I have a 1994 Chevy Silverado, 4.3l V-6 with 4L60E transmission. I bought the truck with 84k miles on it. There was a noise and a problem with the transmission I didn't notice until I had purchased the truck. The transmission wouldn't shift into 1st after a stop until I started to accelerate.
The noise I encountered was the crankshaft thrust bearing. There was .070 fore and aft movement in the crankshaft. The transmission would not want to shift out of 1st into 2nd for about 3/8 mile, then it would shift extremely hard for the next 3/8 mile, then shift normally after that (except for trying to go from a dead stop from 2nd, without going to 1st until I started to accelerate, then it would shift into 1st and bark the tires.) I have reserched some on the internet, and found out that the problem with the crankshaft thrust bearing is most likely caused by the transmission pressure being too high in the torque converter causing excessive force to be applied against the crankshaft thrust bearings.
I haven't been able to find out any information on the cause of the problems in the transmission or it they are related, but it seems logical that there is a relationship. I have replaced the transmission shift solenoids, but there has been no change in the malfunction. There are no codes stored in the computer.
This is going to cost me a transmission rebuild, and a crankshaft replacement in the motor. Probably well over 2k at a dealer. I am handicapped and this is a lot of money for me.
