Check trans fluid level/color. trans may have old/bad fluid in it and may need to be flushed and new filter installed.
SOURCE: 4L60E won't shift to 3rd on 1995 Chevy Astro 2wd
do the pin point tests, these start witjh running a trouble code test, autozone and kragen will do this for free, if u haven't had the trans apart then cross out any crossed wiring issues, but I do think you will find a problem with the 2-3 shift solenoid, either the solenoid has failed or the connector has a problem on the outside of the trans.
SOURCE: 4l60e slips in 3rd and 4th
There are to many things that can cause this problem, best thing to is go get the ECM scanned for DTC codes at a transmission shop or Auto zone or Parts Source since they scan for free.
The ECM should have DTC code in it's memory on how the transmission is Performing and have the Transmission line tested for Fluid pressure.
Good luck and hope this helps. Oh and also ways check with more then on transmission shop if there tell you that you need a new Transmission,
It could be a simple as the transmission filter falling off causing the lost of transmission fluid pressure. Check the transmission fluid too.
SOURCE: 4L60E Shifts fine in 1st, 2nd, & 3rd but will not shift into OD
The EMC detected and problem so it's in limp mode, As long as it's in limp mode the 4th and OD will not activate. Take care not to burn up the transmission by running it hard while your in the limp mode.
Your going to have to get the truck scanned to clear any codes and why there are DTC codes. Auto Zone scan for free and most auto shops charge $10.00 to $20.00 to scan sine they want the business.
If you want to clear the codes your self you can put the ignition to the run position and pull the ECM (Batt) fuse out for 20 sec and place it back in then start the truck. It may stall but let it, just start it again and this would have cleared all the DTC code history.
The transmission should be running fine unless there is a problem and the service engine light will be on again and you'll be in limp mode still with an updated DTC in the ECM.
Good luck and hope this helps.
SOURCE: 4L60E won't shift to 3rd on 1993 Chevy Blazer
Hello;
It sounds as though your trans is going out. How is reverse? If reverse is real strong then you may just have a solenoid going out. Drop the pan and change the oil and filter if you are comfortable doing that. Inspect the pan for metal shavings and contaminents. Otherwise it would need to go to a shop for repair.
Thanks;
Rich
RPM Northwest
SOURCE: 4L60E won't shift to 3rd on 1993 Chevy Blazer 1500
Sounds like you have a bad shift solenoid. Not sure if the Chevys are a solenoid pack, or seperate, but it will need to be replaced.
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