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This is due to the fact that the transmission fluid cannot be rerouted to the part of the transmission that would be making the. Failure to Downshift The 4L60E will often fail to downshift if one or more of the shift solenoids are stuck open or closed.

It was working 100% before the shift kit install, which only had us replace parts in the valve body, but it was never able to shift out of first since. Here are the main symptoms of a bad 4L60E shift solenoid. 5v to 3.4vīased on what I can find out by other forums and such, this collection of symptoms seems to be a very uncommon one.

TPS shows correctly in my transmission controller software, reading from about.

Nothing I've torn down so far has any wear, and there's been no odd noises coming from anywhere while driving.

Sonnax Corvette servo installed with just enough shims to allow the input shaft to still be hand-rotatable.

Using the gear selector/tree also doesn't get out of 1st/R.

Commanding gears with the trans controller doesn't change anything.

You can kind of feel the transmission try to shift to 2nd barely when it's supposed to, and then stops "trying".

If my transmission control/PCM is unplugged completely it limps still inġst gear (which to my understanding is supposed to be impossible, since both solenoids being off should be 3rd).Both shift solenoids have a resistance of 25 Ohms and click nicely with a 9v battery.I've been through quite a bit of troubleshooting and am basically at a loss I have a 1999 4L60E from a 1999 Suburban that has been rebuilt twice successfully, and then had a TransGo 4L60E-HD2 shift kit installed that ultimately led to where it's at now with it's reverse and 1st only issue.