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Stock tranny with stock converter? Yes it is normal, the factory settings won't let the converter lock until it reaches operating temperature. Not sure what temp that is though.
That's right... consider that to be proper and normal operation. Torque Converter clutch lock-up is inhibited until the transmission is up to operating temp.
Yup its normal.. I DD my car and using HPT I verified.. my 01 starts to go into Lockup when the trans reaches around 75*F and the engine reaches around 140*F.