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Old 10-18-2007, 06:14 PM
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4L60E or rearend?

I have an 01 T/A with an LS1/4L60E/10 bolt combo. I am having a rather weird problem with it. It all started with the torque management not working. It would shift hard on the 1-2 shift under power and make a metal sounding squeak. I had the fluid flushed including the cooler lines, and the filter changed. Everything was ok for about 3k miles, then it started again. This time it brought another problem with it. During down shifting into any gear, I get a thunk sound from what seems to be the rear of the vehicle. It also seems to hop up a little. If I lock the trans into a gear and nail it there is no noise. There seems to be very little play in the drive train, and no excessive suspension movement. The bar connecting the tail shaft to the rear end is not broken. The thunk sound is becoming increasingly easier to produce. It started happening at 3/4 throttle, now it happens at 1/4 throttle or less. I never got a code from the computer or any lights. The trans is burning the fluid and was black at the time of the change. I have put 10k miles on it since the change, and the fluid is still red and the correct level, but it definatly has a burnt smell. Sorry about the novel, but i figured too much info is better than not enough.

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Old 10-19-2007, 06:41 PM
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Update: I took it to a transmission shop today, and they kept it for a few hours. The only thing they found was broken rubber in the mounts for the transmission tail shaft and the arm that connects to the rear end. Somehow the car magically stopped shifting hard. There were no codes in the computer, and no evidence of hard shifting, so it was kinda dismissed. I took the guy at the shop for a ride, and showed him the sound during the 1-2 shift. I could hear the sound the trans made, but due to the exhaust being loud, he couldn't hear it. Now that I know about the broken mounts, the thunk sound doesn't bother me as much, but the metallic squeak still does. How do I go about either showing the mechanic the sound or fixing it myself?
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