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Transmission maintenance
I have a loaded 2004 GTS with the 3400/4t45. I'm at 160,000+ and the transmission fluid was never changed. I know... I tried at about 140K, but the dealer mechanic recommended just leaving it because it was possible that I would start having trouble once fresh detergent fluid started loosening up all the gunk.
Well, a few thousand miles ago it started shuddering if I pull out at hard throttle. Also, it shifts 1-2 a little late at hard throttle. Otherwise, it's OK: 2-3-4 are OK, and reverse is OK. So I don't know if I should do anything. The shuddering, which is my greatest concern, could be the torque converter.
The car is otherwise in excellent running condition, with only minor cosmetic issues, and I'm not ready to junk it.
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