Hard 1-2 shift (cross posted)

By Nant96
May 16, 2017 in Ask A GM Technician

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Nant96

Posted May 16, 2017

Hey guys, new to the forum. I have the 4l60e transmission and it shifts hard from 1st to 2nd, it's worse when it's cold, and I hear a clunk on the 2nd to 3rd shift but is smooth. So far I have

Cleaned throttle body and MAF sensor

Done 3 fluid and filter changes

Replaced the 1-2 accumulator

And the A and B solenoid

The transmission doesn't slip or have trouble going into gear and I've heard it could be the TPS but I don't have any codes. I could really use some advice. Im out of ideas. If you think it could be the throttle position sensor or the accelerator position sensor how could I test that. Any suggestions are really appreciated

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