I have an 01 GU TB45 Auto. Every morning and when I leave work after I start the engine, the tranny doesn't engage to when I place the selector on D. I have to wait 5 to 10 seconds before the tranny kicks in. If I need to leave quickly, I place the selector on 2 and it engages immediately, then place the selector in D after 10 seconds of driving. But after while, the everything normalizes. I shut down the engine after I gas up, the tranny engages immediately after I place the selector into D. Changed the ATF (Dextron III) already. The old oil seemed okay. Some guys tell me to use a thicker ATF but I didn't such a thing existed. Hope you guys can help me out.