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Did he use a new or used valve body?
Usually a harsh downshift from 2nd to 1st is due to the torque converter clutch coming out of lockup late.
This may be due to incorrect fluid level, torque converter clutch solenoid fault, faulty torque converter, or faulty valve body.
Because this was not present before valve body replacement, I suspect that either the new valve body is defective, incorrect installation, or the fluid level is incorrect.
Only the torque converter clutch solenoid would set a fault code.
No, there is no break in period for the valve body. It either works correctly when installed or doesnt.
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