I would try to adjust the shift cable or linkage.
Testimonial: "that didnt help it was not in linkage"
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: I have a 2004 chevy venture, and transmission
get it into the shop (transmission shop - not the dealer) ASAP! We just had one of the clutches go in ours - it burnt through the tranny fluid in less then a month. This with 125k (kilometres) on the odometer...
SOURCE: 96 chevy blazer 3rd gear and overdrive slipping
i got a 1996 chev. blazer s-s10 4.3 engine 4x4.problem i got is i got 1st 2nd & overdrive & reverse but no 3rd gear what should i do
SOURCE: my 97 chevy blazer won't shift past 3rd gear
Drop the pan, odds are the shift solenoid is out, its located at the front of the trans on the driver side. I'm sure your check engine light is on that will comment about the timing/shift solenoid being bad. I had the same problem with mine. The solenoid had plastic coming out of the inside. To remove it you'll find a small C clip holding it in, just take a small screw driver and pull the clip out. The part cost me like $36 from my local dealership. And its a longer solenoid. I believe its the 3-2 downshift solenoid. I do have the part number if you need it.
Testimonial: "Thank you so much. I actually thought this was the problem, but i didn't know. Thanks again!! send me the part number"
SOURCE: 97 venture 4 speed electronic transmission not shifting into 4th
4th clutch hub splines are stripped off. GM didn't harden the splines until 2004 or so so the early model gradually wear to the point where they are so thin they strip off - and then, no 4th gear
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