There may be a problem with the Electronic Gearshift Selection brain. The 4HP22EH tranny is a good transmission and your problem might be software related or just a tired tranny. At 280k miles, you definitely got your moneys worth from that tranny, most of them dont make it to 200k without needing to be rebuilt. So to start, check the condition of the fluid and be sure it has the correct amount of fluid, dont rev the motor too much in park, it can damage the "A" pack and then you wont go anywhere. The next thing is to drop the pan and inspect for debris clinging to the magnets and install a new filter. Let me know what you find.
Wednesday, April 1st, 2009 AT 1:11 PM