Are all 700r4 torque convertors lockup units or not? I have an 89 drive train in my 86 whcih I just got. I don't think the lockup is working( if it has one) I had a 90 z-71 with the same drivetrain and when it locked up, you knew it had. If it doesn't lockup how bad is it for the tranny? or is it bad?