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I’m having an issue with my trans in my 1999 f250 7.3 ,when my trucks in a tune that puts out more power then stock my trans will slip only while the converters locked while doing 45+ under load getting on it a bit , it’ll be pulling good and then just feel like it’s in neutral and Rpms shoot up until I let off the throttle then it catches again, if i drive the truck “normal” it won’t do it, also I tried this with OD on and off and it happens in both,it does shifts perfect through all gears,Trans was rebuilt 30k miles ago it has a BD valve body, and the converter is about 3 years old and has about 45k miles on it, my question is does this seem like the converter is going bad since it’s only during Lock up ?, I want to