4L60E Trans only shifts 2 and 3
I put this power train in my 68 c10 from a 99 camaro. Everything is working great except the auto shifting. The power train was not taken apart except to change the trans fluid and filter. It only runs in R, 2nd and 3rd. What could be the problem?
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Re: 4L60E Trans only shifts 2 and 3
It's in limp mode, many things can cause this. A lot of times in a swap its because the transmission doesn't have power, have you checked that? Have you scanned for any codes?
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Re: 4L60E Trans only shifts 2 and 3
Let us know the following:
What engine? What computer? What engine / trans was in the truck before the swap? What electrical harness did you use? How many direct grounds are in place between the trans and the chassis and engine and chassis? The info you provide will then guide us down the diagnosis / repair process for you... :chevy::chevy::chevy: |
Re: 4L60E Trans only shifts 2 and 3
I am having the computer person check next week. When I installed the engine and trans I tried to ground all things.
This is out of a 1999 camero 4L60E 5.7 engine. I kept all the wiring and computer. Moved the computer to under the dash. This was a basic truck with no options but in original condition. I added PS, PB, AC, Instruments, Springs, Radio, Moved gas tank Sway Bars etc. Before the change it was a 6 cyl. with 3 speed |
Re: 4L60E Trans only shifts 2 and 3
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I am having this same issue with my swap. My combo is a 5.3 4l60 from an 03 Silverado, harness and computer are from the same truck. I attached a screen shot of the codes I have.
It was all working fine then as I was driving I heard the rpms go up and it quit shifting. Fluid was 2 qts low but I have no visible leaks. I checked power at the trans and I'm only getting 10.6v. I've been told by multiple people to check the trans fuse. I don't believe I have one?? I'm in the process of tracing the pink power wire from the the trans all the way back. |
Re: 4L60E Trans only shifts 2 and 3
I hate just throwing parts at problem but maybe just a bad VSS sensor? I had brand new 4L60E rebuilt from a local I trust and he installed a brand VSS during the rebuild process and it was bad out of the box. But in different new one and the trans worked normally.
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Re: 4L60E Trans only shifts 2 and 3
Thats an awful lot of codes for something like one sensor to have gone bad all of a sudden. Being this is a swap, I am still leaning toward a wiring issue. Did you check for power at the big round plug on the transmission?
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Re: 4L60E Trans only shifts 2 and 3
not sure just a question. did you connect the tcc wire from your ecm to the brake pedal to power .
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Re: 4L60E Trans only shifts 2 and 3
I started tracing the wrong wire. Pin E is the wire I had less than a volt on. So that's a problem...
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Re: 4L60E Trans only shifts 2 and 3
the tcc wire gets power from the brake switch. The brake switch is a special two terminal switch. Four single wires. The first two are for brake lights so you have constant power to the brake switch so when you apply the brakes the power goes to the brake lights, Tcc wire are on the top of the switch. It works just the opposite. Power is suplied all the time from a constant power source to the tcc wire. When you apply the brakes it disconnects the power to the trans convertor.
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Re: 4L60E Trans only shifts 2 and 3
[quote=dayj1;8813771]Your harness should have a fuse just for the transmission (it would have originally went to the fuse block in the truck that the harness came in). But, if you don't, then you'll have to trace the wire from pin E to determine where it's going now.
I don't have a trans fuse now. So I'll have to keep tracing, but I'm assuming it goes to the pcm? My fuse block has a bunch of pink wires on one side which I assume are the injectors and one pink wire going to the ignition relay. Quote:
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Re: 4L60E Trans only shifts 2 and 3
If you have 10v on the power wire for the trans then that should be enough since it will go up when the wngine is running. Is this an original harness or aftermarket?
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I did the continuity test on pin E. It goes to the sensors fuse on the engine fuse block(10A)
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