problem goes away. Gary
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jamesjones
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Aug 18, 2015, 9:39 AM
Post #8 of 22
(2044 views)
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Re: 4l60E shift problem
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I believe the scanner will. yes it drops out of4th and1,2,and 3 are ok . Ok I will unplug that and see what that does.
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gsferraro
Veteran
Aug 18, 2015, 10:17 AM
Post #9 of 22
(2042 views)
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Re: 4l60E shift problem
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Hello,
What i would like to see is, if the computer commands the drop to 3rd. What type of scanner do you have? Gary
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jamesjones
User
Aug 18, 2015, 10:19 AM
Post #10 of 22
(2041 views)
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Re: 4l60E shift problem
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It is a Actron auto scan plus
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gsferraro
Veteran
Aug 18, 2015, 10:41 AM
Post #11 of 22
(2040 views)
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Re: 4l60E shift problem
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Im not sure of that brand, but if you can see live data, hook it up and drive the car, when it drops out see if it commanded it to do that. the dissconnect tccm see if still have problem. Gary
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jamesjones
User
Aug 18, 2015, 10:44 AM
Post #12 of 22
(2037 views)
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Re: 4l60E shift problem
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What is the tccm and where is it located
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gsferraro
Veteran
Aug 18, 2015, 11:57 AM
Post #13 of 22
(2034 views)
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Re: 4l60E shift problem
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Tccm is Transfercase control module, it is located center of dash, but if there is a 4x4 fuse, pull the fuse out instead of tearing the center apart. I would drive the car with the scanner on it first and watch the live data, without a code present alittle hard to get direction. For instance, you could have a solenoid problem inside the trans, The manual lever position sensor(p-r-n-d-l) could be bad, even a bad engine temp sensor can knock it out of 4th, but the big question is, is the computer commanding the trans to do this.
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jamesjones
User
Aug 18, 2015, 1:18 PM
Post #14 of 22
(2026 views)
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Re: 4l60E shift problem
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Just drove the truck 8 miles from work to home and had no problems. Can't seem to understand this thing. I did do a live data really not sure what I was looking for. I can hear a noise from under the truck sounds like something not completely in gear. This truck has 4 wheel drive selector on the floor and looks to be in 2 high.
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jamesjones
User
Aug 18, 2015, 1:24 PM
Post #15 of 22
(2024 views)
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Re: 4l60E shift problem
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I found a fuse marked 4wd. It is fuse #24 on the fuse panel inside truck. I pulled it out and going to see if noise goes away
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jamesjones
User
Aug 18, 2015, 1:35 PM
Post #16 of 22
(2021 views)
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Re: 4l60E shift problem
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Noise is still there. Going to put on jack stand and try to identify where its coming from.
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gsferraro
Veteran
Aug 18, 2015, 5:56 PM
Post #17 of 22
(2010 views)
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Re: 4l60E shift problem
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See if you have on your scanner when you view live data, look for current gear or gear commanded. See if you have that, Is engine temp normal?
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jamesjones
User
Aug 18, 2015, 6:06 PM
Post #18 of 22
(2006 views)
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Re: 4l60E shift problem
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Did not see that on the scanner but I did see that the temp was 196 .. After I put it on Jack stands I noticed that the rear is making a lot of noise so now I believe I have to change all bearings in the rear end before I can go any further. I also remember that the connector for the 4 wheel drive was unplugged when I got the truck. Not sure why ?? I plugged it back in about a week ago. Hope that has nothing to do with it.
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jamesjones
User
Sep 3, 2015, 3:12 PM
Post #19 of 22
(1957 views)
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Re: 4l60E shift problem
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Sorry it took so long to get back with you.I just got the rer end back together. I pulled the 4x4 fuse and its doing the same thing. I am looking into getting another tranmission , that is if i cant get this figured out . one question I have is , can i put a trans out off a 2wd in this truck if i pull all the 4wd tranfercases out and put a drive shaft with a carrier bearing in it.. The engine temp is normal . Thanks for any advise
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kev2
Veteran
Sep 4, 2015, 9:54 AM
Post #20 of 22
(1912 views)
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Re: 4l60E shift problem
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you did SCAN? - always ask is scanner able to read all codes P0999 and up? low end readers do not.
I have often seen confusion over gears - is it 4th gear problem OR is it a TCC issue?
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jamesjones
User
Sep 4, 2015, 10:36 AM
Post #21 of 22
(1905 views)
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Re: 4l60E shift problem
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I did scan and no codes present.All I have is a small store bought one . Its loosing overdrive which I am assuming is 4th gear. I dont know what the TTC is . I can try to change that . Is it in the transmission or on side of it.
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kev2
Veteran
Sep 4, 2015, 2:30 PM
Post #22 of 22
(1898 views)
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Re: 4l60E shift problem
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need to know if you are getting ALL codes esp the p0999 and up, so called manufacturers specific...
I am thinking we should first look at a TCC issue, quick and no trans work.
will your cruise control work ? does it behave the same dropping out? You have any brake light issues? You do NOT drive with 2 feet - left foot braking right throttle?
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