i just had a th400 rebuilt and the reason is it developed a whining noise and after awhile it started laggin in the shifts like a five sec. lag, it was bad but the trans still has this whining noise to it after rebuild. my question is can the torque converter be bad and if it was would it cause a whining noise in it. i have to believe they rebuilt it cause the shifts are awesome better than it has ever been in the time of having this truck