I installed a Yank SS 4000 a few weeks ago and yesterday check engine light came on. The trans started to shift harder after that but had all gears. Then I shut the car off and started again and trans shifted fine. Checked and had a P0757 code, cleared the code and has been shifting fine and no light since then. Could it be small debris from the new converter that stuck the 2-3 shift solenoid or ????. I changed the fluid and filter when I changed converters. I had a Vig 2800 in this for over 2 years with no problems.

 

With a 4000 stall you will see that code intermittently , The high stall is confusing the PCM you will need to have the test for that code deleted this will solve the issue its a comon issue with any stall over 3000 rpm

 

Thanks, appreciate the info.

 

Your welcome any time